| Screening of plant growth promoting rhizobacteria strains and effects of inoculant on growth of maize by replacing part of chemical fertilizers |
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| DOI：10.7606/j.issn.1000-7601.2013.02.12 |
| Key Words: plant growth promoting rhizobacteria (PGPR) inoculant maize biomass economic yield |
| Author Name | Affiliation | | RONG Liangyan | Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China；
Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | YAO Tuo | Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China；
Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China
Sino-U.S. Centers for Sustainable Development of Grassland and Animal Husbandry, Lanzhou, Gansu 730070, China | | HUANG Gaobao | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Qiang | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Qinghai | Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HAN Huawen | Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LU Hu | Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Five potential plant growth promoting rhizobacteria (PGPR) strains were screened based on their properties of phosphate dissolving, nitrogenase activity, 3-indoleacetic acid (IAA) secreting, antagonism of patho
gens and growth rate, and the rhizosphere inoculant was produced by mixing these strains. A field experiment was conducted in 2009 and 2020 to investigate the effects of the inoculant on growth of maize by replacing part of chemical fertilizers. The results showed that the quality of the composite microbial inoculant complied with the standard of Microbiological Fertilizer of China (NY227-94). By applying the inoculant to replace 20%～30% of chemical fertilizers, the plant height, above-ground biomass, ear length, ear diameter, ear number per unit area, grain number per ear and economic yield of maize were all raised. In the demonstrative fields in 2010, the inoculant treatment (inoculant + 80% fertilizer) could increase maize yield by 9.86%, reduce cost by 620.1 yuan·hm-2, increase income by 2 291.4 yuan·hm-2, and increase direct economic benefit by 2 851.5 yuan·hm-2. |
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