Study on Rational Phosphorus Fertilizer Application Dose on Rhizome Lotus in Hubei Province

Rational phosphorus fertilizer application dose on rhizome lotus was studied by field experiments.The results showed that under the condition on nearly equal theoretical rhizome lotus yield,the critical value of P2O5 application dose determined by linear + plateau model(68.8～106.9 kg/hm2) was greatly lower than the optimum economic P2O5 application dose determined by quadratic model(117.6～144.0 kg/hm2).According to the present status of rhizome lotus production,and taking fertilization of farmer practice and lotus field soil P fertility into consideration,rational P2O5 application dose on rhizome lotus in Hubei province was suggested to be 75.0～120.0 kg/hm2 with an average of 90.0 kg/hm2.