氮、磷、钾肥配施对甘薯农艺性状和产量的影响

Effects of Combined Application of Nitrogen,Phosphorus and Potassium Fertilizers on Agronomic Traits and Yield of Sweetpotato

为了筛选甘薯施肥最佳配方,以甘薯品种商薯19为材料,采用田间小区试验,研究了不同氮、磷、钾肥配施用量对甘薯农艺性状和产量的影响。结果表明,甘薯的茎长、分枝数、茎粗、地上部鲜质量及结薯数总体以NPK4处理(氮、磷、钾肥配施比例为1∶1∶2,具体施用量为N 75 kg/hm2、P2O575 kg/hm2、K2O 150 kg/hm2)较为适宜;鲜薯产量以NPK4处理最高,达51 066.67 kg/hm2,显著高于其他处理,比对照(不施肥处理)极显著增产13.42%;茎粗与地上部鲜质量呈显著正相关,分枝数与茎长呈显著负相关,结薯数与鲜薯产量呈显著正相关。

Using sweetpotato cv. Shangshu 19 as material,a plot field experiment was conducted to study the effects of different proportions of nitrogen（ N） ,phosphorus（ P） ,potassium（ K） fertilizers on sweetpota-to agronomic traits and yield. The results showed that as far as the length of the vine,number of base bran-ches,stem diameter,aboveground fresh weight and root number of sweetpotato,the NPK4 treatment with N∶P∶K of 1∶1∶2 and N of 75 kg/ha was optimal. The NPK4 treatment obtained the highest fresh root yield of 51 066. 67 kg/ha,which was significantly higher than the other treatments,and the yield signifi-cantly increased by 13. 42% compared to the control without fertilizer. There was significant positive cor-relation between the stem diameter and aboveground fresh weight,significant negative correlation between the number of base branches and length of the vine,and significant positive correlation between the root number and fresh root yield.