南方农业学报2011，Vol.42Issue(3)：295-298,4.
不同施肥条件下甘蔗对钾的吸收利用研究
Potassium uptake and its utilization in sugarcane under the different fertilization levels
摘要
Abstract
[Objective]The present experiment was conducted to study the mechanism of potassium uptake and its utilization in sugarcane under the different fertilization levels. [Method]A field experiment was conducted on plant crop and first ratoon crop of sugarcane variety ROC22 to find out the uptake amount and utilization rate of potassium in plants and its surplus content in the soil at different growth stages under different treatments. The cation-anion exchange resin was used to monitor the amount of leaching potassium in the treatments with and without potassium fertilizer. [Result ]Great differences in potassium uptake intensity at different growth stages have been observed in plants treated with different levels of K fertilization. The K content in sugarcane plant decreased with progression of sugarcane growth . with the highest K content at seedling stage and the lowest at maturity stage. The uptake amount of K was found to increase after application of K fertilizer. The utilization rate of potassium in plant and ratoon cane was 34.3-40.6％ and 29.4-31.7％. respectively.The availahle K content in plant cane soil decreased at different f'ertilization levels, while it increased in ratoon crop soil.The amount of leaching potassium in soils fertilized with potassium increased significantly compared to non-feitilizing potassium treatment. The soils of both the plant and ratoon cane were found to have surplus K in P2K2 and N2P2K3 treatments while it was lesser in N2P2K2, N2P2K1 and N2P2 treatments. The K content was f'ound to be least in N2P2 treatment.[Conclusion]Different fertilization levels affected the potassium utilization rate , its mobility and the balance of potassium in soils. Practically, nitrogen, phosphorus and potassium should be applied rationally in order to improve the utilization rate of fertilizers to ensure the high-yield and quality sugarcane.关键词
不同施肥条件/甘蔗/钾利用率/钾淋溶Key words
different fertilizing levels / sugarcane / utilization rate of potassium/ leaching potassium分类
农业科技引用本文复制引用
谭宏伟,周柳强,谢如林,黄美福..不同施肥条件下甘蔗对钾的吸收利用研究[J].南方农业学报,2011,42(3):295-298,4.基金项目
国家自然科学基金重点项目(U1033004-12) （U1033004-12）
IPNI资助项目 （）
广西自然科学基金项目(0832202) （0832202）
广西农业科学院科技发展基金重点项目(2007001Z) （2007001Z）
国家农业部项目(WX-2-07-13) （WX-2-07-13）
国家科技支撑计划项目(2007BAD30) （2007BAD30）
