钾肥基施不同用量对甘薯产量及农艺性状的影响  

Effects of Potassium Aapplication as Basal Dressing on the Agronomic Traits and Yield of Sweet Potato

作　　者：滕艳[1] 黄廷荣 唐道彬[1] 杨国才[1] 高旭[1] 陈香颖[1] 王季春[1] 

机构地区：[1]西南大学农学与生物科技学院重庆市甘薯工程技术研究中心,重庆400716 [2]重庆市酉阳县农业委员会,重庆酉阳409800

出　　处：《西南大学学报（自然科学版）》2014年第9期44-48,共5页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市科委甘薯良种创新项目资助(CSTC2012ggB80007);国家自然科学基金资助项目(31101192);现代农业产业体系建设专项:CARS-11-C-20

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.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 20 kg/667 m2 ＋N 9 kg/667 m^2 ＋P2 O5 5 kg/667 m2 .

关 键 词：甘薯 钾肥 产量 农艺性状 

分 类 号：S531[农业科学—作物学]