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Article type: Cover
2000 Volume 71 Issue 4 Pages
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Article type: Cover
2000 Volume 71 Issue 4 Pages
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
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Tetsuo Tokunaga, Akinori Fukunaga, Taigou Matsumaru, Tadakatsu Yoneyam ...
Article type: Article
2000 Volume 71 Issue 4 Pages
447-453
Published: August 05, 2000
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To paddy rice, chemical fertilizers (basal and top-dressing) and one of three livestock manures (cow manure, chicken manure, pig manure) were applied. These N sources changed N accumulation and natural ^<15>N abundance (δ^<15>N) in rice plants. Chemical fertilizers decreased and livestock manures increased the δ^<15>N values of rice plants, respectively. N accumulation from different N sources (soil, chemical fertilizers, livestock manure) calculated by the isotope mass balance method indicated that soil-derived N in rice plants with cow manure, chicken manure and pig manure was 5.1, 5.2 and 4.0g N m^<-2>, respectively. Estimated amounts of manure-derived N in rice plants were 1.7-2.3 g N m^<-2> by cow manure, 2.0-2.7 g N m^<-2> by chicken manure and 3.2-4.9 g N m^<-2> by pig manure. Estimated chemical fertilizer-derived N in rice plants was 0.5-1.5 g N m^<-2> by 2 g N m^<-2> basal application, 1.2-2.0 g N m^<-2> by 4 g N m^<-2> basal application and 1.3-1.8 g N m^<-2> by topdressing.
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Togo Tsuji
Article type: Article
2000 Volume 71 Issue 4 Pages
454-463
Published: August 05, 2000
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The author investigated the regional growth disorders of early-planted rice, of which initial growth is severely and peculiarly inhibited, causing yellow stunting of lower leaves and no increase in stem number after approximately 30 to 40 d of transplanting, to paddies supplemented with a basal paste-like fertilizer at the row sides. No specific responses were found among rice varieties. The field experiments and soil analysis of paddies were carried out; firstly to reproduce the disorders in the late planting of rice, and secondly, to diagnose the components of a commercial fertilizer which has been effectively used by a farmer to recover the disorders. The results obtained were as follows; 1) Disordered paddies contained appreciable amounts of ammonium nitrogen in the soil, indicating no effects of nitrogen deficiencies to rice plants. 2) The specific growth disorders of yellow stunting were also found in the late-planted rice cultivation. Furthermore, the application of a granular fertilizer at the row sides showed less growth disorders as compared to the paste-like fertilizer when they were treated in the same experimental paddy. 3) An experiment to separate the farmers practical fertilizer into a few nutrients for diagnosis showed that any nutrient other than sulfate contributed less to recover the disorders. Consequently, in the following early rice planting experiment, in which the growth disorders by paste-like fertilizer were also induced, the application of magnesium sulfate responded well for recovery within several days under a submurged condition, whereas the recovery by surface drainage took more than 10 d. As a conclusion, the author suggests the disorders will be induced primarily by developed soil reduction, hence causing nutritional disorders in rice plants related to temporary sulfate starvation in the soil.
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Togo Tsuji
Article type: Article
2000 Volume 71 Issue 4 Pages
464-471
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Sulfur absorption and critical contents of sulfur in disordered rice plants during their initial growth were investigated. The results obtained were as follows; 1) The total sulfur content of rice shoots which were inhibited at the time of late planting by the application of a paste-like fertilizer showed 0.12% in dry matter. When this growth was recovered by using the same fertilizer as that used by a farmer, sulfur content was raised to as high as 0.28% in dry matter, together with a remarkable increase in dry matter. 2) A similar response was observed for the early planting of rice in a farmer's paddy with enhanced increments of total sulfur, from 0.09 to 0.40% in dry matter, by the application of magnesium sulfate, the major component of the commercial fertilizer. Also, dry matter increments were twice as high as those recovered by the surface drainage. 3) Surprisingly, the yellow stunting of the initial growth disorders were found by the incorporation of a chloride fertilizer into the plow layer as a basal. Such nutritional disorders were restricted during the tillering stages and the total sulfur content of the shoots decreased to as low as 0.13% in dry matter. However, the higher absorption of inorganic sulfate between the maximum tillering stage and young panicle formation period contributed greatly to the recovery of sulfur deficiency in the rice. 4) Total sulfur contents as well as N/S ratios were significantly correlated to the relative yields. These critical levels were 0.12 to 0.13% of total sulfur and 25 to 21 of N/S ratios when the relative yields were 50 to 55%. The levels were considered practical indicies as far as the present growth disorders are concerned.
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Togo Tsuji
Article type: Article
2000 Volume 71 Issue 4 Pages
472-479
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Sulfate transformation under submurged conditions was investigated by the incubation of Submurged soils applied with granular and paste-like high analysis fertilizers. Secondly, soil samples collected from the fixed paddies for the soil fertility survey, both of farmers and experimental stations, were analysed for humus and sulfur. The results obtained were as follows; 1) Paste-like and granular fertilizers were applied in a layer and mixed in the whole layer respectively, followed by the extraction of soluble and available sulfur with appropriate extractants. As a result, both soluble and available sulfur decreased as the Eh of soils decreased, indicating appreciable amounts of sulfate were transformed to sulfide. 2) Five soils of fixed paddies in which the humus contents differed appreciably were selected to check the changes in available sulfur within 15 y. As a result, humus contents showed relative increases within 15 y, however, the content of available sulfur tended to decrease. The ratios of available to total sulfur significantly decreased within 15 y, indicating the influences of soil pH and/or farmers' practices of fertilizer selection upon the ratios. 3) Soil samples, especially of well-drained paddy in an experiment station, decreased the available sulfur within 20 y. It can be concluded that the greater Eh is reduced in the soils, the higher level of sulfide formed, thus the rice plants will become deficient in sulfate due to the formation of unavailable iron sulfides. This will be much enhanced considering the recent trends of lower levels of available sulfur, which coincidentally inhibited the initial growth of rice in early planting cultivation in our district.
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Atsuko Honjo, Ho Ando, Ken-ichi Kakuda
Article type: Article
2000 Volume 71 Issue 4 Pages
480-487
Published: August 05, 2000
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The relationship between the establishment of seedling directly sown on well-drained paddy field and reduction condition and/or temperature was investigated without coated calcium peroxide. The experiment was conducted in an incubation box under two different temperature conditions (15 and 17℃) and two moisture conditions (flooded and unflooded) under lighted conditions. There were four plots, i.e. high temperature and flooded plot (HTF), low temperature and flooded plot (LTF), high temperature and unflooded plot (HTU), and low temperature and unflooded plot (control, C). Change of the conditions (15 to 17℃ and/or unflooded to flooded) was carried out in 3-d intervals from 0 d after sowing (DAS). Emergence percentage (number of emerged seedlings/number of seeds sown), establishment percentage A (number of established seedlings/number of seed sown) and establishment percentage B (number of established seedlings/number of emerged seedlings) were elucidated. 1) The earlier the change of conditions, the lower the emergence and establishment percentages were observed in HTF as compared with HTU. Higher emergence and establishment percentages were obtained in HTF than LTF when flooding and temperature changes were conducted before 15 DAS. 2) Effect of the beginning time of flooding on establishment percentage B related on the growth stage of rice seedling. Establishment percentage B was divided into 3 groups by the beginning time of flooding, i.e. the lowest was 0 to 3 DAS, medium was 6 to 12 DAS and the highest was 15 to 21 DAS. 3) Consequently, the time after emergence of seedling was the suitable stage for the start time of flooding to obtain high and stable establishment of seedlings of rice plant.
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Yukimi Tamura, Youji Yamamoto, Kwang-Lai Park, Kikuo Kumazawa
Article type: Article
2000 Volume 71 Issue 4 Pages
488-493
Published: August 05, 2000
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The concentration and δ^<15>N value of nitrate nitrogen (NO_3-N) of spring waters in Tamagawa basin were measured from June 1995 to January 1999. 1) Nitrate nitrogen concentrations and δ^<15>N values of the spring waters were 0.12 to 14.1 mg L^<-1> and +0.53 to +8.75‰, respectively. 2) Both were low in the spring waters that flowed from the upper layer of the Tama terrace in the left side of the upper stream of the Tamagawa River, while δ^<15>N values were high with different concentrations of NO_3-N from the lower layer. 3) The NO_3-N concentrations and δ^<15>N values in the spring waters from the lower layer of the Tama terrace in both sides of the central stream of the Tamagawa River were higher than those of the upper stream, reflecting human and agricultural activities. 4) The spring water passing through reed plants have decreased NO_3-N concentration and increased δ^<15>N value.
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Yoshio Ogawa, Hidetaka Katou, Katsuyuki Minami
Article type: Article
2000 Volume 71 Issue 4 Pages
494-501
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Denitrification potential and nitrate removal from solution percolating through soil above a water table were investigated using laboratory columns. The columns were packed with an Andisol subsoil (K(N)) or soil to which 10 g kg^<-1> of cellulose had been added (K+C(N)), and placed in a basin to keep the water level at 94 cm below the surface. To the upper surface of the columns, a KNO_3 solution containing 100 mg L^<-1> of NO_3-N was intermittently applied. Nitrate concentration in the effluent markedly decreased with time, both in the K(N) and K+C(N) columns, with 58 and 30% of the applied NO_3-recovered in the effluent, respectively. The NO_3-N content in the soil, determined after terminating the percolation experiments, showed a marked decrease with depth in the K+C(N) column. This was consistent with denitrification potential of the soils measured as a function of the depth above the water table. The accumulation of (N_2+N_2O)-N during anaerobic incubation was highest in soils taken from the 36-66 cm height in the K+C(N) column, where the first-order rate constant for denitrification was estimated at 5.0×10^<-6>-8.5×10^<-6>s^<-1>. In the K(N) column, the decrease of NO_3-N content with depth was less pronounced, and the rate constant for denitrification was one order of magnitude smaller. Using estimated profiles of the first-order rate constant for denitrification, the measured NO_3-N content profiles in both columns were reasonably reproduced by an approximate steady-state model for NO_3-transport. These results demonstrate that there is a good chance of nitrate removal by denitrification from solution percolating through soil above a water table, and that the nitrate concentration profile in the soil is highly dependent on the amount of easily decomposable organic matter and extent to which reducing conditions have developed in the soil.
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Ryoichi Kaneki, Kazutake Kyuma, Chizuru Inagaki, Hiromichi Odani, Miki ...
Article type: Article
2000 Volume 71 Issue 4 Pages
502-511
Published: August 05, 2000
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Various analytical items of surface water, subsurface water, irrigation water and rain water were measured in experimental plots at the university farm. Three experimental plots were set up: 1. A conventional plot, where ordinary plowing and puddling were practiced with the application of conventional doses of N-P-K as the basal and two top-dressings. 2. No-puddling plot, where plowing, but no puddling, was practiced before transplanting and all the N was applied to the nursery box in the form of a coated fertilizer (containing 30% N and 10% K_2O), with P and K supplemented as the basal before plowing. 3. No-fertilizer plot, where plowing and puddling were practiced but no fertilizers nor pesticides were applied. The surface effluent loads of the no-puddling plot were 31% for T-N, 25% for T-P, 55% for T-COD, 94% for BOD and 27% for SS as compared with those of the conventional plot. The subsurface effluent loads of the no-puddling plot were, likewise, 52% for D-N, 87% for D-P, 78% for D-COD and 89% for BOD. The effluent loads (N, P, COD, BOD, SS) of the conventional plot were greater than the incoming loads, where those of the no-puddling plot were greater for P, COD and BOD but smaller for N and SS than the incoming loads. Thus, the nursery box application of coated fertilizer in combination with no-puddling appeared to be effective in reducing the effluent N and SS loads from paddy fields.
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Yasuhide Mochizuki, Hideshige Toda, Hiroyuki Kawashima
Article type: Article
2000 Volume 71 Issue 4 Pages
512-519
Published: August 05, 2000
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Nitrogen leaching rates were estimated in a vegetable field with a subsurface drainage system in a coastal sand dune area of Shizuoka, Japan, in two different years (1992 and 1994). Nitrate was the major form of nitrogen leached out from the field. Nitrate concentration in the drainage water was high from fall to spring, with the maximum values exceeding 20 mg N L^<-1>. Removal of plastic film covering carrot fields in March might cause the leaching of nitrogen that accumulated in the soil during the carrot growing season during winter. The amount of discharge calculated from working duration of the lifting pumps corresponded well with the amount of percolation separately calculated from precipitation and evapotranspiration. The estimated nitrogen leaching rates showed two seasonal increases in spring and fall, reflecting increases in precipitation and nitrogen concentration in the drainage water. Annual nitrogen leaching rates ranged from 95 to 143 kg N ha^<-1> y^<-1>, which were 26 to 41% of the amount of chemical fertilizer applied. The precipitation in 1994 was extraordinarily low, which resulted in small amount of percolation and a low nitrogen leaching rate. Precipitation greatly affects nitrogen leaching in coastal sand dune areas.
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Junta Yanai, Choung Keun Lee, Mikio Umeda, Takashi Kosaki
Article type: Article
2000 Volume 71 Issue 4 Pages
520-529
Published: August 05, 2000
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To obtain basic information for site-specific soil management that can improve nutrient use efficiency by plants, spatial variability of soil properties was evaluated in a 50×100 m paddy field. Ninety-one surface soil samples were collected after harvesting to investigate the spatial variability of their chemical properties: pH, EC, total C content, total N content, C/N ratio, contents of available P, exchangeable Ca, Mg, K and Na. Fifty samples were also collected after transplanting to investigate that of nitrogen-related properties: total C content, total N content, C/N ratio, and contents of mineralizable N and inorganic N. A geostatistical analysis was carried out to examine within-field spatial variability using semivariograms and kriged maps as well as descriptive statistics. Descriptive statistics indicated more than a 10% coefficient of variation for the EC, total C content, total N content, contents of available P, exchangeable K, Na and mineralizable N, suggesting relatively high variability. The geostatistical analysis indicated a high spatial dependence for all the properties except pH and inorganic N content. The ranges of spatial dependence were about 20 m for EC, total C content, total N content, C/N ratio, contents of exchangeable Ca, Mg, Na and mineralizable N, and about 40-50 m for the contents of available P and exchangeable K. Based on the results of spatial dependence, kriged maps were prepared for the properties to show their spatial distribution in the field. The results reflected the history of soil management of the field in addition to the characteristics of the inherent soil properties. In conclusion, rational sampling interval was evaluated at 20-50 m depending on the soil properties, and the need for site-specific soil management and possibility of precision agriculture were demonstrated even in an almost flat paddy field.
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Hiromi Honma, Haruo Shindo
Article type: Article
2000 Volume 71 Issue 4 Pages
530-532
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Tomoko Oya
Article type: Article
2000 Volume 71 Issue 4 Pages
533-536
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Shigehiro Ishizuka
Article type: Article
2000 Volume 71 Issue 4 Pages
537-541
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Toshiaki Tanimoto
Article type: Article
2000 Volume 71 Issue 4 Pages
542-545
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Hisashi Ao, Takuji Inagaki
Article type: Article
2000 Volume 71 Issue 4 Pages
546-549
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Yoshihiro Kaneta, Tikako Miura, Yasuo Kamada, Toru Kodama, Fukuo Sato
Article type: Article
2000 Volume 71 Issue 4 Pages
550-553
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Haruo Tsuruta
Article type: Article
2000 Volume 71 Issue 4 Pages
554-564
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Satoshi Mori
Article type: Article
2000 Volume 71 Issue 4 Pages
565-574
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Kazuhiko Egashira, Kazuo Ogata
Article type: Article
2000 Volume 71 Issue 4 Pages
575-580
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Teruo Asami
Article type: Article
2000 Volume 71 Issue 4 Pages
581-585
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Tatsuaki Tokuyama, Kiyoshi Takeda, Kazuhira Yokoyama, Norio Wakao, Mas ...
Article type: Article
2000 Volume 71 Issue 4 Pages
586-592
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K. Egashira, J.-L. Han, H. Yahata
Article type: Article
2000 Volume 71 Issue 4 Pages
593-
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Article type: Bibliography
2000 Volume 71 Issue 4 Pages
594-602
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
603-
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
604-605
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
vi-xviii
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Article type: Appendix
2000 Volume 71 Issue 4 Pages
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Article type: Cover
2000 Volume 71 Issue 4 Pages
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Article type: Cover
2000 Volume 71 Issue 4 Pages
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