长期培肥定位试验耗竭阶段各培肥物质对玉米产量的持续效应的研究

试验采用旋转回归设计方法〔１〕，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玉米产量的影响。建立了耗竭阶段农肥、化肥、秸秆对土壤有机质、全氮、全磷及玉米产量的数学模型〔２〕。试验表明，随着耗竭试验的继续，在产量上和连作不施肥区相比，农肥、化肥、秸秆都有较明显的后效，从两个培肥因素的交互作用上看，农肥与化肥、化肥与秸秆之间有明显的正交互作用，而秸秆和化肥之间也表现了较明显的互补性。

THE STUDY ON SUSTAINABLE EFFECT OF DIFFERENT FERTILIZING MATERIALS ON YIELD OF MAIZE AT EXHAUST STAGE OF LONG-TERM FERTILIZING LOCATION TEST

A long-term fertilizing location test was carried out in the experimental field of Northeast Agricultural University which represent the characteristic of the black siol region in SongNen Plain with rotational 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 research the sustainable effect of each fertilizing material on soil fertility and yield of maize.Established maths mode of farm manure,chemical fertilizer,straw to siol organic matter,total nitrogen,total phosphorus and yield of maize.The test showed,following with the exhaust experiment,farm manure,chemical fertilizer and straw all had a distinct effect on yield when compared to continous cropping and nonfertilized plot.There was a distinct inter-action between farm manure,chemical fertilizer and straw,and there was a distinct mutunefit between straw and chemical fertilizer.