不同重茬年数烤烟钾积累、分配和利用研究

为研究烤烟在重茬栽培条件下钾积累分配和肥料利用率变化，试验在田间条件下，以‘龙江911’为试材，选取3、5年茬口试验田，设置自然肥力下ZR3和ZR5 2个处理，常规施肥下CG3和CG5 2个处理。结果表明：植株总钾积累随生育期延后逐渐升高，积累量表现为ZR3>ZR5，CG3>CG5；烤烟根茎叶钾积累规律同植株总钾积累规律，其中，根系和叶片钾积累量表现为ZR3显著高于ZR5，CG3显著高于CG5，茎仅在前期存在显著差异，后期无显著差异；烤烟钾分配比例表现为叶>茎>根，施肥不能改变这种分配格局；钾肥利用率表现为3年茬高于5年茬，分别达到23.72%和20.17%。综合分析认为，为保证烟叶内钾含量的提高，对于多年重茬烤烟应加大钾肥使用量，已经重茬5年的地块，建议不再继续栽培烤烟。

Study on potassium accumulation, distribution and utilization of the different number of years in cropping tobacco

To study the distribution and accumulation of potassium fertilizer use efficiency changes under tobacco cultivation in the continuous cropping,test in field conditions.' Longjiang 911 ' to test materials,rotation plots of selected 3,5,set ZR 5 and ZR 3 two treatment under natural fertility,CG 3 and CG 5 two treatments under conventional fertilization.The results showed that:The total plant K accumulation increased gradually with the growth of the delay.Accumulation showed ZR 3 >ZR 5,CG 3 >CG 5.Tobacco root,...