Study on the effect of reduced chemical fertilizer application on soil improvement of saline rice fields
To study the effects of chemical fertilizer reduction and its application with organic fertilizer,soil conditioner,and functional fertilizer on soil fertility,bacterial community diversity,and rice growth and development in saline rice fields to provide a theoretical basis for chemical fertilizer reduction and efficiency enhancement in saline rice fields in this region.In this study,rice'1747'was used as the test material for two consecutive years,and five fertilizer treatments were setup,namely,100％chemical fertilizer treatment(CF),20％chemical fertilizer reduction(RF),20％chemical fertilizer reduction with organic fertilizer(OF),20％chemical fertilizer reduction with soil conditioner(SC),and 20％chemical fertilizer reduction with functional fertilizer(FF).The results showed that the RF treatment reduced soil pH and total solubility salt for two consecutive years by 0.58％and 7.17％,respectively,compared to the CF treatment.And under reduced chemical fertilizer application,OF,SC,and FF treatments significantly reduced soil Na+,Ca2+,HCO3-,and Cl-contents,and also improved soil fertility.The chemical fertilizer reduction rationing treatments(OF,SC,FF)enhanced the diversity of soil bacterial communities,while changing the structure of soil bacterial community phyla,increasing nutrient rich bacterial communities such as Actinobacteria,Proteobacteria,and Bacillus,and reducing nutrient poor bacterial communities such as Chlorobacteria and Acidobacteria.RDA analysis showed that the main factors affecting the bacterial community phylum structure were available phosphorus,available potassium,and total nitrogen.Compared with CF treatment,the chemical fertilizer reduction rationing treatments(OF,SC,FF)increased rice spike length,grain number,thousand-grain weight,and yield by 3.56％-6.48％,11.20％-24.95％,8.81％-6.28％,and 6.04％-18.39％,respectively.In a comprehensive analysis,the 20％reduction of chemical fertilizer with functional fertilizer can effectively improve saline soil fertility,and bacterial community diversity,thus promoting rice growth and development,which can achieve the purpose of saline soil improvement and sustainable rice development.
saline landreduced chemical fertilizer allocationsoil amendmentsoil bacterial communityyield
万方数据
维普
