长期培肥定位试验耗竭阶段各培肥物质对土壤磷库持续效应的研究

试验采用旋转回归设计方法，从１９８６～１９９４年在代表松嫩平原黑土区的东北农业大学试验地内进行了以农肥、化肥、秸秆、绿肥等培肥物质为试验因素的长期定位试验。试验分两个阶段进行，前一阶段为培肥阶段，到１９９２年结束。后一阶段为耗竭阶段，主要观测各培肥处理对土壤养分的持续效应及对产量的影响。建立了耗竭阶段农肥、化肥、秸秆对土壤有机质、全氮、全磷及产量的数学模型。随着耗竭试验的继续，各处理土壤磷库含量都呈下降趋势。在农肥、化肥、秸秆三因素中，农肥对土壤磷库的贡献最佳，化肥次之，秸秆最差

THE STUDY ON SUSTAINABLE EFFECT OF DIFFERENT FERTILIZING MATERIALS ON SOIL PHOSPHORUS STORAGE AT EXHAUST STAGE OF LONG-TERM LOCATION TEST

A long-term fertilizing location test was carried out in the experimental field of Northeast Agriculture University which represent thecharacteristic of the black siol region in Song Nen Plain with rotitional regression design from 1986 to 1994. Farm manure, chemical fertilizer, straw and green manure were used as experemental factors in this test. The test was divided into two stages: the first was fertilizing stage, ended in 1992; the second was exhaust stage, mainly to researchthe sustainable effect of each fertilizing material on siol fertility and yield of maize. A maths model of farm manure, chemical fertilizer, straw to siol oraanic matter, total nitrogen, total phosphorus and yield of maize was established. Following with the exhaust test, the content of soil phosphorus storage of each treatment showed a declining tendency. Among the three facors of farm manure, chemical fertilizer, straw, farm manure made the greatest contribution to the soil phosphorus, then chemical fertilizer, straw the worst.