First, to change the application of chemical fertilizers to increase the application of organic fertilizers, especially the more basic and alfalfa raft cake fertilizer and multiple organic-inorganic compound fertilizers, can not only meet the time needed for the growth of citrus nitrogen, phosphorus, potassium, and can also make up Magnesium, zinc and other trace elements, can better improve the acidity of the soil and soil bulk density, improve fertilizer utilization, prevent or correct citrus deficiency symptoms, improve the orange soil fertility, and thus increase citrus sugar.
Second, increase calcium fertilizer. According to studies, the acidity of oranges is related to the amount of calcium in the soil. The calcium content is high, and the acidity of citrus is relatively low, and vice versa. The orange soil of our city is mostly red soil, and the soil is acidic. Generally, the pH value is between 5.0-6.0, and calcium deficiency is common in the soil. For this reason, it is recommended that calcium fertilizer, such as quicklime, be added in the spring, which can effectively increase the calcium content in the soil, and at the same time, can supplement the calcium source needed for citrus growth. In spring each year, 50-60 kilograms of fresh lime are used in the orchard soil to reduce the acidity of the orange orchard soil.
Third, change the blind fertilization for soil testing and fertilization, due to different nutrient requirements for different growth stages of oranges, different levels of soil fertility in different orange orchards, through the determination of soil nutrients, symptomatic fertilization, due to lack of supplements, can effectively improve the citrus Orange quality and output, and can reduce the cost of fertilizer, to achieve cost-effectiveness.
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