The proper technique for continuous application of organic material judging from physicochemical properties of soil, crop yield, and the impact on surrounding areas
2009
Takama, Y.(Tochigi-ken. Agricultural Experiment Station, Utsunomiya (Japan)) | Hirosawa, M.
This study was conducted for 29 years in the Andisol upland that covers over half of the arable land in Tochigi Prefecture. This study elucidated the effects of organic materials on crop growth and physicochemical properties of soil based on results obtained after the 21st year. Total nitrogen accrued in soil is influenced by the nitrogen content of artificial manure and nutrient balance, including organic materials. The amount of nitrogen applied, including artificial manure and organic materials, influences crop growth the most; however, when amount of nitrogen applied increased, elution of nitrate nitrogen and exchangeable cations increased, thereby decreasing the pH of the soil. It is desirable to apply rice straw compost at 1.7 t/10 a/year, cattle feces at 3.5 t/10 a/year, or pig manure at 1.7 t/l0 a/year on Andisol upland fields in Tochigi Prefecture, when considering the physicochemical properties of soil, the growth of crops, and the influence to surrounding areas.
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