脱毒甘薯增产机理及最佳氮钾配比研究

脱毒甘薯增产效果及氮钾配比试验表明，推广种植脱毒甘薯增产效果十分显著，其增产的主要机理是：①脱毒甘薯个体健壮，生长发育速度快；②群体光合面积大，光合产物多；③大中薯比率高、库容量大。其氮钾肥产量模型为ｙ＝２２００．４７＋１９５．５２７Ｎ＋１００．０７３３Ｋ－１０．９８８５Ｎ＾２＋５．５２９ＮＫ，经济合理施肥量分别为１０．９６ｋｇ和９．４１ｋｇ，Ｎ、Ｋ最佳配比为１．２：１。每ｋｇＮ可增产甘薯６８－７

Studies on Production Increase Mechanisms and Optimum Proportion of N K Fertilizer Application in Virus free Sweet Potato

The results of experiment on the production increase mechanisms and N-K fertilizer Proportion showed that planting virus}ree sweet potato can significantly increase yield.Its mechanisms in clude:growth and development fast and individual strong; colony photosynthesis area large and photosynthsesis outcome more; rate of big and middle sweet potato high and storage capacity great.The N-K yield model is Y=2200.47+ 195.527N+100.0733K-10.9885N²+7.6523K2+5.529NK²,The economic and rational amount of N-K fertilizer application is 10.96 kg and 9.41 kg,respectively.Optimum proportion of N-K fertilizer is 1.2:1.The yield can increase 68-75 kg per kilogram N and 16.6-28.1 kg per kilogram K₂O fertilizer.