Relationships between Root Activity and N, P, K, Ca, and Mg Contents in Roots of Field Crops
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概要
- 論文の詳細を見る
Based on the previous paper (Osaki et al. 1995, Soil Sei. Plant Nutr., 41, 635-647), crops were classified by root charaeteristies for nitrogen uptake as follows: Group I (small root dry weight (RW) and high specific absorption rate of nitrogen (SAR_N)): legumes, potato, and beet; group II (large RW and low SAR_N): cereals; and group III (large RW and high SAR_N): sunflower. In the roots of field crops subjected to various treatments in a field of Hokkaido University, the nitrogen, calcium, and magnesium contents in roots were relatively higher in group I than in groups II and III. Potassium content in roots was high in maize and sunflower. Phosphorus content in roots in groups I and II increased linearly with the increase of the nitrogen content, and the contents of both minerals were higher in group II than in group I. However, the phosphorus content in group III remained constant or increased slightly with the increase of the nitrogen content. Potassium content in roots in groups I and II did not change with the increase of the nitrogen content up to a value of about 20 mg g^<-1>, then it increased slightly with the increase of the nitrogen content above a value of about 20 mg g^<-1>, especially in group I. Potassium content in roots in group III was constant regardless of nitrogen content. Calcium and magnesium contents were not related to the nitrogen content in groups I and II, but increased with the increase of the nitrogen content in group III. SAR_N increased exponentially with the increase of the nitrogen content in the roots of groups I and II. In group I, the values of SAR_N were generally higher than in group II for a similar nitrogen content, while in group III, SAR_N increased linearly with the increase of nitrogen content in roots. Consequently, it appears that nitrogen and phosphorus nutrition in roots is very important for the maintenance of root activity (SAR_N).
- 社団法人日本土壌肥料学会の論文
著者
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Shinano Takuro
National Agricultural Res. Center For Hokkaido Region.
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OSAKI Mitsuru
Laboratory of Ecological Chemistry, Division of Applied Bioscience, Graduate School of Agriculture,
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Yamada Satoshi
Institute For Experimental Animals Kobe University School Of Medicine
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Yamada Satoshi
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Yamada Satoshi
Faculty Of Agriculture Tottori University
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Matsumoto Mina
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Shinano T
National Agricultural Research Center For Hokkaido Region
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Urayama M
Hokkaido Univ.
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Ushiki Jun
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Ushiki Jun
Faculty Of Agriculture Hokkaido University
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Shinano Takuro
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Mori Shinano
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Urayama Masaru
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Tadano Toshiaki
Laboratory of Plant Nutrition, Faculty of Agriculture, Hokkaido University
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Mori Shinano
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Yamada S
Fac. Agr. Tottori Univ.
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Tadano Toshiaki
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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