Effects of Bacillus vallismortis and Straw Replacing Phosphorus Fertilizer on Growth,Yield and Quality of Tartary Buckwheat
In order to achieve low-phosphorus cultivation of Tartary buckwheat,pot experiments were conducted using the Tartary buckwheat variety'Jinqiao 6'as the test material,the combination treatments of straw[0 g/kg soil(J0),4 g/kg soil(J1)]and Bacillus vallismortis gz4-1,bacterial liquid concentration[0(P0),104(P1),106(P2),108(P3),1010(P4)cfu/mL]were set.Using normal fertilization as control(CK)to determine the effects of combined application of organophorus degrading bacteria B.vallismortis gz4-1 and straw on the growth,yield and quality of Tartary buckwheat.The results showed that compared with no straw application,B.vallismortis gz4-l-straw could significantly improve the root mass,main root length,total root length and yield of Tartary buckwheat,and showed a trend of increasing first and then decreasing with the increase of bacterial solution concentration.In the combined treatment of B.vallismortis gz4-1-straw,the bacterial liquid concentration of P2 and P3 had the best effects,and the root surface area,root volume,stem diameter,root activity,acid phosphatase activity and the number of ears of Tartary buckwheat reached the optimal growth value under the P2 treatment.However,the root fresh weight,dry weight,main root length,total root length,plant height,stem and leaf fresh weight,dry weight,leaf area,grain weight per plant,1000-grain weight,yield and flavonoids content of Tartary buckwheat reached the optimal growth value under P3 treatment.In addition,compared with CK,the replacement of P fertilizer by B.vallismortis gz4-1 and straw could promote the production of Tartary buckwheat and significantly increase the yield of Tartary buckwheat when the concentration of B.vallismortis gz4-1 were the concentrations of P2 and P3.Therefore,it was recommended that the optimal concentration of B.vallismortis gz4-1 in the combined treatment of B.vallismortis gz4-1-straw were 106-108 cfu/mL.
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