Effects Of Integrated Application Of Biogas Slurry Water And Fertilizer Instead Of Chemical Fertilizer On Greenhouse Crops And Soil Properties

In recent years,with the rapid development of the large-scale livestock and poultry breeding industry in China,the amount of livestock and poultry manure has increased significantly,and whether livestock and poultry manure can be properly disposed of has become one of the important factors determining the sustainable development of livestock and poultry breeding.The biogas project fermenting manure into biogas slurry and biogas residue for agricultural production is an effective measure to reduce pollutant emissions from intensive farms.The biogas slurry is rich in nutrients necessary for plant growth and development,and has a fast-acting nutrient capacity.It is a good and efficient liquid fertilizer.As a fertilizer source instead of chemical fertilizer,biogas slurry can not only reduce the investment cost of agriculture and fertilizer production,but also make Livestock and poultry manure can be recycled.However,unreasonable excessive application of biogas slurry can also cause secondary salinization of soil and soil quality,which will affect crop yield and quality.Therefore,this study uses the biogas slurry produced by the fermentation of livestock manure and waste-water from large pig farms in the Yangling High-tech Agricultural Technology Industry Demonstration Zone in Shaanxi,and then the“pig-marsh-vegetable”technical model formed by the integrated irrigation system of solar greenhouse.Objective To analyze the variation of nutrient content in biogas slurry in different seasons,and to study the effects of biogas slurry instead of chemical fertilizer and reduced fertilization on the growth of melon,watermelon and tomato in early spring,aiming at the efficient use of local biogas slurry nutrients and vegetable biogas hydrolyzate.The integrated safety and rational application provides scientific guidance and theoretical basis,and also provides reference for the scientific management and utilization and scientific application of biogas slurry in other regions.The main conclusions obtained through research are as follows:?1?Analysis of changes in biogas composition in different seasons,the results show that:the pH of the biogas slurry in different seasons is 8.20⁸.45,all of which are slightly alkaline;from October 2017 to June 2018,biogas EC,organic matter,humic acid The contents of soluble organic carbon,total nitrogen,total phosphorus,total potassium and sodium increased first and then gradually stabilized.This change was mainly caused by the fact that the farm did not implement rain and sewage separation,and the concentration of manure in the precipitation from September to October 2017 caused.The total nitrogen,phosphorus and potassium contents of the biogas slurry in the steady state were 1402 mg/L,47 mg/L and 1328 mg/L,respectively.The nitrogen in the biogas slurry mainly existed as NH₄⁺-N.?2?The effect of biogas slurry water and fertilizer integration on chemical fertilizer application on the yield,quality and nutrient uptake of“Emerald”muskmelon in greenhouse cultivation shows:check without fertilization?CK?,conventional fertilization?CF?,fertilizer reduction?FR?,There was no significant difference in dry matter quality and nutrient carrying capacity between melon liquid replacement?BS?and biogas slurry reduction?BR?.There was no significant difference in single fruit weight and yield;biogas slurry replacement?BS?and biogas slurry reduction?BR?treatment of melon soluble total sugar,soluble solids,sugar acid was significantly improved compared with conventional?CF?treatment;biogas slurry?BS,BR?application and fertilizer reduction?FR?treatment were more effective than conventional fertilization?CF?treatment 26.77%,8.49%and 3.37%;the nutrient utilization rates of N,P and K in BR and FR treatment were 12.47%,9.84%,15.26%and 11.10%,9.62%and 41.47%,respectively,compared with CF treatment.The absorption of N,P₂O₅ and K₂O for each 1000 kg of economic yield under greenhouse cultivation was 4.35 kg,1.31 kg and 7.46 kg,respectively,and the average demand ratio was1:0.30:1.72.?3?The effect of biogas slurry water and fertilizer integration on the application of fertilizers on the yield,quality and nutrient uptake of watermelons in the greenhouse cultivation of“Qingding No.1”small gifts:check without fertilization?CK?,conventional fertilization?CF?,fertilizer reduction?FR?,biogas slurry replacement?BS?,biogas slurry reduction?BR?,there is no significant difference in total dry matter quality,nutrient carrying capacity,single fruit weight and yield between different treatments;biogas slurry replacement?BS?,biogas slurry reduction?BR?treatment of watermelon fruit soluble total sugar,soluble solids,sugar and acid compared with conventional fertilization?CF?treatment were significantly improved;fertilizer reduction FR and biogas slurry instead of BS treatment compared with conventional fertilization CF treatment of the cost increase;watermelon daylight The absorption of N,P₂O₅ and K₂O for each 1000 kg of economic yield under greenhouse cultivation was 2.10 kg,0.58 kg and 4.12 kg,respectively,and the demand ratio was 1:0.28:1.96.?4?The effect of biogas hydrolyzate integrated fertilizer and reduced fertilization on the yield,quality,nutrient uptake and soil physical and chemical properties of the autumn sorghum and spring sorghum in the solar greenhouse showed that different treatments had no significant effect on the nutrient uptake of spring tomato.Compared with conventional?CF?treatment,the nutrient utilization rate of tomato treated with fertilizer reduction?FR?and biogas slurry reduction?BR?increased,and the nutrient utilization rate of N,P and K in FR treatment increased by 4.23%compared with CF,respectively.16.93%and 70.30%,BR treatment increased by 4.91%,15.72%and 19.19%;BR treatment can achieve the effect of increasing yield,and the soluble sugar content of tomato fruit is significantly improved compared with CF treatment;biogas slurry?BS,BR?and FR Compared with CF treatment,the treatment increased efficiency by 7.03%,14.10%and 10.98%respectively;the appropriate amount of biogas slurry had little effect on soil pH value.Excessive continuous application would increase soil conductivity,increase salinization risk and cause crop yield reduction.