氮磷钾平衡施用对大葱产量和品质的影响研究

Effects of N,P,K balanced application on economical yield and quality of scallion

应用311-A拟饱和最优回归设计和{3,2}单形格子饱和设计,通过氮磷钾肥配比和氮肥分期施用田间试验,拟合大葱施用氮磷钾肥对经济产量、施肥利润及氮肥分期施用比例的效应函数,寻优结果表明:大葱最高产量施肥量分别为N 317.25 kg.hm-2、P2O5kg.hm-26.26和K2O 93.34 kg.hm-2,最佳经济施肥量则分别为N 310.76 kg.hm-2、P2O51.53 kg.hm-2和K2O 89.93 kg.hm-2;氮肥各时期(基肥、前期追肥、后期追肥)较佳施用量分别74.08 kg.hm-2、112.24 kg.hm-2和124.68 kg.hm-2。在相同的肥底下,大葱品质受氮磷钾施用量及氮肥施用时期的影响。

The effect functions of N. P. K coordinative application on economical yield, fertilization profit and N ratio of split application at different growing stage of scallion were studied by the field experiments with 311-A best regression design of supposed saturation and { 3, 2} saturated design of single shape check. The results showed that the best N, P, K fertilization quantity for scallion with maximum economical yield was N 317, 25 kg · hm^-2, P2O5 6.26 kg·hm^-2 . K2O 93.34 kg·hm^-2 respectively. The best N. P. K fertilization quantity for scallion with best fertilization profit was N 310.76 kg · hm^-2 , P2O5 1.53 kg·hm^-2 and K2O 89.93 kg · hm^-2. The better N fertilization quantity at different growing stage of scallion （basal dressing, former and latter topdressing ） was 74.08, 112.24 and 124.68 kg · hm^-2 respectively. At the equivalent fertilizer, the quality of scallion was affected by the N. P. K fertilization quantity and N fertilization periods.