| Effects of long\|term fertilization on soil quality and millet yield on slope farmland in loess hilly areas |
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| DOI：10.7606/j.issn.1000-7601.2021.05.10 |
| Key Words: long\|term location fertilization combined application of nitrogen and phosphorus soil quality soil enzyme activity millet grain yield |
| Author Name | Affiliation | | GAO Xiaofeng | State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China | | YAN Benshuai | University of Chinese Academy of Sciences, Beijing 100049, China | | WU Chunxiao | State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China | | WANG Guoliang | State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Based on the long\|term positioning experiment of sloping farmland ecosystem (1995-2019), bare land (LD), control (CK, no fertilization), single application of nitrogen fertilizer (N1,N2: urea 55.2 kg·hm-2 and 110.4 kg·hm-2), and combined application of nitrogen and phosphorus (N1P,N2P: urea + superphosphate 55.2+90 kg·hm-2 and 110.4+90 kg·hm-2) of 6 treatments were designed to research the effect of long\|term fertilization on soil quality and millet yield. The results showed that: (1) Compared with CK, the long\|term single application of nitrogen fertilizer increased the soil alkaline nitrogen content by 24.81%~39.92%. The long\|term combined application of nitrogen and phosphorus fertilizers increased the soil organic carbon, total phosphorus, alkaline nitrogen, and available phosphorus content by 7.82%~16.81%, 58.18%, 21.59%~22.89%, and 450.5%~660.3%, and the soil pH decreased by 0.04~0.08 units. (2) Compared with CK, long\|term single application of nitrogen fertilizer alkaline phosphatase (AP) enzyme activity increased by 13.34%~19.43%. In the long\|term nitrogen and phosphorus balanced fertilization soil, the enzyme activities of β-1,4-N-acetylglucosaminidase and leucine aminopeptidase (NAG+LAP), and glucosidase (βG) were significantly increased by 16.76%~71.01%, 47.12%~59.94%, respectively. Planting millet significantly increased the activities of βG, LAP+NAG, and AP by 68.74%~342.42%. The stoichiometric ratio of enzyme in N1P treatment was closest to the steady state of 1∶1∶1. (3) Compared with CK, the biomass and yield of millet under N1P treatment increased by 105.25%~230.05%. The yield of millet was significantly positively correlated with soil total phosphorus and available phosphorus, and significantly negatively correlated with soil pH. In short, long\|term fertilization significantly improved the soil quality and millet yield of slope farmland in loess hilly areas, and the best outcome came from low nitrogen and phosphorus combined application (N1P). |
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