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１９９９年成安县农业局土肥站进行了大白莱叶面喷肥不同肥料的对比试验。供试大白菜品种为郑杂２号，７月５日播种，８月２日定植，６６７ｍ２（亩）１３３５株。底肥６６７ｍ２施普通磷肥１００ｋｇ（公斤），碳铵１００ｋｇ，９月３０日随水追施碳铵１５０ｋｇ。１０月７日?
1999 Cheng County Agricultural Bureau Soil Fertilizer Station carried out a large white leaf foliar fertilizer contrast test of different fertilizers. The test cabbage variety Zheng Zheng 2, sown on July 5, August 2 planting, 667m2 (mu) 1335 strains. Base fertilizer 667m2 Shi ordinary phosphate fertilizer 100kg (kg), ammonium bicarbonate 100kg, September 30 with the water chalcopyrite 150kg. October 7?