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| DOI：10.13522/j.cnki.ggps.2021164 |
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| The Effects of Irrigation with Diluted Biogas Slurry on Growth, Yield and Fruit Quality of Tomato |
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ZHENG Jian, ZHU Chuanyuan, QI Xingyun, WEI Jiafang, YANG Shaohong, SUN Qiang
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1.College of Energy & Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2.Key Laboratory of the System Biomass Energy and Solar Energy Complementary Energy System, Lanzhou 730050, China;
3.Western energy and Environment Research Center, Lanzhou University of Technology, Lanzhou 730050, China
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| Abstract: |
| 【Objective】Irrigation is an environment-friendly way to treat liquid wastes of biogas digesters, but how to reduce its detrimental impact on soils and improve the use of its nutrients is critical to its sustainable application in agricultural production. The purpose of this paper is to study the impact of irrigation with diluted biogas slurry on growth, yield and fruit quality of tomato.【Method】 The experiment was conducted in a greenhouse. Biogas slurry was diluted by freshwater at volumetric ratio of 1/4; it was then used to irrigate the crop at one of the following growth stages: seedling stage (P1), blooming and fruiting stage (P2), fruit expansion stage (P3) and fruit ripening stage (P4). Irrigation with freshwater was taken as the control (CK). For each treatment, we measured the growth physiology, nutritional quality of the fruits, as well as sugar accumulation.【Result】Irrigation with the diluted biogas slurry promoted growth, dry matter accumulation, yield and fruit quality of the tomato. Compared to P0, P2 and P3 increased the leaf area index by 48.32% and 36.89%, respectively, P3 accumulated more than 47.18% of the dry fruit-biomass. In addition, P3 also increased soluble sugar, titratable acid, sugar-to-acid ratio in the fruit, as well as fruit hardness most; and P2 improved vitamin C and soluble solids most significantly, compared to P0. Comprehensive benefit evaluation shows that fruit expansion was the key period for yield formation and fruit quality, keeping soil water and nutrients sufficient in which is hence essential. During the fruit ripening stage, the crop did not respond to irrigation and fertilization as noticeably as it did in other growing stages.【Conclusion】The optimal irrigation for greenhouse tomato is to dilute the biogas slurry with freshwater at 1∶4 volumetric ratio, and irrigate the crop at the fruit ripening stage. |
| Key words: tomato; biogas slurry; growth stage; analytic hierarchy process; entropy method; TOPSIS |
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