土壤与作物2025，Vol.14Issue(2)：217-226,10.DOI:10.11689/sc.2024122301
钾高效型鲜食大豆根际及非根际土壤钾素生物有效性研究
Potassium bioavailability of rhizosphere and non-rhizosphere soils in potassium high-efficiency vegetable soybean
摘要
Abstract
Potassium high-efficiency vegetable soybeans have a higher absorption and utilization efficiency of potassium and stronger potassium uptake capabilities.However,it is unclear whether their roots enhance the bioavailability of soil potassium through efficient activation,thereby ensuring potassium supply.We conducted a compartmented rhizobox experiment to compare the differences of available and slow-acting potassium in rhizosphere and non-rhizosphere soils at different distances(0-2 mm,2-4 mm,and>4 mm)for K high-efficiency and K low-efficiency vegetable soybeans under two conditions,i.e.no potassium fertilizer application(K0)and normal potassium application(120 kg∙hm-2K2SO4,K120).The results show that,compared to the K low-efficiency variety L7,the K high-efficiency variety L20 exhibits a lower available potassium concentration in rhizosphere and non-rhizosphere soils at different distances with no-potassium fertilization,while the concentrations of slow-acting potassium are higher,especially in the>4 mm non-rhizosphere soil.This indicates that the roots of the K high-efficiency vegetable soybean L20 could utilize lower concentrations of potassium and have a stronger ability to activate slow-acting potassium.Under no-potassium fertilization condition,the K high-efficiency variety L20 has a lower ratio of available potassium to slow-acting potassium(A/S)in rhizosphere and non-rhizosphere soils with higher concentration of slow-acting potassium in rhizosphere and non-rhizosphere soils.Furthermore,no potassium application has slight impact on the dry matter and potassium accumulation in the K high-efficiency variety L20.Strong capacity in activating the transformation of slow-acting potassium into available potassium might be a substantial basis for the potas-sium supply in K high-efficiency vegetable soybean L20.These findings provide important theoretical basis for the breeding of K high-efficiency vegetable soybean varieties.关键词
鲜食大豆/钾高效/速效钾/缓效钾Key words
vegetable soybean/potassium high efficiency/available potassium/slow-acting potassium分类
农业科学引用本文复制引用
于沁覃,夏厚禹,吕艳超,斯琴图雅,刘长锴,张秋英,刘晓冰..钾高效型鲜食大豆根际及非根际土壤钾素生物有效性研究[J].土壤与作物,2025,14(2):217-226,10.基金项目
国家自然科学基金青年基金(42207399) （42207399）
黑龙江省自然科学基金优秀青年基金(YQ2024D009) （YQ2024D009）
黑龙江省科学院院长基金项目(YZ2022YZN02). （YZ2022YZN02）
