盆栽条件下溶磷菌对花生生长的影响

Effects of Phosphate-solubilizing Bacteria B1 (Bacillus thuringiensis) on Peanuts in Pot Experiment

利用本实验室在红壤茶园土中筛选出的高效溶磷菌B1,以红壤为基质进行花生盆栽试验,研究溶磷菌B1对花生生长的影响。试验设置接种溶磷菌(B1,苏云金芽孢杆菌)、直接添加草酸(OA)、磷酸二氢钾(KP)以及空白对照(CK)处理。结果表明溶磷菌在红壤中定殖能力强、存活性较好;与对照相比,接种溶磷菌能显著提高土壤有效磷含量,促进花生根瘤的形成以及地下部生长发育,增加根面积、根体积和根尖数,花生果实的双荚果比例提高5%,百仁重高出3.8 g,果实中粗蛋白的含量增加2.5%。各项指标都显示,接种溶磷菌的效果要显著好于直接添加草酸的效果,而与直接添加可溶性磷源的效果相当。因此开发有效的溶磷菌剂应用于大田生产是可行的。

With Bacillus thuringiensis BI from the red soil as phosphate-solubilizing bacteria （PSB）, a pot experiment was conducted to study its effects on the available phosphorous （P） content of the red soil and the growth of peanuts. Four treatments were designed as follow： CK---control; B1--with B1 added; OA--with oxalic acid added; KP--with K.H2P04 added. The results showed that the population of PSB increased significantly in B1 treatment, soil available P, the number of peanuts nodules were increased in B1 treatment compared to control. Inoculation of B1 could promote the growing development of peanut root system. The plant hundred-nutlet weight, the ratio of double pods, the crude protein content of peanut fruit increased 3.8 g, 5% and 2.5% in B1 compared to control. The PSB B1 showed great potential as superior isolate for high efficient biological phosphorus fertilizer.