Summary
Highlights Application of biogas slurry can significantly improve the integrated growth, yield, quality of tomatoes. Water-nitrogen coupling model was established based on multi-index evaluation system of tomatoes. The optimal application quantitative range of water and nitrogen was obtained based on the water-nitrogen coupling model. Abstract. Biogas slurry, a liquid organic fertilizer, has been widely used in agricultural production. However, the characteristics of high water content and low fertility make it always applied empirically and a scientific and reasonable application of biogas slurry is urgent needed in practical agricultural production. This study aims to explore the effects of various biogas slurry concentrations on the yield, comprehensive nutritional quality (CNQ), irriga
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