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| DOI：10.13522/j.cnki.ggps.2024412 |
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| Effects of precision water and fertilizer management on yield, quality and resource use efficiency of asparagus lettuce |
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FANG Dawei, LIANG Bin, ZHOU Weiwei, LYU Haofeng, LU Qilin, CONG Wenfeng
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1. College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China;
2. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China;
3. College of Resources and Environmental Sciences, National Academy of Agriculture Green Development,
State Key Laboratory of Nutrient Use and Management, China Agricultural University, Beijing 100193, China;
4. Erhai Basin Academy of Agricultural Green Development Research, Dali 671000, China
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| Abstract: |
| 【Objective】Asparagus lettuce is widely cultivated in the Erhai Lake Basin. Based on a field experiment, this paper investigates the effects of precision water and fertilizer management on resource use efficiency, yield, and quality of the lettuce.【Method】The field experiment compared two irrigation methods: traditional irrigation that maintained soil moisture at 60%-95% of the field capacity, and precision irrigation that maintained soil moisture at 70%-75% of the field capacity. Each irrigation treatment was paired with a conventional fertilization (local practice) and a reduced fertilization. An intelligent in situ monitoring system was used to evaluate yield, quality, and resource use efficiency of the crop.【Result】Compared to traditional irrigation, precision irrigation increased the frequency of irrigation and fertilization by 40 and 41 events, respectively, reduced total irrigation amount by 21%, increased lettuce yield and water use efficiency by 18% and 49% respectively, and reduced nitrogen loss by 30%. Compared to conventional fertilization, reduced fertilization reduced nitrogen and phosphorus pentoxide application by 29% and 61%, respectively, without significantly affecting yield; it also increased dry matter accumulation and improved nitrogen and phosphorus use efficiency by 9%, 55% and 190%, respectively. Compared to the conventional approach, combining precision irrigation with reduced fertilization increased yield, nitrogen use efficiency, phosphorus use efficiency, and water use efficiency by 12%, 60%, 201%, and 42%, respectively; it also reduced nitrate content in the lettuce and nitrogen loss w by 19% and 53%, respectively.【Conclusion】Precision irrigation combined with reduced fertilization effectively reduces water and fertilizer inputs while enhancing resource use efficiency, yield, and quality of asparagus lettuce. It offers a promising agronomic practice for sustainable asparagus lettuce production in the Erhai Lake Basin. |
| Key words: water-fertilizer coupling; field water holding capacity; irrigation; soil nutrients |
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