| Effects of bioactive agents on apple orchard in Eastern Gansu Area |
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| DOI：10.7606/j.issn.1000-7601.2022.04.10 |
| Key Words: apple fertilizer reduction bioactive agents soil nutrients tree growth yield quality |
| Author Name | Affiliation | | HU Huatao | College of Horticulture, China Agricultural University, Beijing 100193, China | | FEI Libin | College of Horticulture, China Agricultural University, Beijing 100193, China | | DENG Mingjiang | College of Horticulture, China Agricultural University, Beijing 100193, China | | WANG Yi | College of Horticulture, China Agricultural University, Beijing 100193, China | | XU Xuefeng | College of Horticulture, China Agricultural University, Beijing 100193, China | | HAN Zhenhai | College of Horticulture, China Agricultural University, Beijing 100193, China |
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| Abstract: |
| To explore the effects of applying bioactive agents on fertilizer use efficiency, an experiment on improving the quality and efficiency of chemical fertilizer were carried out in apple orchards in eastern Gansu area for 2 years. The effects of reduced application of chemical fertilizer on orchard soil fertility, tree growth and development, apple yield and quality were studied. Two treatments of conventional fertilization (CK) and conventional fertilization combined with bioactive agents (B) were set up in G1 and G2 orchards in 2018., and G3 and G4 orchards were added in 2019. Treatments were as follows: conventional fertilization (CK), conventional fertilization combined with bioactive agents (B), 30% reduced application of chemical fertilizer combined with bioactive agents (RB), and reduced application of chemical fertilizer 30% (R). The results showed that after the application of bioactive agents (B) in 2018, the contents of soil total nitrogen and available phosphorus in G1 and G2 orchards decreased, while the nitrogen content in leaves increased by 11.2% and 4.9%. Compared with the control group, the flower bud quantity of the tree increased by 65% and 45% respectively, the titratable acid content of the fruit decreased, and the fruit aroma increased. After reducing the application of chemical fertilizer by 30% (R), the pH value of the soil was reduced, and the nitrogen content of leaves increased except G1 orchard, in which G2 and G3 increased by 6.9% and 12.9%, respectively. The yield of G1 and G3 orchards increased by 35.8% and 40.6%, respectively, but it had a different effect on the young orchards with less fertilizer application. The results of 30% reduced application of chemical fertilizer combined with bioactive fertilizer showed that the content of soil total nitrogen and available phosphorus decreased slightly except G4, and the leaf nitrogen content increased by 15.0%, 6.4% and 3.0% respectively except G2 orchard, and the performance of other trees was better than that of 30% reduced chemical fertilizer treatment (R). In summary, the application of bioactive agents in orchards in Longdong area significantly promoted the flowering of young trees and improve the fruit aroma. Overall, the reduced application of chemical fertilizer had no effect on the fruit quality of mature trees. Therefore, this management technology should be selectively used in this area to achieve the purpose of reducing the application of chemical fertilizer and increasing fertilizer utilization efficiency. |
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