日本作物学会紀事
Online ISSN : 1349-0990
Print ISSN : 0011-1848
ISSN-L : 0011-1848
24 巻, 1 号
選択された号の論文の16件中1~16を表示しています
  • 田村 猛, 船戸 忠寿, 岡本 憲三郎, 白石 英次, 関口 〓
    1955 年 24 巻 1 号 p. 1-3
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    A newly devised apparatus for measuring the resisting power of rice seedlings during the uprooting operation in the seed bed are described. According to the results of measurements by means of the device, following facts were elucidated: The thinner the seeds were sown, the larger was the resistance of seedlings. On the other hand, the thinner the seeds were sown, the smaller was the resistance per unit area of seed bed. Thinner sowing, however, requires larger areas of seed bed per unit area of the main field, and so a larger energy for pulling up the seedlings are required finally. The higher the specific gravity of seed grains, the larger was the resistance. The following equations were obtained from the experimental data (X, representing specific gravity) y=1313.3+23.1x for 40 days seedling y=1593.3+41.6x for 45 days seedling Amount of fertilizer used had a great influence on the resistance power, remarkahle differences due to the amount of fertilizer applied being already recognized on the 15th day after sowing. And, the differences became progressively large according to the number of days elapsing. But, no difference was found between the plots 1.5 times and those 2.0 times the ordinary quantity of fertizer applied. Consequently, resistance ofseedling for pulling up is considered to show the degree of health of seedling when they are grown under same environmental conditions. And, remarkable differences in the resisting power in accordance with the quantities of fertilizer applied could be oserved just after 15 days of sowing. These differences increased according to the number of days. But no great differences were found between the plot fertilized with 1.5 times the amount of the standard and that with 2.0 times the amount. So it should be understood that the resistane power of seedlings against uprooting is more closely connected with the degree of growth of the plant, grown under the similar environmental conditions.
  • 浦野 啓司
    1955 年 24 巻 1 号 p. 4-7
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    For the purpose of investigating the method of determining the affinity among corn strains, the experiments were carried out from 1952 to 1953 using each 3 to 5 inbred lines raised from three varieties. A 5 gr. lot of pollen of each inbred line was extracted by boiling it in 50 cc of the physiological solution (0.85% NaCl), and the filtrate was used as the antigen. The antiserum was prepared through 2 rabbits for each inbred line. Between the inbred lines A and B, which had been separated comparatively earlier in generation i.e. each being S10, an obvious precipitine reaction was obtained ; while by the line C separated form S3 to S5 generations deriving from the same source as A or B lines its precipitine reaction with the line A or B was similarly marked but not so decidedly as by the former case.
  • 浦野 啓司, 小田切 弘一
    1955 年 24 巻 1 号 p. 7-8
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    To find protein constituents by precipitin reaction, fraction analysis of each antigen solution which extracted from pollen of inbred corn was tried by SAITO-KIKKAWA's method. The results of experiment are as follows : (1) Most of the protein tested were constituted with albumin and α-globulin. (2) It was found that the difference both in albumin and in α-globulin fractions were evident among inbred lines. (3) A close relation was observed between precipitie reaction and the specificity of protein constituents.
  • 森本 勇
    1955 年 24 巻 1 号 p. 9-11
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    1. The author caluclated long-term yield standards of paddy rice, upland rice, barley, wheat, soybean, and azuki bean in Aomori, Iwate, Akita, Miyagi, Yamagata, Fukushima, Niigata, Tochigi, kyoto and Wakayama Prefectural Agricultural Experiment Stations, considering these values as the indices of soil productivity for these crops. 2. He discussed, depending on these data the problem of the under-estimation of crop yields by the Official Agricultural Statistics. 3. The variation curves of the actual yield of these individual crop were examined. 4. He made a σ-analysis of the yield in these individual crops, and discussed the contributions of the variety factors, the year factors and the locality factors in defining the yield of the crop.
  • 川竹 基弘
    1955 年 24 巻 1 号 p. 12-15
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    Anatomical studies were carried out upon the vascular differentiation in leguminous plants. Thirteen species were used as material in the present study. They were sown in seed-boxes filled with sandy loam at the seasons favorable for the growth of individual species. Serial free-hand sections were stained with 0.5∼1 per cent fuchsin solution. The results were as follows : (with a text figure) (1) With regard to the root xylem, eight of the species investigated were of triarch and the other five were of tetrarch. In general, the transition region between root and stem was commonly very short, but in all the triarchy plants and Vicia Faba, this region were found to extend to the first or to the third, or even to the fourth nodes above the cotyledons. And it was of interest that all the triarchy plants were found belonging to the hypogaeous group. On the other hand, the vascular transition in the tetrarchy species, excluding V. Faba, occured in the hypocotyl. (2) In those nine species, namely, eight triarchy and V. Faba there occured no transition in the hypocotyl, but a new vascular bundle were formed by the breaking of the original two xylem strands which had departed from the cylinder as cotyledonary traces. The root xylems in V. Faba proved to be six in number, and two xylems of them were formed by the breaking of the strands of special courses. In tetrarchy plants, the bundles distributing in the region just beneath the cotyledonary node were six and ten in number, but according to the first forking of vascular bundles, these plants are usually classified into two grades, e. g. six and eight. (3) The traces supplying a single cotyledon ranged in number from one to two, and they were associated with breakings or fusions in the stele around and above the point of departure of the trace : One trace among those traces, however, was formed only by the differentiation of triarchy plants, but the other plants pocessed two traces. Thus the number of the cotyledonary traces in the hypogaeous plants were found usually less than that in the epigaeous. (4) With regards to first internodal region, nine hypogaeous species were found different in the differentiation and arrangement of vascular tissues from the epigaeous plants. At the part just above the cotyledonary node, two cortical bundles separated from the cotyledonary trace, and developed into the lateral leaf trace or into the stipular trace, through one or more internodes. And within a short time, two fiber strands projected from the distal parts of the stele. The strand supplying the median trace of petiole and the axillary bud was derived from this strand at each sides. The vascular bundles in the stele ranged from two to eight in number. (5) In the nine species, there were observed two developmental phases of leaf on stem. V.hirsuta, V.tetrasperma, V.Faba and P.sativum were found to have a foliage leaf on the third node, while the other five species had it on the fourth node. on the other hand, the foliage leaf of tetrachy plants was observed even on the first node, similar to most epigaeous plants. (6) The differentiation of xylems and fiber strands in the cortical layer associated with the number of leaf trace. In general, the cortical strands run out from the main axis, between the second and the fourth node to foliage tissues. And it was found that the disappearance of these vascular component from the cortical layer were closely related to the transition of bundles in the stele. (7) The mode of differentiation of vascular bundles at the second or following internode and nodal region in the four tetrarahy plants was very similar to that after the vascular transition in the triachy species. (8) From the facts above mentioned, it is clear that, there are various types of differentiation, but the differentiation is concerned with the morphological characters of the species, and also some hypogaeous leguminous plants have a systematical differentiation of vascular bundles.
  • 渋谷 常紀, 佐藤 久二, 鈴木 正行
    1955 年 24 巻 1 号 p. 16-19
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    One-seeded fruit of peanut (Fig. 2) is induced by the abortion of one of two ovules due to fertilization failure (Fig. 3). So far as the varieties used in this investigation are concerned, the abortion exceeded slightly at the upper ovule over that at the lower one and was about 8∼10% in sum in the case of normal flower, whereas a greater frequent occurrence of abortion was found at the lower ovule and resulted in one-seeded fruit of 15∼20% as total (Table 2, 3) in the case of underground flowers (Fig. 1). Besides the one ovule abortion, the underground flower contains also a tremendously high rate of non-fertilization of two ovules involved, inducing the failure of gynophore formation (Table 5) Such total damage of two ovules was caused by the extreme scarcity of pollen-set on stigma as well as the imperfect elongation of style retaining the stigma within staminai tube (Table 6). The above-mentioned behavior performed by underground flowers may be explained from their special surroundings and the abnormal flower structure.
  • 菅野 考己, 米元 孝一, 五島 康
    1955 年 24 巻 1 号 p. 20-26
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    In order to find out the essential causes of shrinking and failing in ripening of rape plants, the authors carried out experiments during 1951 to 1953 on the fields where such injuries prevailed. The results were as follows : 1. Some differences in resistance to the injury were found among the varieties tested. 2. It might be presumed that the nursery conditions had a great influence upon the out-break of the injury ; those factors causing the acceleration of seedling growth, the decrease in the percentage of dry weight of plant body and the rise in the top-root ratio, might have been liable to promote the injury. 3. No relation has been noticed between aphis and the injury, and the occurence of injury might be influenced rather by the seedling chracters and by the field conditions. 4. Generally, such injuries were controlled by early sowing and transplanting, while in late culture the injury was increased. But the time of transplanting had larger influences on the injury than the sowing time. 5. It might be presumed, that nitrogen, potash and phosphorus promoted the injuries, especially the failure in ripening in the respective order according to the grade of acceleration of plant growth. 6. The application of compost and wood ash was very effective to keep out the plants from the injury, especially the application of wood ash in the fields being most effective, and also the application of ash in the nursery bed being beneficial to some extent. 7. Application of boron added in the basic fertilizer, or as top-dressing or by spraying on the plant was very much effective to control the injury. 8. It may be concluded from the results above mentioned, that a greater part of the cause of the injury should be the boron-deficiency in the plant, the latter being directly or indirectly affected by growth conditions. The beneficial effects of compost and wood ash might be ascribed to the presence of boron in those fertilizers.
  • 堀田 良, 藤塚 昭吾
    1955 年 24 巻 1 号 p. 27-28
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    For the purpose of maintaining the hereditary characters, the experiments regarding the vegetative propagation were carried out from 1952 to 1954, using the rape-plant variety "Hamburg, " Generally, propagation methods can be divided as follows; (A) Allowing the vegetative development to continue from the end of December to April in green house, at temperatures 20°∼25°C, (B) Inducing the vegetative development again after the reproductive phase by (1) pinching axillary buds in spring (2) repeating pinching operation in flowers everyday or (3) topping the stem. Among those method (B)-(2) was found most usefull. By this method, leaf buds appeared from the axile of top parts in the middle of August. Such new leaf buds were used successfully for propagation by cutting. The buds on the middle to lower parts of the stem should be used. The temperature for cutting propagation. was found necessary to be kept at 20°C or higher, and the plant hormone "Ruton" should be used for good rooting.
  • 馬場 赳
    1955 年 24 巻 1 号 p. 29-33
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    The author made a study on the effect of transpiration upon the silicification of epidermal cells of leaf blade using rice plants grown up under various environmental conditions. The rate of transpiration from leaf surface was determined by cobalt chloride paper method. From the results obtained it was concluded that such treatments as shading, partial removal of root system or lowering the soil moisture, each tending to suppress transpiration, retards the upward translocation of absorbed silica in plant, and reduces the accumulation of silica in the epidermal cells of leaf blade, while, on the contrary, such a treatment as blowing the plant body with an electric fan which will accelerate transpiration promotes the translocation of silica, increasing its accumulation in leaf blade. It was also found that the plant which has passed its seedling stage on a dry seed-bed has lower ability to transpire, and that consequently the translocation of silica is slower and also the accumulation of silica in the epidermal cells of its leaf blade is less in such a plant as compaired with those in the plant grown on an ordinary wet seed-bed.
  • 武田 友四郎, 丸田 宏
    1955 年 24 巻 1 号 p. 34-40
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    In the previous paper the authors have discussed that the rice plants after transplanting have got different demands for light in order to have their maximum photosynthetic capacity accompanying with their different growing stage, and this differences of demand for light by the plants was due to the differences in conditions of receiving the light, which was greatly influenced by the mutual shading rate of leaves. It is quite clear that the spacing differences of seedlings in the nursery bed is remarkably different from that of the plants after transplanting, therefore, in this paper authors have tried to clear the relationship between the spacing of seedlings and the demands for light by the seedlings. The effect of light intensity on the photosynthetic rate of seedlings in different spacing, that is thin, intermediate and thick, and also in the different growing stages of the plant was measured by the aparatus described in the previous paper. The results obtained were as follows: 1) At the early stage of growth (4.1 leaf stage) the demands for light by the plants for their maximum photosynthetic rate are comparatively low, and the saturation points lie under 30, 50 and 80 k. Lux respectively. 2) With the progress of growth, the demands for light of thick seedlings increase remarkably (Fig.2∼7), and at the 5.2 leaf stage, that is at the middle stage of growth, the saturation point does not exist within the range of below 100 K. Lux (Fig.6); on the othet hand, the demands for light by the intermediate and thin spacing seedlings increase gradually, and at the 7.5∼7.7 leaf stage, that is at final stage, the saturation point of the former lies above 100 K.Lux (Fig.12), and that of the latter lies below 80 K.Lux. 3) Relation between the changes of demands for light and the growth of seedlings in shown is Fig 16. It has been observed that from the 9th August the increasing rate of dry weight of the thick seedlings were less in comparison with that of intermediate and thin seedlings, and from 15th August the increasing rate of dry weight of the intermediate seedlings were less than that of the thin seedlings. 4) At the final stage, the photosynthetic rate of thick seedlings were less than that of intermediate under the light intensities below 80K. Lux (Fig.12). This relation is also shown in Fig.14 and 15. Fig.14 is the growth curve obtained from the seedlings grown under the unfavourable climatic conditions, and the seedlings were effected by the unfavourable climatic conditions especially at the middle and final stage of their growth, and accordind to the obtained figure, it can be said that the increasing rate of dry weight of thick spacing seedlings were less than that of intermediate seedlings. Fig.15 was obtained from the seedlings grown under the favourable climatic conditions, according this figure, it may be said that the increasing rate of dry weight of thick spacing seedlings were equal to that of intermediate seedlings. In conclusion, it can be said that at the middle stage of growth in the nursery bed the thick spacing seedlings have got no saturation point under the natural conditions, on the other hand, thin spacing seedlings have got saturation point till the final stage to come. In intermediate spacing seedlings, which is common in nursery bed in Japan, the saturation point is comparatively low at the early stage, but-with the progress of growth it increased gradually, and finally reached to the state of having no saturation point under natural conditions.
  • 松島 省三, 岡部 俊, 和田 源七
    1955 年 24 巻 1 号 p. 41-47
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    As the plant chamber of the apparatus reported in the previous paper was higher in temperature and in humidity than under natural condition, the authors made an effort to improve the defects by setting up a refrigerator (2.H.p.), resulting in a good success. Using the improved apparatus, they made further experiments and tried to apply the results to the yield-forecast. 1. Relation between the rate of carbon assimilation and light intensity. The relation of light intensity to the rate of carbon assimilation in different growing stages showed as much the same relation as that of the previous paper, as shown in Fig. 1. Light saturating points were found at the intensity of approximately 0.6 cal./cm2./min. in the period before the heading time, and in subsequent period the intensity seemed to begin to fall off day by day, as seen in the former report. In spite of using 6 varieties differing in earliness and in ecotype, varietal differences of saturating light intensity could hardly be seen so far as this experiment was concerned. An there were no clear differences regarding saturating intensity among plants grown in differently fertilized conditions, as shown in Fig. 2. Moreover, even in the conditions differing in spacing and in temperature differences of saturating light intensity could also hardly be distinguished, though the experiments were not enough to ascertain. 2. Diurnal changes of the rate of carbon assimilation. Diurnal changes of the rate of carbon assimilation on fine days were closely resembling to those of the previous paper. From this experiment it was reaffirmed that the stronger light intensity than 0.6 cal./cm2./mln. is of no use for carbon assimilation. Diurnal changes on partly cloudy days or cloudy days were invesigated, as shown in Fig. 3. From these figures it can be drawn out that the assimilating activity holds almost constant in the higher light intensity than the saturating point (0.6 cal.), but it changes almost completely parallel to light intensity in the lower intensity than the saturating one. 3. Seasonal changes of the rate of carbon assimilation. Seasonal change of the carbon assimilation on middle maturing variety (Norin-No. 15) was traced up in 1953-'54, and the results in Fig. 4 were obtained. As the curve of 1953 in Fig. 4 was obtained under the higher condition by 10°C than the normal and the weather of the year was abnormally bad, the curve seemed to be less reliable than that of 1954 as the seasonal change in general. The curve in 1954 shows that maximum rate of photosynthesis as a whole plant occurs at the maximum stage in number of tillers........the stage is aiso the beginning stage of young panicle formation........and the second maximum occurs at heading time, and the former is much higher than the latter. 4. Application to the yield-forecast. From the resuts above mentioned it was made clear that relative amount of carbon assimilation in rice-plants at a given stage can be estimated by measuring light intensity to a considerable extent. Using daily data of sunlight intensity obtained from "Robich solarimeter", covering the period from transplanting time until ripening in 1951-'54 the authors tried to calculate the index of daily relative amount of cabon assimilation and arranged them in mean value for 10 days as written in Table 1. For instance, in the first decade of July in 1951 the relative amount of carbon assimilation is 69.8% as compared with that of the case of complete fine weather. The index of relative amount of carbon assimilation has to be corrected by the differences of the day-length and of the rate of photosynthesis in each decade. Moreover, the inexed at the stage of reduction division and of milk-ripening are necessary to be weighted, because the amounts of carbon assimilation at those two stages have always marked effects upon the yield of rice. [the rest omitted]
  • 茶村 修吾
    1955 年 24 巻 1 号 p. 48-50
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    The purpose of this experiment was to investigate the growth of mint in successive cropping and to find suitable methods of manuring, especially in reference to the soil of granite origin. (1) In ordinary successive cropping, the branch and stalk of mint plants declined in number and the yield of oil accordingly decreased, the tendency being more remarkable by the soil of granite origin. (2) The more acidified the soil in successive cropping, the less yield in oil resulted in the succeeding years compared with that in the first year. The absolute amount of oil yield became richer when the soil was applied with some complementary elements of fertilizer. (3) When it was cultivated yearly under linle-deficient condition, the mint yielded less oil; the soil being acidified and alkali earth metals, alkali metals and other necessary elements being lost steadily with the increase of unfavourable elements such as Al, accumulating in turn. In the case of ammonium sulphate deficiency the oil yied became richer year by year, although less in the absolute amount of production, and the soil remained nearly neutral and every beneficial constituent was richer, and injurious constituents were less remarkable in the soils tested. (4) For successively cropped soil, the cauterized phosphatic fertilizer was much favourable compared with the superphosphate of lime, and rape-seed-oil-cake was found best for yielding of oil; the latter showed, however, a lack of Mn, FeIII, Ca, and K, each being considered necessary to the growth of mint.
  • 菊池 正
    1955 年 24 巻 1 号 p. 51-52
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    1. Experimental plots of mulberry-field were irrigated with ground-water in late spring, and the damages in the plant by frost were examined in comparison with those in control plots unirrigated. 2. Irrigation was begun on April 10, 1954, and was continued thereafter, water being applied into the furrows every three days, in the amount of 30mm in depth for each time. 3. The first test-case of severe frost came on Apri1 21, and the second on April 28. Each night previous to the attacks, forecasted meteorologically, irrigation was intensified, by way of precaution, the depth of water applied being increased to 60 mm. 4. As the results of experiments, the damages in the plots irrigated proved decidedly small compared with those in the control plot unirrigated. 5. In the irrigated plots, the damage was rather severer in higher or younger boughs than in lower ones, while in the unirrigated plot, the relation was found inverse. 6. The rates of injury either in the number of boughs or in that of leaves were considerably larger in the irrigated plots than in the unirrigated plots. 7. The average minimum air temperatures observed at 1m above the ground were 1.6°C. in the irrigated plots, and 0.3°in the unirrigated plot. The initial temperature of the ground water used for irrigation was nearly constant at ca. 15°C.
  • 有門 博樹
    1955 年 24 巻 1 号 p. 53-58
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    A series of experiments was made to find the relationship between the tolerance agaist excess-moisture injury and the development of the ventilating system, through which molecular oxygen should be transported from the top to the roots for the purpose of respiration. Potted plants of barley, Kentucky-31-fecue, alsike clover, and Genge (Astragalus sinicus) were grown in a green-house, and the soils were flooded during periods of various lengths until the time of harvest. The results obtained are as follows: (1) The barley plant, when flooded continuously from the tillering stage of growth to the time of its death, was to some extent able to adapt itself to an overmoist habitat by generating secondary roots to supersede the injured primary ones, and by improving the ventilating system in the primary tissues so as to facilitate oxygen transport from the top to the roots (cf. Figs. 3-5). These modifications affected directly the ventilating pressure as shown in Fig. 2. A shallow root system formed during the treatment caused the plant to absorb less amount of nutrients from the soil, resulting in a poor growth of plants. When the plant had grown up to heading, however, the ventilating System was virtually blocked up, so that no roots remained alive, being severely afflicted with deficient oxygen supply (cf. Figs. 6-8). The leaves dried up more rapidly and accordingly smaller amonts of grains were produced. The plant, when flooded at the heading stage and kept treated thereafter, did not reveal any longer such effective modifications as above-described in response to adverse circumstance, because of its senescence, e.g. blocking up of the ventilating system and inactivity of root formation. Simultaneous drying up of all leaves within a week after flooding brought forth a remarkable reduction in grain yield. (2) The plant of Kentucky-31-fescue as well as of reed canary grass was equipped with well-developed ventilating system even in the senescent stage of growth under standard conditions, as inferred from the seasonal changes in the ventilating pressure (cf. Figs. 9-11). They were highly resistant to excess-moisture injury by flooding as an excellent ventilating system might They always be ready for furnishing their roots with sufficient supply of oxygen necessary for respiration. showed a slightly suspended growth for a while after treatment, but it was not nearly until the time of establishment of a new root system and of improved ventilating facilities, in adaptation to their new habitat, that they resumed vigorous growth. In consequence, the flooded plants could yield larger dry weights than those by the check plants. (3) Alsike clover, too, was capable of adapting itself to overmoist habitat almost in the same way as seen in Kentucky-31-fescue. Ecological responses to flooding were reflected upon a lower ventilating pressure throughout after flooding, suggesting that oxygen transportation from the top to the roots had been accelerated. Noteworthy was the anatomical feature of the ventilating system particular to this crop (cf. Figs. 12-14). (4) Genge was found susceptible to excess-moisture injury. Upon flooding, it could neither improve the ventilating system nor generate new roots, resulting in a simultaneous shedding of almost all the leaves and consequently in a stunted growth of plants. The epidermis of the stem undr water was reformed likely enough to absorb some water and nutrients, taking the place of poorly functioning roots (cf. Figs. 15-16). It was for this reason that the flooded plant could survive so far as to ploduce a few mature seeds. (5) From these results it may be concluded that the tolerance against excess-moisture injury is closely related to the development of the ventilating system, whose mode and degree are particular to the kind of crops. In this case the improvement of the ventilating system as well as the reformation of the root system is necessary for making the plant possible to transport more oxy
  • 児玉 敏夫, 鈴木 信治
    1955 年 24 巻 1 号 p. 59-62
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
    Experiments were performed to investigate the relation between plant growth and soil structure. Several forms of soil structure were prepared by mixing the coarse aggregates with ground soil. The coarse aggregates were gotten by sieving the air-dry diluvial volcanic ash soil and ground soil was gotten by grinding the coarse aggregates until it passed through a 0.25mm screen. I. Seed germination of wheat as affected by soil structure. Three forms of aggregated soils were filled in specially deviced Petri dishes by placing the wheat seed in the soil. These Petri dishes were kept at constant temperature (24∼25°C) in closed container. Poor aggregation caused limitation of emergence at both high and low soil moisture meanwhile emergence was taken place at medium soil water content. It was said that the poorer the granulation in soil, the narrower the suitable soil moisture range for seed emergence. The factors which limited the emergence might be the reductive condition at higher soil moisture and crusting of soil at lower moisture. II. Relation between the growth of wheat plant at early growing stages and soil structure. Wheat plants were grown in greenhouse pots filled with 700g air-dry soils prepared to have each of the 4 forms of soil structure. Soil moisture were kept at 4 grades, supplying the water from the bottom of pot through sand layers of various thickness. A coarsly aggregated soil brought much better plant growth especially in root than did the less aggregated soil. As a possible cause of the reduced growth in the unaggregated soil, insufficient supply of oxygen is suggested and it might suppressed the ability of roots to absorb nutrients.
  • 中川 勝八
    1955 年 24 巻 1 号 p. 63
    発行日: 1955/10/20
    公開日: 2008/02/14
    ジャーナル フリー
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