土壤2017，Vol.49Issue(4)：699-705,7.DOI:10.13758/j.cnki.tr.2017.04.009
秸秆钾替代化肥钾对莴笋的营养效应研究
Effects of Straw Potassium Replacing Chemical Potash Fertilizer in Lettuce Production
摘要
Abstract
Field experiments were carried out in two vegetables planting bases of Chongqing to study the effects of straw potassium replacing chemical fertilizer potassium on the yield, quality, nutrient uptake and potassium utilization rate of lettuce. 5 treatments were designed, including CK1 (no chemical K), CK2 (ordinary chemical K), ML+KH (10% maize straw K + 90% chemical K), MM+KM (30% maize straw K + 70% chemical K ), MH+KL (50% maize straw K + 50% chemical K ). The results showed that lettuce yields were significantly increased in the two bases (by 11.4%–13.7% and 11.4%–15.3%, respectively) with an order of MH+KL>MM+KM>ML+KH>CK2>CK1. Compared with CK2, the treatments with maize straw K replacing chemical K was not significant in increasing lettuce yield, while reduced significantly Vc and sugar contents in lettuce leaves (by 4.7%– 16.8% and 3.2%–30.5%, respectively), while slightly increased the two indexes in lettuce stem. Nitrate contents were increased significantly in lettuce leaves (by 8.0%–8.2% and 11.4%–17.2%, respectively), while nitrate content in lettuce stems decreased by 2.5%–11.5% in basis 1 but increased by 8.0%–13.5% in Basis 2. The contents of calcium, magnesium, iron and manganese in lettuce leaves were increased in Basis 1, but calcium content was decreased in Basis 2. Straw K replacing chemical fertilizer K increased significantly the uptake of lettuce to nitrogen, phosphorus and potassium, and MH+KLtreatment had the maximum K utilization efficiency, which is the optimal for lettuce production if taking yield, quality and nutrient uptake into consideration.关键词
秸秆钾肥/替代/化学钾肥/莴笋Key words
Straw potassium/Substitution/Chemical fertilizer/Lettuce分类
农业科技引用本文复制引用
谷守宽,袁婷,陈益,杨东,文娟,熊小莉,李戎,李振轮,王正银..秸秆钾替代化肥钾对莴笋的营养效应研究[J].土壤,2017,49(4):699-705,7.基金项目
国家公益性行业(农业)科研专项(201203013-5)和国际植物营养研究所(IPNI)项目(2013-Chongqing-02)资助. （农业）
