Many experienced fruit growers believe that the fruit trees should be high-yielding, and autumn fertilizer is the key; Fertilization in autumn has the following benefits: The first is to help restore the tree vigor. Second, it helps to improve soil structure and fertility. In particular, orchards in mountainous and hilly regions are generally thin in soil and low in organic matter content. Fertilization in autumn is beneficial to improve soil water conservation and fertility conservation. Again, it is beneficial to enhance the ability of the tree to prevent freezing and cold. After the fall, the soil temperature is generally around 20°C, so the root-cutting wounds of the digging hole are easy to heal, and the long roots and the number of hairy roots are abundant. In addition, the green materials for autumn fertilization are rich and easy to excavate. Autumn fertilization must master the following technical points: 1. Autumn basal fertilization should be 2 to 3 months ahead of winter basal fertilization, and should be carried out immediately after picking fruit and clear gardens. 2. Autumn Schiff base fertilizer should be dominated by organic fertilizer, supplemented by chemical fertilizers, so that the combination of improved soil and support, delays and complementary effects. The application of fertilizers should pay attention to the proportion of nitrogen, phosphorus and potassium fertilizers, it is not appropriate to use too much available nitrogen fertilizer, otherwise it is easy to cause winter shoots. At the same time, it is necessary to apply trace elements in a targeted manner. The mature fruit trees use 60-80 kg of organic fertilizer, 150 g of urea, 3-4 kg of superphosphate or calcium magnesium phosphate, and 0.5 kg of potassium sulfate. 3. Fertilization method can be used trench method, but also available disk method. When the ditch is applied, a fertilization ditch such as a ring, a rectangle, or an arc is formed at the position of the canopy drip line, and the ditch depth is 40-50 cm. The width of the ditch should be determined depending on the amount of fertilizer, and the ditch should be flat. After the water is sprayed, the fertilizer will spread in the ditch and the soil will be covered immediately after the water is dry.
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