Ammonium Nitrogen in Soil Solution and Seed Nitrogen Affect the Percentage of Establishment of Rice Plants in Submerged Soil

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概要

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• The effect of ammonium nitrogen concentration in soil solution on the estab lishment of rice plants was examined. The increase of the concentration decreased the percentage of establishment of seeds sown in submerged soil, although most of seeds sown on submerged soil became established. Therefore, the increase of ammonium nitrogen concentration in soil solution may impair the establishment of seeds sown in submerged soil, which would occur presumably because the increase delays the spear growth and emergence without the decline of soil redox potential. Several seed lots with various nitrogen contents were obtained from rice plants grown under various conditions. The percentage of establishment of low-nitrogen seeds sown in submerged soil was much lower than that of high-nitrogen seeds, especially in soils whose solution contained a large amount of ammonium nitrogen. However, the difference in the percentlarge amount of ammonium nitrogen. However, the difference in the percentsoil was much smaller. Therefore, the increase of seed nitrogen content may improve the percentage of establishment of seeds sown in submerged soil, presumably because the increase accelerates the spear growth and emergence. Consequently, for direct sowing in submerged soil, ammonium nitrogen concentration in soil solution should remain low because ammonium nitrogen exerts an adverse effect on seedling establishment, and vigorous seeds with a high an adverse effect on seedling establishment, and vigorous seeds with a high on seedling establishment.

• 一般社団法人日本土壌肥料学会の論文

著者

• Hara Yoshitaka

  Department Of Lowland Farming Hokuriku National Agricultural Experiment Station

• Toriyama Kazunobu

  Department Of Lowland Farming Hokuriku National Agricultural Experiment Station

• Toriyama Kazunobu

  Department of Hokuriku Farming System Research, National Agricultural Research Center

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• Seed Nitrogen Accelerates the Rates of Germination, Emergence, and Establishment of Rice Plants
• Ammonium Nitrogen in Soil Solution and Seed Nitrogen Affect the Percentage of Establishment of Rice Plants in Submerged Soil
• Estimation of Nitrogen Release from Coated Urea Using the Richards Function and Investigation of the Release Parameters Using Simulation Models

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