The characteristics of wheat seeding growth and soil microorganisms under biological bacterial fertilizer
To explore the effects of different biological bacterial fertilizers on wheat growth,soil nutrients and microbial quantity,a pot experiment was conducted with wheat(Triticum aestivum L.)as the test object and no fertilizer as the CK control.Four kinds of bio-logical bacterial fertilizers including water-soluble saline-alkali soil composite bacteria(A),insoluble saline-alkali soil composite bacteria(B),Bacillus subtilis(C),Bacillus amyloliquefaciens(D)and three application gradients were set up.The growth index of wheat seedings,physical and chemical properties and microorganisms quantity of soil were determined.The result showed that the plant height,chlorophyll SPAD and aboveground dry matter of wheat seedings treated with four kinds of biological bacterial fertilizers A,B,C and D were higher than those of CK,and these growth indexes of wheat seedlings in each treatment increased with the in-crease of the amount of biological bacterial fertilizers.The contents of soil organic matter,total nutrients(total nitrogen,total phospho-rus and total potassium)and available nutrients(alkali-hydrolyzable nitrogen,available phosphorus and available potassium)of wheat treated with four kinds of biological bacterial fertilizers were higher than those of CK.The number of culturable bacteria and acti-nomycetes in the soil of potted wheat treated with each biological bacterial fertilizer was higher than that of CK,while the number of fungi was lower than that of CK.Through principal component analysis,Bacillus subtilis(C)had the best effect on improving soil when the application amount was 0.80 g/kg.
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