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1988—1990年五茬蔬菜作物定位试验结果表明:有机肥与无机氮肥配合施用对蔬菜有明显的增产效果,并且有机肥累积用量增多,增产效果越显著.连续单施氮素化肥,作物的增产幅度逐渐下降,第五茬明显减产,变量分析得知,有机肥对产量影响极显著,无机肥及有机无机肥的交互作用对产量影响均不显著.连续五茬不施肥的产量仍是当季施肥处理最高产量的62%,所有施肥处理的产量70%以上来自土壤自身营养.每年亩施5000公斤马粪,五茬后土壤有机质含量比试验前增加了5.8gKg~(-1);容重下降4.5%—6%,总孔隙度增加2%—2.7%;全氮增加了0.519gkg~(-1)单施化肥氮五茬后容重增加2.3%—3.8%;总孔隙度减少1%—1.7%.增施有机肥是培肥土壤的有效措施.
The results of five-crop vegetable crop location experiment from 1988 to 1990 showed that the combined application of organic manure and inorganic nitrogen fertilizers significantly increased the yield of vegetables, and the cumulative amount of organic manure increased with the increase of yield. The amplitude decreased gradually and the fifth crop reduced obviously. According to the analysis of variables, the effect of organic fertilizer on yield was significant, and the interaction between inorganic fertilizer and organic-inorganic fertilizer had no significant effect on the yield. The highest yield of fertilization was 62%, and the yield of all fertilization treatments was more than 70% from soil self-nutrition. After applying 5000 kg of horse manure per mu per year, the content of soil organic matter increased 5.8gKg -1 after five stubble treatments, 4.5% -6%, total porosity increased by 2% -2.7%; total nitrogen increased by 0.519gkg -1 fertilizer applied nitrogen five cropping increased 2.3% -3.8%; total porosity decreased by 1% -1.7 %. Adding organic fertilizer is an effective measure to fertilize the soil.