Yield and nutrient dynamics of vegetables in an open field treated with a three-year dose of cattle manure compost
2016
Tsuji, M. | Yamamoto, T. | Kasuya, M. | Suzuki, R. | Takeuchi, M.
The yield and nutrient dynamics of vegetables were comparatively evaluated between vegetables cultivated in a field to which cattle manure compost was applied every year and vegetables cultivated in a field to which a three-year collective dose of compost was applied only once. The yield of vegetables in the field with this three-year collective application of compost was equal to or higher than that in fields to which compost was not applied, although it was slightly lower than that in fields to which compost was applied every year in the summer crop. Total carbon, total nitrogen, available nitrogen and exchangeable potassium in the field with the three-year collective application initially increased followed by a decrease; this cycle continued in over the 3 years. In the three-year collective application field, considerable surplus nitrogen was observed in the first year when compost was applied, although the amount of leaching nitrogen did not substantially increase. Therefore, if a three-year collective dose of compost is applied, with subsequent reduction in fertilizer application, it is possible to reduce environmental impact maintaining vegetable yield. The available phosphorus acid content in the soil and the phosphorus uptake by crops in the three-year collective application field were higher than that in the field with no compost application. Therefore, we determined that there was no shortage phosphorus supply. Exchangeable potassium content in the soil of the three-year collective application field was significantly higher in the compost application year, although it rapidly decreased after the second year. Potassium is thought to have leached from the surface soil and migrated to the underlying layers and the leaching continued.
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