施氮时期对马铃薯钾积累分配及块茎级别的影响  

Effects of Nitrogen Application Time on Potassium Accumulation,Distribution and Tuber Set of Potato

作　　者：孙磊[1,2] 刘向梅[2] 谷浏涟[2] 刘元英[2] 李学湛[1] 闫秀峰[1] 

机构地区：[1]东北林业大学博士后科研流动站/黑龙江省农业科学院博士后科研工作站,黑龙江哈尔滨150030 [2]东北农业大学资源与环境学院,黑龙江哈尔滨150030

出　　处：《作物杂志》2013年第2期100-103,共4页Crops

基　　金："十二五"国家科技支撑项目(2012BAD06B02);国家973前课题(2012CB126307)

摘　　要：以克新13脱毒原种为试验材料,采用小区试验方法,在150kg N/hm2用量条件下,研究了不同追氮时期对马铃薯钾积累、分配及收获期块茎级别的影响。结果表明,马铃薯各器官含钾量始终表现为地上茎>块茎>叶片。与氮肥全部做基肥相比,将1/3氮肥在块茎形成末期追施,可显著提高收获期块茎中钾的积累量(11.8%)及分配比例(22.3%),同时通过增加商品薯的数量及平均商品薯重量显著提高商品薯率(P<0.05)。但在基肥不足条件下分施氮肥,或在基肥充足条件下氮肥追施过早,都在不同程度上抑制钾在块茎中的积累和块茎的膨大。A plot experiment was carried out to study the effects of nitrogen （N） application time on potassium （K） accumulation and distribution ,as well as on tuber set of potato. Cultivar KX 13 was grown at one N application rate （ 150kg N/hm2 ） and four application patterns. The results showed that K content in stems was higher than tubers and leaves all the time. Splitting N application could boost the absorption of K and increase K distribution ratio in tubers at harvest. Compare to tubers with all N applied at planting, tubers with N dressing at the end of tuber forma- tion stage had a higher K content and K distribution ratio （ P 〈 0.05 ） and a higher marketable tuber ratio by in- creasing the number and average weight will depress the K accumulation in tuber of marketable tubers （ P 〈 0.05 ）. and tuber bulking Insufficient basal N or dressing N early

关 键 词：马铃薯 施氮时期 钾 块茎级别 

分 类 号：S532[农业科学—作物学]