氮钾配施对芋头产量和品质的影响

Effect of nitrogen and potassium on yield and quality of taro

采用二次饱和D-最优设计,研究了氮钾肥配施对芋头产量和品质的影响,并建立了以氮、钾肥施用量为变量因子,芋头产量和品质为目标函数的二元二次数学模型。模型解析表明,氮、钾肥对芋头产量和品质均有显著影响,且钾肥的影响大于氮肥;氮、钾肥之间存在显著的交互效应。在氮(N)、钾(K2O)施用量分别为261 75kg hm2、757 50kg hm2以内,产量随施肥量的增加逐渐提高,超过此施用量,则产量下降。在本试验条件下,施肥量为N34 5～531 0kg hm2,K2O526 8～1057 2kg hm2,芋头产量可达30000kg hm2以上。

The effects of nitrogen and potassium on yield and qualities of taro were studied with the design of double saturated D-optimal regression. According to the data obtained, a mathematical model was established; in which N and K applied were independent variables, taro yield and quality were dependent variables. The models analysis showed that taro yield and qualities were influenced largely by nitrogen, potassium and their interaction; and potassium had heavier effect than nitrogen. Within the extent of N 261.75kg/hm^2?K_2O 757.50kg/hm^2, yield increased with the increase of fertilizer, over-rate the yield decreased. The most suitable amounts of fertilizer for over 30000 kg/hm^2 yield of taro were N 34.50～531.00(kg/hm^2), K_2O 526.80～1057.20kg/hm^2 under this experimental conditions.