Isolation of Plant Growth Promoting Rhizobacteria and Selection of Microbial Organic Fertilizer Carriers

Plant growth promoting rhizobacteria in microbial fertilizer can not only produce plant hormones to improve the growth of roots and shoots, but also accelerate the release of nutrients in traditional organic fertilizer. Using mixture of plant growth promoting rhizobacteria and traditional organic fertilizer is considered an economical and environment-friendly approach. In this research, a multifunctional composite microbial organic fertilizer was found and tried to solve the problems of soil caused by long-term use of chemical fertilizer and change the irregular release of nutrients in traditional organic fertilizer. Using active microbial concentration and the release of nutrients as indicators to study the effect of the microbial organic fertilizer application on soil fertility, this study indicated that the quantity of active bacteria increased more greatly by turf application than other traditional organic fertilizer carriers. However, using mixed chicken manure (CH) and corn straw (CO) as carriers had same active microbial concentration compared with turf. It indicated that this carrier can be used as an alternative carrier to turf as non-renewable resources. The present findings showed that the CH + CO carrier had the optimal conditions with 30% water content, 30 degrees C temperature, and 10(8) CFU mL(-1) (CFU = Colony-Forming Units) initial cell concentration. The application of the microbial fertilizer was conducive to improving the rhizospheric microecological environment, improving crop yield and quality and alleviating the problems associated with long-term use of chemical fertilizer. (C) 2019 Friends Science Publishers