论文部分内容阅读
１９８７～１９９２六年试验结果表明：轮作、连作氮、磷肥料利用率均以普耕最高，平均为氮３２．１％，磷１２．４％；其次是深松为氨２６．１％，磷９．１％；免耕最低为氮１７．３％，磷６．２％，而连作高于轮作。供试作物氮肥利用车轮作：大豆＞玉米＞小麦；连作：小麦＞玉米＞大豆，磷肥利用率轮作、连作均为玉米＞小麦＞大豆。不同年份间氮、磷肥料利用率变化较大。相关分析结果表明：大豆氮、磷肥料利用率与７月份降水量相关显著，ｒ值分别为０．８７３９＊，０．８７５９＊。
From 1987 to 1992, the results of six years showed that the utilization rates of crop rotation and continuous cropping of nitrogen and phosphate fertilizers were the highest in general farming, 32.1% of nitrogen and 12.4% of phosphorus, followed by 26.1% of ammonia and 26.1% of phosphorus, respectively 9.1%. The lowest no-tillage was nitrogen 17.3% and phosphorus 6.2%, while the continuous cropping was higher than the rotation. Crops used for nitrogen fertilizer use wheel: soybean> corn> wheat; cropping: wheat> corn> soybean, phosphorus utilization rotation, continuous cropping are corn> wheat> soybean. Nitrogen and phosphate fertilizer utilization rates vary greatly in different years. The results of correlation analysis showed that the utilization of nitrogen and phosphorus fertilizers was significantly correlated with the precipitation in July, with r values of 0.8739 * and 0.8759 *, respectively.