ABSTRACT
Study site was located at Xinmin City, Liaoning Province, located Damintun vegetable production base, Xinmin City, Liaoning Province, belonging to Liaohe alluvial plain.
According to the survey, Damintun greenhouse vegetables are mainly used in organic fertilizer chicken manure and compost manure, some farmers also use compost manure, the use of organic fertilizer per year is about 80-110 t ⋅ hm−2, urea is about 500 kg ⋅ hm−2 or (NH4)2SO4 about 1000 kg ⋅ hm−2, (NH4)2HPO4 1000-1500 kg ⋅ hm−2, K2SO4 about 1000 kg ⋅ hm−2, or 1200-1400 kg ⋅ hm−2 three elements of fertilizer, and with three main elements of fertilizer for top dressing fertilizer.
