关键词: 体系优化, 体系优化

Abstract:

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 ZR5 and ZR3 two treatment under natural fertility，CG3 and CG5 two treatments under conventional fertilization. The results showed that: The total plant K accumulation increased gradually with the growth of the delay. Accumulation showed ZR3>ZR5，CG3>CG5. Tobacco root, stem and leaf accumulation of potassium as same as total plant K accumulation. Among them, root and leaf potassium accumulation was ZR3 significantly higher than ZR5, CG3 significantly higher than the CG5, stem only significant difference in the early, no significant difference in late. Expressed as the ratio of potassium was leaf> stem> root. Fertilization can not change the distribution pattern. K utilization was 3 years higher than the 5-year-crop stubble, respectively 23.72% and 20.17%. To ensure that the potassium content increased of tobacco, cropping tobacco use should increase the amount of potassium, 5 years had been cropping land, recommended not to continue cultivation of tobacco.