Effects of microbial agents on soil nutrients,cotton yield and quality in drip irrigation cotton fields
[Objective]To study the effects of different application amounts of microbial agents on soil nutrient activation,cotton yield and quality with a view of providing a reference for the rational application of microbial agents in drip irrigation cotton fields.[Methods]The project scheme was designed by combining in-door culture experiment and field community experiment.Indoor culture test setting:the microbial agent was applied to the soil containing the culture box to incubate 0,5,10,15,20 d,respectively to analyze the maximum efficiency of the microbial agent on soil nutrient activation.Four treatments were set up in the field experi-ment:CK(no microbial agent),T1(application of microbial agent 75 L/hm2),T2(application of microbial a-gent 150 L/hm2),T3(application of microbial agent 300 L/hm2),and 3 replicates for each treatment were set to analyze the effects of microbial agent on soil nutrients and cotton yield and quality.[Results]The content of available silicon,available phosphorus and available potassium in 0-20 cm and 20-40 cm soil layers in-creased with the increase of microbial agents,and the T3 treatment effect was the most significant.At 40-60 cm soil layer,the soil nutrients of each treatment were not significantly different from CK.The single bell weight of the T3 treatment increased by 8.7％compared with CK and the yield increased by 14.6％.The pile length,Fracture ratio strength and Spinning uniformity index of T3 treatment were significantly increased com-pared with the control.The Micronaire was reduced and the quality was increased from C2 to B2.[Conclu-sion]On the fifth day of microbial agent application into the soil,the best activation effect on soil nutrients is achieved,which can increase the effective content of silicon,phosphorus and quick potassium in the soil,thus leading to the high yield of cotton and improving the quality,too.
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