紫色土植物促生菌筛选及其复合菌剂对生姜种苗的促生效应

从轮作蔬菜紫色土中筛选出3株不同的植物促生菌(PGPB)菌株,分别为具自生固氮能力的解淀粉芽孢杆菌(Bacillus amyloliquefaciens GN03)、具溶磷作用的短小芽孢杆菌(Bacillus pumilus RP01)和具解钾作用的环状芽孢杆菌(Bacillus circulans JK02),将3种菌株配制成复合菌剂进行生姜种苗盆栽试验。结果表明,接种牛粪-拌施复合菌剂处理总体表现最优,与牛粪-拌施市售生物菌肥处理相比,根际细菌自生固氮菌、溶磷菌和解钾菌数量显著增高了1 674.1%、8 709.1%和225.2%;土壤速效磷、速效钾含量显著提高了87.5%和23.0%;姜苗分蘖数、叶面积和地上部、地下部干质量分别提高了40.0%、45.9%和28.6%、25.0%。应用适宜的PGPB复合菌剂对紫色土微生态环境和生姜种苗的生长有较好的促进效应。

Screening of Plant Growth-promoting Bacteria from Purple Soil and Growth Promoting Effects of Its Complex Microbial Inoculant on Ginger Germchit

Three PGPB（Bacillus amyloliquefaciens GN03，Bacillus pumilus RP01 and Bacillus circulans JK02）isolated from purple soil were mixed as a complex bacterial inoculant. A pot experiment was conducted to examine the effects of the complex inoculant on ginger germchit. The results indicated that the treatment of complex inoculant mixed with cow-dung（T2）had the best performance. Comparing the treatment of commercial bio-fertilizer（CK2），the treatment mixed with cow-dung remarkably increased the numbers of azotobacter，P-solubilizing and K-solubilizing bacteria by 1 674.1%，8 709.1% and 225.2%，respectively. Soil available P and K of the T2 were significantly enhanced by 87.5% and 23.0%，respectively. The tillering numbers，leaf areas，dry weight of shoot and root were increased by 40.0%，45.9%，28.6% and 25.0% under T2，respectively.Applying appropriate PGPB complex microbial inoculant can efficiently improve the micro-ecological environment and promote the growth of ginger germchit in purple soil.