Effects of different soil improvement measures on highly salinized soil in greenhouse vegetable filed
The phenomenon of secondary salinization of soil in greenhouse vegetable fields is common,which seriously restricts the sustainable development of greenhouse vegetables.The effects of different soil improvement measures on the yield,nitrogen use efficiency and soil properties of Chinese cabbage were studied with highly and ultra-high salinized greenhouse soils.Six treatments were conducted in the field trial:no nitrogen fertilizer(0%N),traditional nitrogen rate(100%N),lime nitrogen application+traditional nitrogen rate(Lime+100%N),lime nitrogen application+20%N reduction(Lime+80%N),lime nitrogen application+catch corn+traditional nitrogen rate(Lime+corn+100%N)and lime nitrogen application+catch corn+20%N reduction(Lime+corn+80%N).Compared with 100%N treatment,the yield of Chinese cabbage treated with lime+corn+80%N were increased by 91.8%(11.3 t/hm2)and 62.2%(5.6 t/hm2)on highly and ultra-high secondary saline soils,respectively,which significantly improved the nitrogen use efficiency.In highly saline soils,the application of lime nitrogen reduced soil EC by 16.0%-19.7%(P<0.05)compared to 100%N treatment,and had no significant effect on soil pH.Compared with lime nitrogen treatment(Lime+100%N and Lime+80%N),the soil EC were decreased by 49.4%and 55.2%(P<0.05)under Lime+corn+100%N and Lime+corn+80%N treatment,and the soil pH were increased by 3.4%and 12.6%,respectively.In ultra-high secondary saline soils,the application of lime nitrogen treatment had no significant effect on soil EC compared to 100%N treatment,which increased soil pH by 14.1%to 16.0%(P<0.05),compared to lime nitrogen application treatment,soil EC were decreased by 43.7%and 43.7%(P<0.05)under Lime+corn+100%N and Lime+corn+80%N treatments.Different soil improvement measures significantly increased soil porosity and reduced soil available phosphorus and available potassium contents on highly salinized soils,but had no significant effect on ultra-highly salinized soils.
greenhouse vegetablessecondary salinizationsoil acidificationsoil pHyieldnitrogen use efficiency
NETL
NSTL
万方数据
