Abstract
Increasing organic fertilizer application can improve the sustainability of soil productivity, but the effects of increased organic fertilizer application with reduced chemical fertilizer application over different time periods on chemical properties and bacterial community of grape rhizosphere soil in an arid region are not clear. In this study, three years of fixed-point field tests were used to compare the effects of various fertilization treatments on the soil properties and bacterial community in the grape rhizosphere. The results showed that (1) T1 and T2 significantly increased SOM, AN, AP and AK contents in grape rhizosphere soil. TN, TP and TK contents in grape leaves of T2 were the highest of those in five fertilization treatments. (2) The abundances of Proteobacteria and Bacteroidetes phyla and especially of Arthrobacter, Pseudomonas, Nitrosopira and Bacillus genera were higher in T2 than in the other samples. (3) SOM, AP and AN contents in soil were the main factors affecting soil bacterial community and mineral element contents in grape leaves and roots according to an RDA analysis. In summary, the application of organic fertilizer with reduced chemical fertilizer for two years had the greatest impact on the soil properties and bacterial community of the grape rhizosphere soil.
Highlights
Increasing organic fertilizer application can improve the sustainability of soil productivity, but the effects of increased organic fertilizer application with reduced chemical fertilizer application over different time periods on chemical properties and bacterial community of grape rhizosphere soil in an arid region are not clear
The soil conductivity in T2 and T3 were significantly lower than that in CK and T0 (P < 0.05), and soil conductivity in T2 decreased by 31.10% and 24.24% compared with CK and T0, respectively
We found that on days 15 and 75 after anthesis, the increased organic fertilizer with reduced chemical fertilizer treatments for one and two years led to the contents of soil organic matter (SOM), AK and available phosphorus (AP) being significantly higher than those of unfertilized and typical chemical fertilization
Summary
Increasing organic fertilizer application can improve the sustainability of soil productivity, but the effects of increased organic fertilizer application with reduced chemical fertilizer application over different time periods on chemical properties and bacterial community of grape rhizosphere soil in an arid region are not clear. Three years of fixed-point field tests were used to compare the effects of various fertilization treatments on the soil properties and bacterial community in the grape rhizosphere. The application of organic fertilizer with reduced chemical fertilizer for two years had the greatest impact on the soil properties and bacterial community of the grape rhizosphere soil. There are few reports on the persistent effects of organic and chemical fertilizers on soil properties or on rhizosphere microbial communities in arid regions For these reasons, this study used ‘Summer Black’ grapes as research material, through three years of fixed-point field tests to compare the effects of various fertilization treatments (no fertilizer, a typical chemical fertilizer, increased organic fertilizer and reduced chemical fertilizer for one year, two years and three years) on the soil properties and the grape rhizosphere bacterial community structure. Our aim was to provide a theoretical basis for the scientific fertilization of grapes in the field
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