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Volume 40 (1971)
- Issue 4 Pages 403-
- Issue 3 Pages 241-
- Issue 2 Pages 115-
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Volume 40, Issue 2
Displaying 1-18 of 18 articles from this issue
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Hiroshi SUGE1971 Volume 40 Issue 2 Pages 115-119
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Konoe SATO1971 Volume 40 Issue 2 Pages 120-126
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSPropagated plants of a clone of "Du Puits" alfalfa were grown for six weeks under combined environments of three photoperiods (8 hr, 12 hr and 16 hr) and four temperature regimes (30°C day 25°C night, 25-20, 20-15, ahd 15-10°C). 1) Long day and warmer temperatures promoted elongation of shoot with longer mean internode and with upright growth habit. Leaf expansion rate increased with increased temperature, but branching ability (b)/c)) decreased as temperature increased, except under long day where it was little affected by temperature (table 1). 2) Under 16hr photoperiod flowering was decreased as temperature decreased, although no flower opened at both 20-15°C and 15-10°C. Under 12 hr photoperiod only one of 5 plants flowered at 30-25°C, none at other temperatures. Under short day no plant formed flower bud at any temperature (table 2). 3) Dry weights of tops, roots and total plant were a little affected by photoperiod. Production of tops increased a little as temperature raised except at 30-25°C where it decreased. Roots weight, on the contrary, increased with decrease of temperature except at 15-10°C where it was small. The weight of whole plant was greatest at 25-20°C, followed by 20-15°C, 30-25°C, then by 15-10°C (fig. 4, 5). 4) Leaf/stem ratio and root/total ratio increased under shorter photoperiods and lower temperatures, while dry matter production of whole plant was little affected by daylength (tab1e 3). Nodule weight per unit top weight increased with decrease of daylength and temmperature, and that per unit root weight also increased with decrease of temperature (fig. 1). 5) Crude protein concentration (CP) of tops increased with decrease of temperature, being little effected by photoperiod. CP of roots and TAC concentration (TAC) of all plant parts were variable under longer photoperiods probably due to difference of plant in matulity stage caused by differential temperatures. Under shortday condition, however, TAC of all parts increased with decrease of temperature (fig. 2). Alcohol-soluble non-protein N % and its ratio to total N% were lower under 16 hr photoperiod as compared with those of shorter daylengths, being increased with decrease of temperature (table 4). 6) It may be a significant fact in view of the regrowth after cutting that plants receiving short days and cooler temperatures accumulated relatively greater amount of TAC and CP in the roots than did plants under longer daylength and higher temperatures (fig. 3, 4).View full abstractDownload PDF (770K) -
Hiroshi SUGE1971 Volume 40 Issue 2 Pages 127-131
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Katsumi INADA, Masako YAMAKI1971 Volume 40 Issue 2 Pages 132-140
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSOn the property of mulch films which are effective to either soil temperature raising or weed control, several studies were made from the viewpoint of transmissrion spectrum of film and wavelength dependence of weed growth. A clear polyethylene film was very effective to raise the soil temperature but allowed a thick growth of weeds, while a black one which stained with carbon powder was almost opaque to solar radiation and the effects were just the opposit direction of the clear one (tables 1, 2 & 4). For the purpose of obtaining the more effective film, colored films were investigated. It was observed that the germination and growth of weeds were most inhibited under green light illumination as compared with the other colored lights (fig.2). This suggests that a specific green colored film can be used for the above purpose. Two types of green colored polyethylene film (fig.3), which transmits green and infrared regions, were then tested to presume the both effects of soil temperature raising and weed control. Under the mulch condition, the green films resulted in the maximum soil temperature as high as that of the clear one(fig. 4 & table2), irrespective of a considerable difference among the solar radiation transmission of their films (table 1). It may be due to the fact that water drops adhered to the inside of film were much less in the colored film mulches than in the colorless one under solar radiation (table 3 & fig.5), because the lower the transmission of film by pigmenation, the higher the film temperature by absorbing the radiation energy becomes(fig.6). The growth of weeds was remarkably suppressed by covering with the deeper green film (G) which sufficiently stopped the transmission in blue and red regions (table 4). Thus, it was concluded that green-and near infrared-transparent films like G would be of effective to both soil temperature raising and weed control when they were used for mulching.View full abstractDownload PDF (1058K) -
Eizo MEDA1971 Volume 40 Issue 2 Pages 141-149
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Shoshin KONNO1971 Volume 40 Issue 2 Pages 150-160
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Eizo MEDA1971 Volume 40 Issue 2 Pages 161-163
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Takayuki TANAKA, Seizo MATSUSHIMA1971 Volume 40 Issue 2 Pages 164-169
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSUsing the same apparatus as in the previous paper (XCIV) and using the leaves with four different levels in the nitrogen content as well as in the thickness of leaves, the authors studied the effect of nitrogen content and thickness of leaves on the light-curve of carbon assimilation of the obverse, the reverse and both sides of a leaf-blade. The main results can be summerized as follows. 1) In the case of the obverse of a leaf-blade (flag-leaf) being exposed to light and its reverse being kept in the dark, a leaf-blade with a high nitrogen content or a thick histological construction absorbes much larger amount of CO2 on the obverse than on the reverse at any light intensity, and a remarkable difference in C02 absorption between two sides is always found, while, as the nitrogen content or the thickness, of leaves decreases, the CO2 absorption on the overse goes on decreasing and at the same time, on the contrary, that on the reverse goes on increasing progressively, and as a result the difference in CO2 absorption between two sides comes to be less and lees, and finally no difference comes to be found at any light intensity. 2) A comparison in the total amount of absorbed CO2 on the two sides of a leaf-blade has been made between two cases under the condition of the total amount of light on the two sides being always equal with each other case; i. e. one is the case of the obverse being exposed to light and the reverse being kept in the dark (herinafter written as one side exposure) and the other is the case of both sides being exposed to light with a half light intensity (hereinafter written as two side exposure). The results are as follows. The leaf-blades with a high nitrogen content or thick leaf-blades absorbes much larger amount of CO2 in the case of two side exposure than in the case of one side exposure, and they never show any light-saturation phenomenon up to the light intensity of O.8cal/cm2/min.in the case of one side exposure, while they clearly show a light-saturation phenomenon at the light intensity of O.6∼0.7cal/cm2/min. in the case of two side exposure. However, as the nitrogen content or the thickness in leaves decreases, the light-saturation point starts descending in the case of two side exposure and it also starts appearing even in the case of orLe side exposure, and the difference in CO2 absorption at every light intensity between two cases comes to be less and less and, as a result of it, finally the light-curves of C02 absorption in two cases come to coincide with each other. 3) The differences in the light-curves of CO2 absorption due to different nitrogen levels or thicknesses in leaves can be ascribed to the differences in light-absorption and light-transmission in leaves. 4) The results in the present experiments strotigly suggest the importance of straight and errect leaves, both sides of which are apt to receive sunlight under natural conditions, for increasing the rate of carbon assimilation and consequently the grain yield.View full abstractDownload PDF (830K) -
Kazuo NAGATO, Norimasa YAMADA, Fateg Muhammad CHAUDHRY1971 Volume 40 Issue 2 Pages 170-177
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSGenerally in indicas, compared with japonicas the carbohydrates concent in plant is less at heading time, number of spikelets per panicle is more, ripening period is short, therefore, competiton for absorbing carbohydrates among kernels on panicle is very severe and inferior kernels become sterile, abortive and opaque easily. By top dressiag in indicas carbohydrates content at heading stage decreases and number of spikelets per panicle, especially on secondry branches increases, then the competition among kernels becomes more severe causing the inferior kernels stop their growth and bdcome sterile, abortive and opaque kernels. More over grain weight of normal kernel is also decreased. In japonicas, carbohydrates content scarcely decreases and increase in number of flowers per panicle is small, which causes the ripening slightly deteriorate, and on the other hand the grain weight shows a slight increase. As a result in two varieties of japonica, grain yield per panicle is increased. Grain yield of Dular remains unchanged, where as, a slight decrease and rather decrease is obtained in case of Bluebonent and Te-Tep respectively. Karalath, which is thought a most unadaptable variety to heavy manuring decreases to 84%. Moreover, by heavy manuring, increase of panicles per plant is conslderable in japonicas, but it is small in indicas, so heavy manuring obviously causes increase of the yields in japo-nicas and scarcely increases rather decreases in indica varieties. In the light of these points it could be recommended that increase of yields can be obtained with the additional nitrogen fertilizer, when depending upon the nitrogen application the number of panicles per plant is increased and the flowers per panicle, particulary the flowers of secondary branches are kept almost constant. In varieties having such characteristics, the ripening does not deteriorate and high yields of good quality are expected. (Kinmaze and Towada) Besides this, with high nitrogen when panicle increases in size, branches in(:rease in number but the number of flowers on secondary branches does not increase or increase nominally the ripening is not severely worsened. This characteristic is also suitable for heavy manuring. This trend is observed in Bluebonnet.View full abstractDownload PDF (943K) -
Jun INOUE, Katsuhiko HIBINO, Kenji ITO1971 Volume 40 Issue 2 Pages 178-182
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
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Kazuo HONJYO1971 Volume 40 Issue 2 Pages 183-189
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIn order to clarify protein content variation of the rice varieties and the relation between protein content and environmental factors, some investigations were carried out as follows. To clarify the variation of protein content of rice varieties, 33 varieties of Hokkaido and Tohoku district were planted in the same paddy field for 7 years from 1963 to 1969 and protein content in their rice grains were compared yearly. As to the influences of the environmental factors, rice crops were grown during their ripening stage under high (25-27°C) air temperature, high (30°C) or low (17°C) water temperature, and sunshading, protein content of their rice grains were compared for 2 years of 1968 and 1969. The results are summarized as follows. Protein % in rice grains is respectably differing with rice varieties. In general, earlier ripening varieties tend to show higher % than the later one. Most varieties of Hokkaido belong to the earlier ripening group and showed higher % than most varieties of Tohoku district. In each district, Norin No.20 of Hokkaido and Oirase of Tohoku district were remarkably higher % than the other varieties yearly for 7 years, so it seems that they have somewhat super hereditary natures refering to accumulation of protein. Protein % of the same variety that was planted on the fixed plan differed year by year. This fact shows that protein content is influenced by the weather condition of each year. From the results of some experiments refering to weather environments, it was cleared that protein % of rice grains is increased by high air temperature or high water temperature as well as decreased by low water temperature or sunshading during their ripening stage.View full abstractDownload PDF (899K) -
Kazuo HONJYO1971 Volume 40 Issue 2 Pages 190-196
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTo prove the effects of the fertilization on protein content of paddy rice, the present experiments were carried out as follows. (1) Planting density was altered as 5O, 80, 110 or 140 hills/3.3m2, and the levels of basaldressing applied were 0.56, 0.75, 0.94 or 1.13kgN/are. The amounts of phosphatic and potassic fertilizer were normally fertilized. (2) In addition to basal dressing, top dressing of 0.05∼0.25g N/hill were applied on various stage before or after heading stage. (3) Two kinds of N, P and K fertilizer experiment paddy fields were used, the one is the usual field continued 12 years for the experiment and the other is newly opened field for the experiment. The results are summarized as follows. 1. As to associated effects of planting density and nitrogen supply on protein content (%) and protein production (protein % × grain yield), it was observed that the more nitrogenous fertilizer applied and the more spacing was wide, the more protein % in rice grain was increased. Ultimately, protein % depends on nitrogen supply per hill. Protein production also tended to increase in higher levels of nitrogenous fertilizer in any planting density, but it was hardly influenced by planting density in any nitrogen levels. 2. The most effective stage of top dressing of nitrogenous fertilizer on the protein % is the heading stage. Before heading stage the effect was slight. After heading stage, the effective period keep on decently long time but the effect make a slow descent gradually. The more nitrogenous fertilizer applied, as top dressing the more protein % was increased and it was more effect to apply all amount of it at the nearer stage to heading date. Top dressing of 0.25g N/hill at the heading stage increased protein content by 38% compared with non top dessing. 3. As to the protein content in rice grain of each plot in N, P and K fertilizer experiment field, in case of usual paddy field, protein % was most high in N P K plot and was inferior any other plots that were excepted each nutrient element. On the other hand, in case of new paddy field with great P-absorptive coefficient, non-application plots of phosphatic fertilizer increased percent of protein by 20-30%compared with N P K plots, but these plots were accompanied remarkably by the decrease in grain yield, consequently reduced the total protein production per unit area.View full abstractDownload PDF (910K) -
Takafumi HOSHINO, Seizo MATSUSHIMA, Toyoo TOMITA1971 Volume 40 Issue 2 Pages 197-202
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSCombining 6 different temperature conditions (2 different air-temperatures × 3 different water-temperatures) with 6 different fertilizing conditions (3 different levels of fertilizer × 2 different fertilizing soil depths) as shown in Table 1, the authors set up 36 treatments and grew the rice seedlings for 30 days and examined the temperature and fertilizing effects on the growth and characteristics of seedlings. The results obtained can be summarized as follows, 1. The plant age (expressed by the number of leaves on the main stem) is much influenced by the water-temperature, and the higher the temperature is the more the plant age advances but the plant age is also influenced to some extent by the fertilizing conditions such as the amount of nitrogen. 2. The plant height, the weight of top dry-matter and foot dry-matter and the ratio of top dry-matter to the plant height (top/plant height ratio) increase all with the increasing amount of nitrogen as well as the increasing concentration of nitrogen in soil under low air and water- temperatures, while as the temperature raised the ill-effects of large amount of nitrogen on the growth of seedlings begin to appear, and as a result of it, under high temperature conditions it is necessary to decrease the amount of nitrogen as well as the concentration of nitrogen in soil for the favourable growth of rice seedlings. 3. The nitrogen content in rice seedlings is much more influenced by the fertilizing conditions than by temperature conditions, and the nitrogen content is almost parallel to the amount of nitrogen applied. 4. The carbohydrate (total sugar-Estarch) content in rice seedlings is very high in both the highest and the lowest temperature condition in the present experiment and it is very low at the treatment of 26°C in water-temperarature, and it decreases with the increasing amount of nitrogen applied, except for the treatrnent of 36°C in water-temperature. 5. The ratio of carbohydrate to nitrogen (C/N ratio) in rice seedlings is much more influenced by fertilizing conditions than by temperature conditions, and the ratio decreases progressively with the increasing amount of nitrogen applied at any temperature condition.View full abstractDownload PDF (792K) -
Hisao EGUCHI, Jusuke HIRANO1971 Volume 40 Issue 2 Pages 203-208
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIn this experiment, four plots which were combined non-tillage and tillage in autumm and spring were prepared as follows; non-tillage in autumn and spring (Nt-Nt), non-tillage in autumn and tillage in spring (Nt-T), tillage in autumn and non-tillage in spring (T-Nt), and tillage in autumn and spring (T-T). The experiments were continuously conducted from wheat in 1964 to rice in 1968. Soil of this paddy field was fluvio-marine soil (CL), and wheat variety used was Shirasagikomugi. The wheat yield of non-tillage plot (Nt-Nt) was fairly decreased in first year, and was recovered in and after second year. In plots (Nt-T and T-Nt), where non-tillage and tillage were combined, more yields were produced than those in plots(Nt-Nt and T-T) where non-tillage or tillage was continued. The amounts of wheat growth were smaller atearly growth stage and were larger at late stage in the plots of non-tillage in autumn (Nt-T and Nt-Nt)than those in plots of tillage in autumn (T-Nt and T-T). The macro pore ratio (air ratio at pF-1.5) at plow layer in non-tillage plot (Nt-Nt) was considerably decreased in first year, and was hardly changed in subsequent years. It was presumed that the decreasing of macro pore ratio in first year was due to the condition of field puddled at transplanting culture of rice before initiation of non-tillage continuation. The macro pore ratios at lower part of plow layer and at subsoil layer were higher in plots combined non-tillage and tillage (Nt-T and T-Nt) than in plots continued non-tillage or tillage (Nt-Nt and T-T). And those macro pore ratios were closely correlated with yield. It was considered from results obtained that wheat cultivation, in which non-tillage and tillage were combined in rice-wheat cropping, contributed to formation of the suitable soil conditions for root development and resulted to increase yield. It was also assumed that the continuation of non-tillage for several years did not decrease yield.View full abstractDownload PDF (775K) -
Yoshiro TATEMICHI, Masae ONO1971 Volume 40 Issue 2 Pages 209-216
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSTo make clear the metabolic changes which are concerened with the promortion of growth by the rise of soil temperature, following experiments were carried out. Tobacco plants for the experiment were grown for two weeks in the culture solution of a high (35°C) and a low (15°C) temperature, respectively. Within the limits of these temperatures the physhiological responses of the plant to nutrient uptake and translocation ascend, as a rule, in accord with the rise of solution temperature. Air temperature was kept at 15°C in the day-time and at l0°C at night under the artificial light condition. Physiological activities both in the leaf and root were examined in reference to the 14°C metabolism. The results obtained were as follows : 1. The growth of seedlings grown at the low solution temperature, was far less than that grown at the high solution temperature, on account of low chlorophyll content and low photo-synthetic rate. 2. The root grown at the low solution temperature was thicker and had more secondary roots in comparison with that grown at the high solution temperature. 3. As to the activities, as expressed by <32>P uptake and <14>CO2 exhaust from <14>C-organic acids, the apical part of roots was higher than the basal part, being common to both solution temperatures. The activities of the root grown at high solution temperature exceeded those of the root grown at the low one, when the activities were examined by keeping it at each temperature to which the root had been exposed. It might be stressed, however, that the root grown at the low solution temperature revealed high activities, in case both kinds of roots were kept at the same temperature (30°C). Thus it was suggested that the root grown at the low solution temperature of the culture solution, was supressed in spite of their having high physiologiclal capacity. 4. Toknow the metabolism of photosynthates, <14>C distribution was traced 6 hours after one hour's feeding. The <14>C uptake by the leaf and its translocation into the root was higher in the same plant. 5. With respect to sugar metabolism, the contents of sugar, especially glucose and fructose in the leaf and root of plants grown at the high solution temperature were less, and the <14>C specific activities were also lower. These facts showed that at the high solution temperature the metabolism of sugar as accelerated both in the leaf and root, and hence the <14>C incorporation into cationic frabtion and ethanol insoluble fraction became larger. 6. From the facts that in the root grown at the high solution temperature, the sugar content, <14>C specific activity and resbiration rate were lower, and adversely the peroxidase activity was higher, as compared with that grown at the low solution temperature, it was inferred that the decrement and aging of the root might be accelerated by high temperature around it.View full abstractDownload PDF (1006K) -
Jong Hoon LEE, Yasuo OTA1971 Volume 40 Issue 2 Pages 217-222
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSSome relationships between the physiological and morphological characteristics of aerial parts in rice plants differing in plant type and other genetic characters, and root systems and root activities were presented in the previous papers (I to IV). In this study, a single variety, Nihonbare was used in order to find out effects of nitrogen level and placing position of the fertilizer on the chracteristics of root and aerial parts.The results obtained could be summarized as follows, (1) It was found that development and elongation of new roots were greatly retarded immediately after transplanting, when a higher level of nitrogen was applied as a basal-ferti-lizer. Therefore, a special caution should be paid to accelerate new root development through application of the optimum nitrogen amounts. (2) An excessive tillering of rice plants was observed at the stage of the maximum number of tillers, when a greater amount of nitrogen was applied as a basal-dressed fertilizer.This tendency was more pronounced as th amount of the upper roots was greater and the root activities were more active. However, the activities after this stage suddenly decreased, resulting in production of numerous invalid tillers. (3) On the other hand, the high root activity was maintained throughout the growth period, when the optimum amount of nitrogen as a basal-fertilizer was applied to deep-layer or to all the soil layers. As a results, a higher percentage of valid tillers was obtained in this case. (4) When the proper lelvel of nitrogen as a basal-feritilzer was applied to deep-layer and the whole layers, the activities of the total roots especially the lower nodal ones were active at the heading and ripening stages as compared with the activites in case of nitrogen, application to surface layer soil. The higher the lower-nodal root activity, the more chlorophyll was contained in the leaf and the slower destruction of chlorophyll in the leaf blade was taken place. It seemed very true that the higher yield was directly attributed to these relationships in case of nitrogen application to either deep-layer or the whole soil layers.View full abstractDownload PDF (651K) -
Masaki HORIE, Sumio MASUDA, Iwao YAMAMURA, Kazumi KAWAGUCHI, Toshio HO ...1971 Volume 40 Issue 2 Pages 223-229
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIt is considered that the varieties of every crop plant consist of a population of many-individuals (hills) cultured on a widespread farm under given conditions. As a result, when a variety is observed as a population of many individual plants, the individual plants comprised in a population vary widely with one another, and that the individual variations are subject to wider when they are cultured under different conditions. From such reasons, it could not be regarded as a satisfactory indicator of the characteristics of a variety to show the characteristics of each variety merely by the mean value of characters of crop plants. It would be rather a better indicator to show the variations among the characters of individuals in a population together with these mean values. From such viewpoint, the authors, in order to ftnd the first clue for observing the crop varieties as a population of individual plants, devised to use the coefficients of variation found among individual plants of characters of paddy rice and two-rowed barley varieties, as an index to the variations found among the population, and the authors examined the relationship among the estimator of tlle coefticients of variation of the individual characters and the relationship of the estimators to the planting density. The comparison of the estimators of the coefficients of variation between paddy rice and two-rowed barley plants showed that the estimators of two-rowed barley plants were always larger than those of paddy rice plants, without any exception. When viewed from the relationship of the estimators of coefficients of variation to the planting densitry, two groups of different chardcters were observed among those sample varieties: (a) the characters which bring about changes in the avelage of estimator; and (b) the characters which britig about little or no changes in the average of estimator. And it was proved that in the former case, the range of the distribution of the estimators of all the varieties changed in accordance with the changes in the average of estimator, but in the latter case, little or no changes took place in, the range of the distribution of the estimators. Regarding the effect on the estimators of coefftcients of variation caused by the planting density under review, both the average of estimator and the range of estimator distribution of all paddy rice varieties showed a tendency to become smaller according as the rate of planting density has become lower. In the case of two-rowed barley varieties, however, the average of estimator and the range of estimator distribution became smaller up to a certain extent of sparse planting, but both the average of estimator and the range of estinlator distribution tended to become larger when planted more sparsely.View full abstractDownload PDF (947K) -
Masaki HORIE, Kimito MIKOSHIBA, Hideo OGIWARA1971 Volume 40 Issue 2 Pages 230-236
Published: June 28, 1971
Released on J-STAGE: February 14, 2008
JOURNAL FREE ACCESSIn succession to the preceding paper IX, the authors, in order to find a clue for observing the crop varieties as a population of individual crop plants, took up the coefficients of variation of the characters of individual plants of soybean varieties, and examineed the relationship among the estimators of coefficients of variation of individual charabtors as well as the relationship of the estimators to the planting density. Though it is not possible to compare the test results of soybean plants directly with those of paddy rice and two-rowed barley plants cited in the preceding paper, it can safely be said that the estimators of coefficients of variation of the characters of individual soybean plants are in general larger than those of paddy rice and two-rowed barley plants. Connected with the estimators of coefficients of variation of the respective chalacters of individual soybean plants, it can be said that in the case of the characters related to the stem height is the smallest in general, followed by the case of the characters related to the yield, and the estimator of coefficients of variation is the largest in the case of the characters related to the branchings. According to the average of estimator of coefficients of variation and the range of estimator distribution of all the sample varieties, and according to the relationship of these average of estimators of coefficients of variation and the range of estimator distribution to the planting density, the 24 characters observed here can be divided into 5 character groups.View full abstractDownload PDF (909K)
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