Effects of Replacing Chemical Fertilizers with Bio-organic Fertilizers on Microenvironment of Wheat Rhizosphere Soil

doi:10.7668/hbnxb.20191894

Abstract

Abstract: To study the effect of replacing chemical fertilizers with bio-organic fertilizers on the biological characteristics of wheat rhizosphere soil and yield, field experiments were conducted to study the effects of organic substitution of chemical fertilizers on wheat rhizosphere soil nutrients, soil enzyme activities, rhizosphere soil bacterial community structure and wheat yield, by the use of physiological and biochemical means, high-throughput sequencing technology and yield survey. The results showed that bio-organic fertilizer reasonably replaces chemical fertilizers, soil nutrient contents and enzyme activities had an increasing trend, and chemical fertilizer reduction 10%+biological organic fertilizer treatment had the best effect. Compared with conventional fertilization, soil organic matter(SOM) and total nitrogen(TN), available phosphorus(AP), available potassium(AK) content and soil urease(S-UE), invertase(S-SC), neutral phosphatase(S-NP) activities increased by 17.4%, 12.4%, 16.2%, 19.2% and 19.0%, 9.7%, 18.3%, respectively. High-throughput analysis found that after bio-organic fertilizers replaced 10% and 20% chemical fertilizers, Sphingomonas, Lysobacter, Nitrospira, Massilia and other functional bacteria with biological control and growth-promoting effects significantly enriched.Redundancy analysis(RDA) showed that environmental factors were closely related to the bacterial community structure in the rhizosphere soil. After replacing 10% and 20% chemical fertilizers with bio-organic fertilizers, wheat production increased by 9.3% and 4.4%, respectively. Therefore, the reasonable substitution of bio-organic fertilizers for chemical fertilizers can increase soil enzyme activities and soil nutrient content, and enhance the sustainable productivity of the soil. It is the main means to change the current high-input and high-polluting agricultural production methods.

Key words: Wheat, Microbial fertilizer, Rhizosphere soil, Soil enzyme activities, Bacterial community structure

CLC Number:

S143
S141

WANG Junhong, WANG Xinglin, WANG Kang, REN Zhenxing, WANG Mengliang. Effects of Replacing Chemical Fertilizers with Bio-organic Fertilizers on Microenvironment of Wheat Rhizosphere Soil[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(4): 155-162. doi: 10.7668/hbnxb.20191894.

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