西北地区山药养分限制因子及平衡施肥研究

Study on the Nutrient Limiting Factors and Balanced Fertilization of Yam in Northwest Area

以"平凉山药"为试材,研究了8种不同施肥方案下西北半干旱地区山药的农艺性状和产量表现。结果表明:OPT处理是山药比较合理的施肥方法,N、P、K无论哪种养分匮缺,均能影响山药块根单重,进而影响到群体产量。各施肥处理以OPT处理产量最高,OPT-N、OPT-1/2N处理较OPT处理减产率分别为33.19%、28.79%,较其它施肥处理减产明显,说明在西北半干旱地区N是山药高产栽培的主要限制因子。

Taking ＇Pingliang yam＇ as material,eight different fertilization scheme were conducted to study the agronomic traits and yield performance of yam in northwest China semi-arid area. The results showed that the best treatment of balanced fertilization was OPT,no matter what kind of nutrient of nitrogen（N）,phosphorus（P）,potassium（K） deficient, could effect the yam tuber weight, then effect the population yield. All treatments with OPT had the highest yield, OPT- N,OPT-1/2N than OPT production rates were 33. 19% and 28. 79%, compared with the other treatments reduced obviously,in northwest China,N was the main factor limiting high yield cultivation of yam.