【摘要】 通过2000、2002年田间定点试验,研究了华北平原潮土土壤碱解氮、速效钾、有效磷含量在空间上的分布和时间上的变化及其对农作物的产量效应。结果表明,我国华北地区土壤碱解氮含量水平稳中有升;速效钾含量水平较高,但有递减的趋势;有效磷含量水平很低,但空间变异性较大,制约了作物的增产。研究表明传统的施肥方法很难改善土壤养分的空间变异结构,甚至会使土壤养分水平更加不平衡,只有根据土壤养分的丰缺状况,有针对性地实施精准施肥和科学管理,才能改善土壤养分的空间分布。更多还原

【Abstract】 A 2-year field experiment was conducted in North China Plain to determine the spatio-temporal variability of available N, P and K in ochric aquic cambosols,and to evaluate the effect of available nutrients on crop yield. The results showed that the content of hydrolyzable N tended to increase, the content of available K was relatively high but tended to decrease gradually with time, and the level of available P was very low and showed a high spatial variation. It was suggested that site-specific fertilizer management rather than traditional fertilization be adopted so as to improve the spatio-temporal variability of soil available nutrients.更多还原