氮钾配比对烤烟K326产量与产值的影响

目的]研究不同氮钾肥单效益与交互作用对烤烟产量、产值的影响,寻求最佳配比组合.方法]采用田间小区试验,设低氮(45kg/ha)、中氮(90 kg/ha)和高氮(135 kg/ha)3个氮水平与低钾(180 kg/ha)、中钾(270 kg/ha)和高钾(360 kg/ha)3个钾水平,共9个处理组合,研究氮钾配比对烤烟产量、产值的影响.运用SAS统计分析软件对试验结果进行回归分析,建立回归模型,并根据产量、产值结果结合QBASCE程序进行优化寻优.结果]氮、钾肥均能增加烤烟的产量,但氮肥的增产效应大于钾肥;需要适量的氮和较高水平的钾,才有利于烟叶产值的提高.最高产量方案施肥量为:112.5kg/haN、360 kg/ha K2O,烟叶产量52185.95 kg/ha.最高产值方案施肥量为:108 kg/haN、360kg/ha K2O,烟叶产值为23394.15 元/ha.结论]建立的氮钾用量对烟叶产量、产值影响的回归模型可为相近类型土壤种植烟叶参考.最佳方案施肥量为108kg/haN、360kg/haK2O.

Yield and output value of flue-cured tobacco K326 under various ratio of N to K

【Objective】Impacts of single effect and interaction effect of N and K fertilizers on yield and output value of flue-cured tobacco were studied to find out the best combination of two fertilizers. 【Method】Nine treatments composed of 3 N levels（45， 90， 135 kg/ha）and 3 K levels（180， 270， 360 kg/ha）were designed to study different ratio of N to K on yield and output value of flue-cured tobacco. Following regression analysis by SAS statistical analysis soft， regression models were established and the results of yield and production value were processed by QBASCE. 【Result】Both N and K fertilizers boosted the yield of flue-cured tobacco， N fertilizer showed bigger yield increasing effect than K fertilizer. Combining moderate N and high level K was favorable for increasing output value of flue-cured tobacco. The combining N and K fertilizer formula of highest yield was 112.5 kg/ha N and 360 kg/ha K2O， the yield of tobacco leaves reached 2185.95 kg/ha. The combining N and K fertilizer formula of highest output value of tobacco leaves was 108 kg/ha N and 360 kg/ha K2O， the highest output reached 23394.15 RMBYuan/ha. 【Conclusion】Regression model regarding the effects of ratio of N to K on the yield and output value of tobacco leaves could provide references for tobacco planting in similar soil. The optimal fertilization formula was 108 kg/ha N and 360 kg/ha K2O.