论文部分内容阅读
本文根据连续 4年的不同氮施用量的试验结果表明 :在白浆型水稻土上随着氮肥施用量的提高土壤有机质含量呈增长趋势 ,碱解氮增高 ,速效磷和速效钾则显著地下降 ;植株体内全氮和全磷含量呈曲线关系 ,全钾呈直线负相关。本试验条件下水稻产量有 44.6%来自土壤生产力 ,55.4%的产量来自人们的施肥和栽培。最高产量的氮肥施用量为 1 71 .1 kg/hm2 ,最佳施用量 1 67.5kg/hm2 ,经济效益最佳 ,投入产出比 1∶ 2 3.2
Based on the results of four years of different nitrogen application rates, the results showed that the organic matter content of white paddy soil increased with the increase of nitrogen application rate, the content of available nitrogen increased, but available phosphorus and available potassium decreased significantly ; Plant nitrogen and total phosphorus content of a curve, total potassium was a linear negative correlation. Under the experimental conditions, 44.6% of rice yield came from soil productivity and 55.4% of the yield came from people’s fertilization and cultivation. The highest yield of nitrogen fertilizer was 1 71 .1 kg / hm2, and the best application rate was 1 67.5 kg / hm2, with the best economic benefit. The input-output ratio was 1:2 3.2