Preliminary study on the mechanism of growth promoting of tobacco by Pseudomonas fluorescens RB-42 and RB-89

The tobacco absorption of P and K was promoted in greenhouse pot after inoculated with Pseudomonas fluorescens RB-42 and RB-89 In this test, the tobacco absorbability of P was obvious than the absorbability of K The contents of P and K in leaf were also higher than CK The fresh leaf weight treated respectively with RB-42 and RB-89 was 8.42% and 37.18% higher than that of CK1, 2.34% and 29.44% higher than that of CK2;the leaf dry weight was 23.81% and 40.47% higher than that of CK1, 1.69% and 15.68% higher than that of CK2; the leaf area was 32.48% and 67.21% higher than that of CK1, 11.65% and 40.92% higher than that of CK2; the height of seedling tobacco was 26.32% and 64.29% higher than that of CK1; the contents of Mn、Zn、P、K、Ca、Mg in tobacco rhizosphere secretion and the tobacco proton secretive ability increased after inoculated with P. fluorescens RB-42 and RB-89 in potted tobacco experiment The pH declined by 1.5 with RB-89 inoculating