湖南冬闲田马铃薯氮吸收分配规律研究

摘要

Potato fertilizer absorption and distribution dynamic at different fertilizer levels were analyzed in ＇3414＇ design, and the nitrogen absorption characters at different growth periods in potato were made clearly. The total nitrogen content of aboveround part during the growth period was low at the seedling stage, high at the tuber formation stage, and declined slowly at the tuber maturity stage. The nitrogen content concentration of the above-ground part changed more than those of potato tubers and the contents of nitrogen in potato tubers were the highest at the tuber formation stage and then declined at the tuber maturity stage.%试验采用“3414”设计方案，分析冬闲田马铃薯在不同肥料水平下氮肥吸收分配规律。结果表明：马铃薯地上部全氮含量在全生育期间其动态变化呈现为苗期低，块茎形成期高，而在块茎成熟期缓陧下降的趋势，且在整个生育期内，氮素浓度的变化表现为地上部〉块茎；块茎中氮的含量均在块茎形成期最高，块茎成熟期下降。