Technical Mode of Reduction and Synergism for Citrus Chemical Fertilizers and Pesticides Application in Guangdong

Guangdong is an important citrus production area in China, and the citrus industry is seriously affected by the disease Huanglongbing. In the citrus production, fruit growers are highly dependent on the input of chemical fertilizers and pesticides. In recent years, with the improvement of citrus varieties and the optimization and adjustment of industrial structure, the cultivation technology level of citrus has been increasing year by year, but there are still some problems, such as excessive fertilization, unreasonable fertilization, extensive management, pesticide abuse, low utilization rate of fertilizers and pesticides, which have brought about ecological environmental pollution and citrus fruit quality and safety. Currently, the application amounts of chemical fertilizer and pesticide in citrus production areas in Guangdong are high, and the ways of application are unreasonable, which have great potentials for reduction and improvement. In order to improve the current situation of fertilizers and pesticides application in citrus production areas in Guangdong province, according to the idea of "scientific application amount, substitution reduction, synergistic increase"of scientific application amount in citrus orchard, through the selection, integration and demonstration of key technologies in the field for many years, and the optimization and integration of related supporting measures, a technical mode of reduction and synergism for citrus fertilizers and pesticides application in Guangdong province was established. The technical model formulated the key technical points of the integration of water and fertilizer, the substitution of organic fertilizer for chemical fertilizer, accurate detection and prediction of diseases and insects, the coordinated control of multiple diseases and insects in the same suitable period, the rational application of synergistic agents, and the weeding by ground cover, which has been applied and promoted in citrus production areas in Guangdong, effectively reducing the dosages of chemical fertilizers and pesticides, and achieving good results in the prevention and control of main diseases and insects, yield and quality. It provides scientific technical supports for the healthy and sustainable production of citrus in Guangdong.