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在辽西褐土上进行8年的田间试验结果表明，在不同化肥基础上，每年以60％的收获产品堆腐后循环回田，平均分别可获得29．6％（不施化肥）、15．2％（N肥）、11．1％（NP肥）和9．2％（NPK肥）的增产率，或分别每年增产粮食1.33、0．99、0．79、0．64t·hm－2．养分循环再利用的作物增产效益在试验的8年中有着逐年增长趋势，表明以堆肥形式循环回田养分对作物的增产作用存在着明显的残效叠加效应，因此，只有通过长期田间试验方能准确评估农业系统中养分循环再利用的作物产量增益．
Eight years of field experiments on the cinnamon soil in western Liaoning showed that on average 60% of the harvested products were recycled to the fields after harvesting on a daily basis with an average of 29.6% (without chemical fertilizers), respectively. 2% (N fertilizer), 11.1% (NP fertilizer) and 9.2% (NPK fertilizer) respectively, or increase the yield of grain by 1.33, 0.99, 0.79 and 0.64 t · hm -2 . The efficiency of increasing crop yield through nutrient recycling has been increasing year by year in the experiment for eight years. It shows that there are obvious additive effect of crop residues in the form of composting, which means that only the long-term field test can be accurate Assess crop yield gains from nutrient recycling in agricultural systems.