沿海潮土大白菜氮磷钾施肥指标的研究

Study on Fertilizer Supply Index of NPK of Chinese Cabbage in Fluvo-quic Soil

以江苏省海安县沿海潮土、常年蔬菜地为例,采用＂3414＂田间试验设计方法,研究大白菜氮磷钾肥料效应,施肥对大白菜产量、效益、商品性、抗病性的影响,提出了合理施肥策略及目标产量施肥量。结果表明：氮磷钾合理配施大白菜产量、效益最高,商品率提高多达24.5%。增施钙肥,大白菜干烧心发病率降低13.2百分点,商品率提高7.6%。目标产量12-15万kg/hm^2,总施肥量分别为纯N 225-255 kg/hm^2、P2O590-105 kg/hm^2;K2O 180-225 kg/hm^2,比例以1：0.3~0.5：0.7-1为宜。

Taken the perennial vegetable farm in fluvo-quic soil of Haian county as the study region,the ＂3414＇ field experiment was adopted to study the effects of fertilization on the yield,benefit,commoditization and disease resistance and the strategies for reasonable fertilization and the optimal fertilization were put forward.The result showed that the yield and benefit of combined application of NPK fertilizers were the highest,and the commodity rate was increased by 24.5%.The application of calcium fertilizer reduced the incidence of burning heart diseases by 13.2 percentage point and increased the commodity rate by 7.6%.Target yield of 120 000-150 000 kg/hm2 could be reached under N 225-255 kg/hm2,P2O5 90-105 kg/hm2,K2O 180-225 kg/hm2 with the ratio of 1 ： 0.3-0.5 ： 0.7-1.