Effects of Partial Substitution of Nitrogen Fertilizer with Organic Fertilizer on Soil Physicochemical Properties and Maizegrowth in Salinized Irrigation and Silting Soilsof Northern Ningxia
Secondary salinization has become the main form of soil degradation in anthropogenic alluvial soils in theirrigation areas of Northern Yinchuan,which restricts the sustained high-quality development of agriculture in Ningxia.Taking the typical saline irrigation and silting soils in Ningxia as the research object and using Xianyu 335 as the indication variety,this paper analyzed the effects of different fertilizations on soil physical and chemical properties and maize growth,so as to provide a theoretical basis for fertilization management for saline irrigation and silting soil and improve crop yields in this region.The results showed that fertilization could effectively increase the contents of available nutrients in saline irrigated and silted soil,and therefore,increase maize yield and its constituent elements.In all fertilization treatments,all the soilphy sicochemical properties and maize growth parameters peaked under the treatment of 50%substitution of nitrogen fertilizer with organic fertilizer(N at187.5 kg/ha,P2O5 at 100.0kg/ha,K2O at 100.0 kg/ha and organic fertilizer at 7.3 t/ha)in addition to the peak of root length androot surface are aunder conventional fertilization treatment(N at 375.0 kg/ha,P2O5 at 100.0 kg/ha and K2O at 100.0 kg/ha).When compared with nofertilization,contents of soil organic matter,available nitrogen,available phosphorus and available potassium under 50%substitution treatment were increased by 34.5%,25.9%,120.5%and 23.7%,respectively,whereas the ear length,ear diameter,number of grains per ear and yield of maize were increased by 40.5%,15.2%,80.5%and 104.8%,respectively,and the bald tip length was decreased by 78%.Compared with the conventional fertilization treatment,contents of soil organic matter,available nitrogen,available phosphorus and available potassium under 50%substitution treatment were increased by 36.5%,21.4%,13.7%and 8.6%,respectively,whereasthe ear length,ear diameter,number of grains per ear and yield of maize were increased by 0.6%,1.9%,5.3%and 3.1%,respectively,and the bald tip length was decreased by 57.7%.Comprehensive analysis showed thatdifferent fertilizations could improve the physical and chemical properties of saline irrigation and silting soil and then increase the yield of maize,and the effect of 50%substitution of nitrogen fertilizer with organic fertilizer was the most significant.
Nitrogen fertilizer reductionOrganic fertilizer supplementMaizeSalinized irrigation and silting soilSoil-physicochemical propertyYieldIrrigation area in Northern Yinchuan
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