| Effects of bio-organic fertilizer on bioactivity and root activity of rhizosphere soil of potato |
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| DOI：10.7606/j.issn.1000-7601.2019.03.21 |
| Key Words: biological organic fertilizer potato rhizosphere soil microorganism root activities pot experiment |
| Author Name | Affiliation | | QIU Xiao-li | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHOU Yang-zi | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DONG Li | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Chun-hong | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Zhi-long | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG You-ling | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | QIU Hui-zhen | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The long-term application of a large amount of chemical fertilizer to potato field can cause the decrease in soil bio-activity. To solve this problem, we studied the effect of the bio-organic fertilizer with the selected plant growth promoting rhizobaeteria (PGPR) on the soil bio-activity. The treatments included no fertilizer (CK), chemical fertilizer (CF), ordinary organic fertilizer (OF), and five biological organic fertilizers (BOF1, BOF2, BOF3, BOF4 and BOF5) on the bioactivity and root activities of potato rhizosphere soil through a pot experiment. The result showed that during the potato maturity period, the five types of bio-organic fertilizer treatments increased cultivable bacteria by 52% and 37% on average and microbial biomass carbon by 30% compared with the CF and OF treatments. The increase in cultivable bacteria and microbial carbon of BOF3 compared with that of other biological organic fertilizers was 3% to 7% and 2% to 7%, respectively. Soil urease, sucrase, and phosphatase activities also increased significantly (P<0.05). Compared with that of the CF and OF treatments, the increase of enzyme activities was 11%~114%. The root activities and tuber yield also increased with the improvement of soil biological activities. The most significant effects was with BOF3, compared with CF and OF, the root activities of the five bio-organic fertilizers increased by 265% and 224%, respectively, and the tuber yield increased by 16% and 21%. The root activity of BOF3 was 166% higher than that of BOF5. The tuber yield of BOF3 was higher than that of other biological organic fertilizer treatments by 5% and 9%, respectively. It indicated that increase in the number of cultivable bacteria and actinomycetes resulted from biological organic fertilizers increased the biomass carbon (nitrogen) and enzyme activities of the soil, thus improved the biological activity of the soil，created a favorable rhizosphere environment for potato roots, and consequently improved the root vitality and promoted the growth of the potato. |
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