Effects of Different Treatments of Grape Branches In-situ Returning to the Field on Decomposition and Soil Properties
[Objective]It was aimed to explore the effects of applying microbial agent with nutrition,soil conditioner and urea during the branches in-situ returning to the field on decomposition rate of branches and soil properties,which provided scientific basis for time-saving and labor-saving fertilization utilization of branches.[Method]Taking non-branches returning to the field as the control(CK),through field experiment,four treatments[T1(non fertilization),T2(225 kg/hm2 urea),T3(225 kg/hm2 urea+60 kg/hm 2 microbial agent with nutrition)and T4(225 kg/hm2 urea+60 kg/hm 2 microbial agent with nutrition+300 kg/hm2 soil conditioner)]were set up to study their effects on decomposition rate of branches and soil properties.[Result]The decomposition rate of branches,soil organic matter,porosity and water content under T4 treatment increased by 12.7%—33.3%,5.52%—33.04%,3.61%—16.41%and 2.40%—19.66%compared with CK,T1,T2 and T3,respectively,while the soil bulk density decreased by 6.19%—16.54%.The bacteria,actinomyces and fungi under T4 treatment increased by 0.09-6.94 times,0.33-7.78 times and 0.31-1.03 times compared with CK,T1,T2 and T3,respectively.The activity of CAT,saccharase,urease and phosphatase under T4 treatment increased by 0.25-5.48 times,0.04-0.65 times,0.31-1.78 times and 0.12-1.60 times compared with CK,T1,T2 and T3,respectively.N,P,K,Ca,Mg,Fe,Zn and B with different treatments showed as T4>T3>T2>T1>CK.[Conclusion]The branches in-situ returning to field can improve the decomposition rate,soil organic matter content,porosity,water content,microbial quantities in soil,enzyme activity and content of mineral elements,reduce the soil bulk density.Applying 225 kg/hm2 urea,60 kg/hm2 microbial agent with nutrition and 300 kg/hm2 soil conditioner during grape branches in-situ returning to the field has the best effect.
grapebranchesin-situ returningmicrobial agentsoil conditionerdecomposition rate of grape branchessoil propertiesenzyme activity
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