Appropriate fertilization levels for qing-geng-cai cultivation in Aichi Prefecture
2015
Takei, M. | Ikeda, A. | Yoshikawa, N. | Ohashi, Y. | Kasuya, M.
Making a fertilizer more suitable to its environment has become an important issue due to the environmental effects of nutrient loss from fertilizers through agricultural areas. We investigated the actual state of fertilization in farmers' fields cultivating Qing-geng-cai, as well as the amount of nutrient uptake. Moreover, we made some preliminary calculations to determine the amount of fertilizer required to reach the target yield. 1. Pellets of organic compound fertilizer (10-6-10) were used as a basal dressing. The amount of N fertilization was 8.8 g /square m in summer and 9.2 g /square m in winter, phosphate fertilization was 5.3 g /square m and 5.5 g /square m, and potassium fertilization was 8.8 g /square m and 9.2 g /square m. 2. The yield was 3.7 kg /square m in summer and 4.3 kg /square m in winter. The N content of soil had a tendency to be higher in summer than in winter. The amount of N uptake was 9.7 g /square m in summer and 8.8 g /square m in winter, the amount of phosphoric acid uptake was 2.6 g /square m and 2.4 g /square m, and the amount of potassium uptake was 15.4 g /square m and 14.2 g /square m. A strong correlation was observed between yield and nutrient absorption. 3. The amount of fertilization required to guarantee a yield of 3.5 kg /square m in summer and 4.0 kg /square m in winter was calculated based on the results above. The calculated amounts of fertilization were as follows: N: 9.4 g /square m in summer and 9.3 g /square m in winter, phosphate: 5.6 g /square m and 5.3 g /square m, potassium: 9.8 g /square m and 9.4 g /square m.
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