摘要:
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。
Abstract:
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,P2O56.26 kg·hm-2,K2O 93.34 kg·hm-2respectively.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.
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