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１９９６～１９９８年在河北省滦县试区进行冬小麦土壤养分限制因子与高产高效施肥指标试验。结果表明，在滦河三角洲沙区，氮、钾是冬小麦产量的土壤养分限制因子，限制因子对冬小麦产量的效应Ｎ＞Ｋ２Ｏ。效益最佳平台区施肥量单施化肥时，Ｎ用量为２９３．４０～３１２．７５ｋｇ／ｈｍ２，Ｋ２Ｏ为１７０．７０～１７８．９５ｋｇ／ｈｍ２；施用有机肥３０ｔ／ｈｍ２时，Ｎ用量为２９７．６０～３１３．６５ｋｇ／ｈｍ２，Ｋ２Ｏ为１５１．５０～１５９．１５ｋｇ／ｈｍ２。
1996 to 1998 in Luanxian County of Hebei Province to test the limiting factors of soil nutrients and fertilization index of high yield and high yield. The results showed that nitrogen and potassium were the limiting factors of soil nutrients and the limiting factors of winter wheat yield were N> K2O in sandy area of Luanhe River Delta. In the area with the best benefit, the amount of N applied was 293.40 ~ 312.75kg / hm2 and the K2O was 170.70 ~ 178.95kg / hm2 when applying fertilizers alone. When applying 30t / hm2 of organic fertilizer, the amount of N was 297%. 60 ~ 313.65kg / hm2, K2O is 151.50 ~ 159.15kg / hm2.