| Home  | About ScienceAsia  | Publication charge  | Advertise with us  | Subscription for printed version  | Contact us  
Editorial Board
Journal Policy
Instructions for Authors
Online submission
Author Login
Reviewer Login
Volume 48 Number 6
Volume 48 Number 5
Volume 48 Number 4
Volume 48 Number 3
Volume 48 Number 2
Volume 48S Number 1
Earlier issues
Volume 40S Number 1 Volume 40 Number 1 Volume 40 Number 2

previous article next article

Research articles

ScienceAsia 40 (2014): 21-27 |doi: 10.2306/scienceasia1513-1874.2014.40.021

Walnut growth and soil quality after inoculating soil containing rock phosphate with phosphate-solubilizing bacteria

Xuan Yua,b, Xu Liuc,*, Tian-hui Zhub

ABSTRACT:     Application of phosphate-solubilizing bacteria (PSB) has been shown to promote plant growth and development in the field and under controlled environmental conditions. The effects of PSB on microbial activity and soil quality are not well known. This study aims to determine the effect of inoculation with three PSB strains on the solubilization of rock phosphate (RP) in soil and growth promotion, nutrient uptake, photosynthetic capacity, and soil enzyme activities of 1-year-old walnut seedlings by using potted experiments with a completely randomized design under single or mixed inoculations. Inoculation with Pseudomonas aurantiaca or P. fluorescens significantly improved the plant height, shoot and root dry weight, phosphorus (P) and nitrogen (N) uptake, and net photosynthetic rate of walnut seedlings. Application of these two PSB strains also improved soil quality, as indicated by increased activities of dehydrogenase, neutral phosphatase, and urease in the soil. These increases were higher when PSB was applied together with RP. The most pronounced beneficial effects on plant growth and soil enzyme activities were observed when the three PSB strains were co-inoculated with RP. Bacillus cereus failed to promote plant growth. The results demonstrated that P. aurantiaca or P. fluorescens could be used as an environment-safe biofertilizer of walnut seedlings and other woody plants.

Download PDF

20 Downloads 1162 Views

a College of Forestry, Northwest A&F University, Yangling, 712100, Shaanxi, China
b College of Forestry, Sichuan Agricultural University, Yaan 625014, Sichuan, China
c College of Enology, Northwest A&F University, Yangling 712100, Shaanxi, China

* Corresponding author, E-mail: yx_9806@126.com

Received 9 Apr 2013, Accepted 22 Dec 2013