【摘要】 以甘薯高淀粉品种6-9-17为材料,采用随机区组设计,研究钾肥作底肥一次性施入不同用量对甘薯产量及植株性状的影响.结果表明,随着钾肥用量的增加,产量、单株薯数、单株薯质量、地上部鲜质量、块根鲜质量、茎长、茎粗、基部分枝数和大中薯率都有所增加;产量与单株薯质量、单株薯数、茎粗、茎长、基部分枝数都达到显著或极显著正相关;产量与钾肥施用量的最佳估测模型为逻辑斯谛模型:Y=2 115.315 2/(1+EXP(-0.473 980-0.220 043 X)).本试验中,在N,P2O5施用量为9kg和5kg情况下,以施K2O 20kg/667m2产量最高.更多还原

【Abstract】 The sweet potato cultivar with high starch content,6-9-17,was grown in a field experiment with the complete randomized block design and supplied with potassium at different rates as basal dressing to study its effect on the agronomic traits and yield.of the crop The results showed that yield,tubers/plant,tuber weight/plant,shoot fresh weight,tuber fresh weight,stem length,stem diameter,number of basal branches and the percentage of big and medium-sized tubers all increased with potassium application rate.Tuber yield was in a significant or highly significant positive correlation with tuber weight/plant,tuber number per plant,stem diameter,stem length and number of basal branches.A highly significant regression relationship was observed between potassium rate and tuber yield,which could well be described with the function:Y=2 115.315 2/(1+EXP(-0.473 980-0.220 043 X)).In this experiment,the highest yield was obtained in the treatment of K2 O 20kg/667m2+N 9kg/667m2+P2O55kg/667m2.更多还原