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在辽宁西部褐土上进行的一12年中长期田间试验结果表明:每年施用小剂量磷（P14.4kg·hm-2）和每6年1次大剂量磷（P86.4kg·hm-2）两种施磷方式的作物增产效果相似而以前者略优，两种施磷方式的磷肥利用率12年平均分别为0.38和0.36，表明磷肥在该土壤上有着极持久的残效。在施用氮磷肥基础上，每年以80％的收获籽实和2／3的秸杆喂猪、垫圈，猪圈肥循环回田，11年平均每公顷可增产粮食1吨，增产率17％。经连续施用12年循环回田猪圈肥后土壤的供氮力显著提高，年供氮量180～200kg（N），玉米产量每公顷接近9吨，当季施用氮肥几无增产作用。
A 12-year long-term field experiment on cinnamon soil in western Liaoning showed that the annual application of low-dose phosphorus (P14.4kg · hm-2) and high-dose phosphorus (P86.4kg · hm-2) The yield increase effects of the two phosphorus application methods were similar, but the former ones were slightly superior. The average phosphorus utilization efficiencies of the two phosphorus application methods were 0.38 and 0.36, respectively, indicating that the phosphate fertilizer had a long-lasting residual effect on the soil. Based on the application of N and P fertilizers, 80% of the harvested seeds and 2/3 of the straw are fed to pigs, washers and pigs back to the fields each year, yielding an increase of 1 ton of grain per hectare for 11 years and an increase rate of 17%. After 12 years of continuous application, the amount of nitrogen supply in the soil was significantly increased. The annual nitrogen supply was 180 ~ 200kg (N) and the yield of corn was nearly 9 tons per hectare.