Abstract:

Modern compost technology was applied to realize reclamation of industry and agricultural waste, and the product (purified organic fertilizer) of it was used in circular economy way to build conservation-oriented fertilization mode of combining organic and inorganic fertilizers in citrus orchards. In this way, traditional economic system in which linear growth depended on chemical fertilizer consumption can be converted into the one in which linear growth depended on conservation-oriented agricultural circular economy. What’s more, research on effects of applying purified organic fertilizers in sloping-land citrus orchards was also conducted. It showed that compared with the result of applying 100% chemical fertilizer in citrus orchards (CK), the result of combining 80% chemical fertilizer and 20% organic fertilizer (T1), the result of combining 60% chemical fertilizer and 40% organic fertilizer (T2), and the result of applying 100% organic fertilizer (T3), respectively increased the citrus yields at 11.1%~18.4%, 13.0%~19.9% and 10.2%~18.2%. The combination fertilization mode of organic fertilizer and chemical fertilizer (mode T1 and mode T2) as well as mode T3 enable vitamin C content of citrus increased 23.4 mg/kg successively on average in 3 years; and the soluble sugar content of citrus increased 1.5 percentage on average. Considering economic and environmental effects, the economic benefit of T1 mode was the highest (55020 RMB/hm2), that of T2 mode and CK mode took the second and third place, and that of T3 mode ranks last. Value to cost ratio(VCR) of the four modes ranked as T1＞CK＞T2＞T3.