Relationship between Ammonium Nitrogen in Soil Solution and Tiller Number at Early Growth Stage of Rice
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概要
- 論文の詳細を見る
Exchangeable NH_4^+ -N in paddy soils is adsorbed onto cation exchange sites in the soil or present in the soil solution. Although numerous researchers have reported the existence of a relationship between the amount of exchangeable NH_4^+ -N in soil and rice growth, differences in the tiller number and the amount of N in rice among different fields cannot be explained by the amount of exchangeable NH_4^+ -N in soils. On the other hand, it has been shown in pot experiments that higher amounts of NH_4^+ -N in the soil solution led to a higher tiller number and a larger amount of N in rice. However, little information is available on the relationship between the amount of NH_4^+ -N in the soil solution and tiller number under different field conditions. The objective of this study was to clarify the relationship between the amount of NH_4^+ -N in the soil solution and the tiller number in different farm fields. The results obtained were as follows: 1) The relationship between the amount of NH_4^+ -N in the soil solution and the tiller number at 20 d after transplanting (DAT) was positive and could be represented by a linear equation. 2) There was no relationship between the soil CEC and tiller number at 20 DAT. No significant relationship between the soil CEC and the amount of NH_4^+ -N in the soil solution was detected. 3) The amount of positive charges in the soil derived from Fe^2+ was approximately 4.0-40.8 cmol(+) kg^-1 dry soil, and that of NH_4^+ -N was approximately 0.15-0.82 cmol(+) kg^-1 dry soil at 20 DAT, suggesting that ferrous iron occupied the cation adsorption sites in soil, resulting in an increase in the amount of NH_4^+ -N in the soil solution.
- 社団法人日本土壌肥料学会の論文
著者
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Kakuda Ken-ichi
Faculty of Agriculture, Yamagata University
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Ando Ho
Faculty of Agriculture, Yamagata University
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Ando H
Faculty Of Agriculture Yamagata University
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Ando Ho
Faculty Of Agriculture Kagawa University
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Sasaki Yuka
Faculty Of Agriculture Yamagata University
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Kakuda K
Faculty Of Agriculture Yamagata University
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Kakuda Ken-ichi
Faculty Of Agriculture Yamagata University
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Sasaki Yuka
The United Graduate School of Agricultural Sciences, Iwate University
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