| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Outline of Final Research Achievements |
A paddy rice cultivation experiment was conducted continuously for five years in the Ultra-low Input Sustainable Paddy Rice System which no fertilizers or pesticides were applied. The rice growth was vigorous and yields were comparable to those of conventional cultivation, although there was some variation from field to field. As the cultivation continued for longer periods, the amount of available phosphate decreased, which significantly affected the growth and yield of paddy rice. Application of leguminous green manure increased soil microbial activity, as well as soil enzyme activities related to carbon, nitrogen, and phosphorus, resulting in higher metabolic turnover. Bacterial community structure analysis of the soil showed no significant differences from the conventional plot, but there was a trend toward an increase in specific bacterial groups during water drainage. Nitrogen fixation by weed endophytes was newly discovered.
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