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１９８６～１９８９年在全省各地布置了氮肥不同用量田间试验。按区域类型划分成六大区，提出了各自的施氮模型及建议施用量。同时按土壤类型的不同，编制了碱解氮含量与最佳施氮量便查表。
From 1986 to 1989, field experiments on different amounts of nitrogen fertilizer were arranged throughout the province. Divided into six regions by region type, put forward their own nitrogen fertilizer model and recommended dosage. At the same time according to the different types of soil, the preparation of alkali hydrolysis of nitrogen content and the best amount of nitrogen will check the table.