Effect of nitrogen and potassium on yield and quality of taro

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/hm2、K2O 757.50kg/hm2, yield increased with the increase of fertilizer, over-rate the yield decreased. The most suitable amounts of fertilizer for over 30000 kg/hm2 yield of taro were N 34.50～531.00(kg/hm2), K2O 526.80～1057.20kg/hm2 under this experimental conditions.