摘要
为探明施钾量对不同主栽甘薯品种产量、产量构成及钾素吸收和利用的影响,以3种甘薯品种为材料,田间设置不同施钾水平试验。结果显示,各甘薯品种产量均随施钾量上升而提高,增施钾肥对甘薯地上部分生物量的影响小于根系,施钾的增产作用主要表现在甘薯数量的增加,单薯质量则次之;甘薯茎、叶钾含量高于薯块,且增施钾显著提高甘薯茎叶和薯块的含钾量。甘薯品种间钾的吸收及利用对施钾的响应不同,相对高效的徐薯22钾素主要积累在根部,宁薯192及浙紫1号则相反。甘薯钾利用效率与植株钾浓度呈显著负相关,而与产量无显著相关性。表明增施钾肥可以提高甘薯产量,其增产作用主要表现在提高单株结薯数;甘薯含钾量对施钾的响应主要体现在根部,甘薯品种间钾利用效率主要受植株钾浓度的影响。
To investigate the effects of potassium（ K） application rates on yields,K absorption and utilization in different sweet potato genotypes,field tests of K application rates were carried on three different genotypes of edible sweet potato,Ningshu 192,Zhezi 1 and Xushu 22. The results showed that K fertilization increased tuberous root dry matter of sweet potato by increasing the tuber number,and,to a less degree,the mean tuber weight. Above-ground parts got higher K concentration than those in tube,and K concentrations in tube and above-ground parts increased with the increase of K fertilization. The K uptake and utilization varied among genotypes,and Xushu 22,with high use efficiency,got dominant K accumulation in tube root,while Zhezi 1 and Ningshu 192 had opposite trends. The K use efficiency（ KIUE） had a significant negative correlation with K concentration in the whole plants at maturity. No significant correlation was found between root dry matter yield and KIUE. It was concluded that increasing potash application could enhance the sweet potato productivity by improving tuberous root numbers per plant. Tuberous root of sweet potato gave higher response to K supply than above-ground part,and the K use efficiency were mainly affected by the K concentration in the tissues of sweet potato.
出处
《江苏农业学报》
CSCD
北大核心
2016年第1期84-89,共6页
Jiangsu Journal of Agricultural Sciences
基金
江苏省农业科技自主创新基金项目[CX(14)2005]
国家公益性行业专项项目(201203013)
现代农业产业技术体系项目(CARS-11-B-15)
海南省农业科技服务体系建设专项(HNXH201530)
关键词
甘薯
施钾量
吸收
利用率
sweet potato
K application rate
absorption
K use efficiency
作者简介
齐鹤鹏（1984-），男，吉林长春人，硕士研究生，主要从事蔬菜的植物营养学研究。（Tel）025—84391171
通讯作者：朱国鹏，（E-mail）guopengzhu@163．com
