The sugar content of Zhangzhou mandarin is not lower than that of sugar orange, but the acidity is higher than that of sugar orange, and the acidity is heavier. At present, it is the key period for citrus fertilization, so that citrus should be reduced in acid and sugar, and fertilizer should be applied first. So how do you fertilize citrus?
　　 First, the application of chemical fertilizers to increase the application of organic fertilizers, especially the application of alkaline hibiscus cake fertilizer and multi-organic inorganic-inorganic compound fertilizer, can meet the nitrogen, phosphorus and potassium required for citrus growth in time, and can complement Magnesium, zinc and other trace elements can improve the acidity and soil bulk density of the land, improve the fertilizer utilization rate, prevent or correct the symptoms of citrus deficiency, improve the soil fertility of the orange garden, and thus increase the citrus sugar content.
　　 Second, increase the application of calcium fertilizer. According to research, the acidity of citrus is related to the calcium content in the soil, the calcium content is high, the acidity of citrus is relatively low, and vice versa. The soil of the orange orchard in our city is mostly red soil and the soil is acidic. The general pH value is between 5.0 and 6.0 , and the soil is generally deficient in calcium. To this end, it is recommended to add calcium fertilizer such as quicklime in the spring, which can effectively increase the calcium content in the soil and at the same time make up the calcium source needed for citrus growth. In the spring of each year, 50-60 kg of quick lime per acre is applied to the soil of the orange orchard to reduce the acidity of the orange orchard soil.
　　 Third, change the blind fertilization for soil testing and fertilization, because the nutrients required for different growth periods of citrus are different, and the soil fertility levels of different orange orchards vary. By measuring the nutrients in the soil, symptomatic fertilization, lack of filling, can effectively improve the mandarin Orange quality and yield, and can reduce the cost of fertilizer, to achieve cost-effective.
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