施肥对豫西旱地脱毒甘薯生长发育及产量的影响

Effect of Fertilizing on the Growth and Development and the Yield of Virus-free Sweetpotato on Dry Farmland in the West of Henan

试验结果表明，脱毒甘薯长势较强，施肥处理每667m2日增重茎叶最高达52kg，日增块根鲜重达44kg。栽后100～130d，为块根膨大盛期，增重占全生育期的44．7％，此期为田间管理的关键时期。施肥可显著提高豫西丘陵旱地脱毒甘薯产量。其中，氮肥肥效明显优于钾肥，氮钾配合肥效优于单一施肥，平均增产35％。各处理相比，以每667m2施统N8kg、K2O6．25kg产量最高，比对照增产66.5％。

The result from the experiment showed that non-virus sweet potato grew greatly. When fertilizerteated,the weight increasing of stem and leaf was 52 kg/(667 m2· d)at the utmost and the fresh weight ofroot reached 44 kg/(667 m2· d). After caltured 100~ 130 d, root sprouted prosperously and its weight in-creasing was 44. 7% on total developmcntal stages. It was the key period to soil manage, Fertilizing couldmarkedly raise the yield of non vlrus sweet potato on dryland in the west of Henan. The effect of fertilizerwas nitrogen priority over kalium obviously and nitrogen complement with kalium priority over monfertiliz-ing. The average yield increasing was 35 %,compared wlth other treatments,when fertilizlng pure N 8 kg andK2O6. 25 kg per 667 m2,the yield was the greatest and increased by 66. 5 % over contrast.