关键词: 设施苋菜, 化肥减施, 有机肥替代, 产量, 品质

Abstract: Aiming at the excessive application of chemical fertilizers in the production of facility leafy vegetables, the effects of four fertilizer reduction techniques on amaranth yield and quality in Wuhan were studied. The fertilizer reduction techniques included soil testing and formulated fertilization（T2）, organic fertilizer substituting chemical fertilizer（T3）, organic small molecule water soluble fertilizer substituting chemical fertilizer（T4） and fertigation technology（T5）. The results showed that T4, T3, T2 and T5 treatments increased yield by 10.59%, 4.07%, 2.36% and 5.06% per hectare compared with farmers’ conventional fertilization （T1 treatment）. Compared with conventional fertilization, the contents of soluble sugar, protein and VC of different fertilizer reduction techniques were significantly increased, while the content of nitrate was decreased. The nutritional quality of Amaranth in T3 and T4 treatments was the best. In terms of cumulative nitrogen, phosphorus and potassium uptake of Amaranth, T4 treatment was significantly higher than T1 treatment, T3 and T1 treatments had no significant difference, T2 and T5 treatments were significantly lower than T1 treatment. The above results indicated that under the conditions of this experiment, organic small molecule water-soluble fertilizer substitution technology had the best effect of reducing fertilizer application and increasing efficiency.

Key words: amaranth in greenhouses, reducing chemical fertilizer, organic fertilizer replacement, yield, quality