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在辽宁西部褐土上历时10 a的田间试验结果表明：氮肥对提高作物产量效果最好，平均增产率50%，平均每千克 N增产粮食21 kg。供试褐土富磷，试验前3 a施磷肥不显增产作用，之后增产明显，10 a平均增产率10.9%，平均每千克 P增产粮食47 kg。供试褐土富钾，连续10 a施钾肥不显增产作用。 在施用化肥基础上每年以60%收获产品直接堆腐回田，可比对应的化肥处理分别增产（10 a平均）40.6%（无肥对照）、19.5%（N肥基础）、12.1%（NP肥）和8.1%（NPK肥），平均年增产粮食（混合、烘干）分别为1.54、1.08、0.79、0.52 t/hm2。养分循环再利用的作物增产效益在试验的10 a中有着逐年增长的趋势，表明以堆肥形式循环回田养分的作物增产作用有着明显的残效叠加效应。
The results of 10 years of experiment on the cinnamon soil in western Liaoning showed that nitrogen fertilizer had the best effect on increasing crop yield with an average increase rate of 50% and an average increase of grain yield of 21 kg / kg N. For the trial of brown soil rich in phosphorus, phosphate fertilizer did not significantly increase production in the first 3 days of the experiment, and then the yield was obviously increased. The average yield of 10 years was 10.9%, and the average yield of grain was 47 kg per kg P. Test brown soil potassium, potassium fertilizer for 10 consecutive days did not significantly increase the role. On the basis of application of chemical fertilizers, 60% of the products were directly piled back into the fields every year, which can increase yield (10 a average) 40.6% (no fertilizer control), 19.5% (N fertilizer basis), 12.1% (NP fertilizer ) And 8.1% (NPK fertilizer) respectively. The average annual grain yield (mixing and drying) was 1.54, 1.08, 0.79 and 0.52 t / hm2, respectively. The crop yield increase effect of recycling of nutrients has been increasing year by year in the first 10 years of experiment, which shows that there is a significant additive effect of crop residues in crop production by recycling fertilizers in the form of composting.