论文部分内容阅读
多年田间试验和调查研究结果表明，嘉兴平原农田土壤养分中有机质积累量与分解量基本平衡，始现盈余。氮磷肥施用量过高，土壤盈余Ｎ１４５２７ｋｇ／ｈｍ２·ａ，相当施肥Ｎ量的２５６５％；盈余Ｐ２３５１ｋｇ／ｈｍ２·ａ，相当施肥Ｐ量的３９１９％。钾肥施用量不足，土壤亏缺Ｋ４１９７ｋｇ／ｈｍ２·ａ，相当于施肥Ｋ量的２３７５％。本文认为今后应坚持有机无机肥结合的施肥制度，控制氮、磷肥用量，以防环境污染，重视钾肥施用，达到土壤养分平衡。
Years of field trials and investigation results show that the accumulation and decomposition of organic matter in the soil nutrients in Jiaxing Plain basically balance, showing a surplus. The nitrogen and phosphorus fertilizer application rate is too high, the soil surplus N145 27kg / hm2 · a, the equivalent fertilization N content 25 65%; surplus P23 51kg / hm2 · a, the equivalent fertilizer P amount 39 19%. The amount of potash fertilizer was insufficient, and the soil deficit was K4197kg / hm2 · a, which was equivalent to 2375% of the amount of K fertilizer. This paper believes that in the future should adhere to the combination of organic and inorganic fertilization system, control of nitrogen and phosphate fertilizer use, to prevent environmental pollution, emphasis on the application of potash to achieve soil nutrient balance.