Effects of Returned Straw to the Field and Phosphorus Bacteria on Soil Microecology and Green Bean Yield
The effects of returned straw and exogenous additional phosphorus bacteria on soil microecology and crop yield were studied,corn straw and stinky pseudomonas(Pseudomonas putida)with phosphorus solubilizing ability were used as research objects.By cultivating green beans in greenhouse facilities,the effects of different treatments on the number of phosphorus solubilizing bacteria,soil available phosphorus content,phosphorus solubilizing ability,and green bean yield in soil and rhizosphere were studied.The research results showed that there were significant differ-ences in the number of phosphorus solubilizing bacteria in the soil of three treatments:corn straw(treatment 1),corn straw+phosphorus bacteria(treatment 2),and phosphorus bacteria(treatment 3).Among them,treatment 2 had the highest number,with 31.89％higher than the control area,and the difference reached significantly(P＜0.05).All three treatments could significantly increase the number of phosphorus solubilizing bacteria in the rhizosphere of soy-bean,with a significant difference(P＜0.05).Among them,treatment 2 was the highest,86.30％higher than the control,and the difference reached an extremely significant level(P＜0.01);The effective phosphorus content in the soil of the three treatments was significantly higher than that of the control,with a significant difference(P＜0.05).Among them,treatment 2 had the highest content,which was 9.8％higher than the control;There is a significant difference in soil phosphorus solubilization ability among the three treatments.Treatment 1 and Treatment 2 can signif-icantly improve soil phosphorus solubilization ability,which are 50.2％and 65.2％higher than the control,respec-tively,with extremely significant differences(P＜0.01);all three treatments had a significant increase in yield of green beans,but the difference was significant.Treatment 2 showed a significant increase in yield compared to Treat-ment 1 and Treatment 3,with an increase of 6.8％and 10.3％,respectively,and the difference reached a significant level(P＜0.05);Treatment 2 increased yield by 15.5％compared to the control,with a significant difference(P＜0.01).The research results indicate that the combination of corn straw and exogenous addition of phosphorus bacteri-a,P.putida,can significantly increase the number of phosphorus solubilizing bacteria in the soil and rhizosphere of green beans,increase the content of available phosphorus in the soil,improve soil phosphorus solubilization ability,and promote green beans yield as compared with the single use of corn straw and phosphorus bacteria.This indicated that corn straw and phosphorus bacteria have mutual promoting effects.This study can provide reference for the combi-nation of straw returning with the addition of phosphorus bacteria,improving the conversion rate of phosphorus in soil,promoting crop yield,and future research and development of phosphorus solubilizing microbial agents.
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