施氮量对高淀粉甘薯品种龙薯24号产量的影响

Effect of Nitrogen Fertilizer Application Rate on Yield of High-starch Sweet Potato Variety Longshu 24

采用单因素随机区组设计,分析了不同氮肥施用量[0、45、90、135、180、90(缓释氮肥)kg/hm^2]对高淀粉甘薯新品种龙薯24号的性状、产量、干物质积累的影响。结果表明:不同施氮量处理之间,甘薯蔓粗变化不大,差异不显著,随着施氮量的增加,甘薯的平均蔓长、基部分枝数呈增长趋势,施氮各处理均显著高于对照处理;不施肥的N_1的产量水平最低,N_2、N_3、N_4、N_5、N_6的产量随着施氮量的增加而增加,产量最高的是N_5,即施磷量(P2O5)90 kg/hm^2、施钾量(K2O)180 kg/hm^2,施氮量(N)135 kg/hm^2时,最高鲜薯产量达53857.5 kg/hm^2,最高薯干产量16071.1 kg/hm^2,最高淀粉产量11552.4 kg/hm^2。

The single-factor randomized block design was used to study the effects of different application rates [ 0, 45, 90, 135, 180, and 90 （slowly-released） kg/hm2] of nitrogen fertilizer on the character, yield and dry matter accumulation of high- starch sweet potato new variety Longshu 24. The results showed that there was no significant difference in vine diameter of sweet potato among various treatments. With the increase in nitrogen fertilizer application rate, the average vine length and the branch number on the base of sweet potato increased, and they were significantly higher than those in the control （ no nitrogen fertilizer application）. The yield of sweet potato was the lowest in the control, and it was the highest in treatment N5 （ applying P2 05 90 kg/ hm2, K20 180 kg/hm2, and N 135 kg/hm2）. In treatment Ns, the highest fresh tuber yield reached 53857.5 kg/hm2, the high- est dry tuber yield reached 16071.1 kg/hm2, and the maximum starch yield was 11552.4 kg/hm2.