First, the significance of fruit tree fertilization in autumn is: 1. It is conducive to restoring tree vigor. After the harvest, the fruit trees will be top-dressed in the fall, which will be able to supplement the nutrients of the tree in time, promote rooting and restore the tree vigor. 2, is conducive to improving soil structure and fertility. The orchards in mountainous and hilly areas are generally thin in soil and low in organic matter content. Fertilization in autumn is beneficial to improve soil water conservation and fertility conservation. 3, help to enhance the ability of the body 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 rooting and the number of hairy roots are numerous. In addition, the green-pressing materials for fertilization in autumn are rich, and the excavation is also relatively easy. Into some of the nitrogen, phosphorus, potassium available fertilizer, is conducive to the accumulation of nutrients in the tree, increase the concentration of tissue cells, enhance the ability to prevent freezing and cold. Second, the fertilization in autumn must master the following several technical points: 1, autumn basal fertilization than winter basal fertilization 2 to 3 months in advance, should be immediately after the picking fruit garden. 2. In autumn, basal fertilizer should be dominated by organic fertilizers and supplemented by chemical fertilizers, so that the combination of soil and support can be improved, and the delayed effects and quick effects can complement each other. The application of fertilizers should pay attention to the proportion of nitrogen, phosphorus, and potassium fertilizers, and 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 were applied with 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 per plant. 3, fertilization method can be used trench method can also be used disk method. When the ditch is applied, a fertilization ditch such as a circle, 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. Spread the dry fertilizer in the ditch after watering, and cover the soil immediately after the water is dry. Before fertilizing, the roots exposed in the trenches should be leveled along the trench walls. Cuts must be smoothed to prevent root mold from decaying. When fertilizing, the fertilizer should be applied layer by layer. The coarse fat such as leaves and weeds should be placed on the bottom layer. The top layer should be filled with organic fertilizer. Each layer of fertilizer should be coated with a layer of soil. Finally, the fertilizer should be 25-30 cm above the ground. Due to the staggered distribution of adult roots in orchard soils, a disk method can be used to split the topsoil along the plant spacing or row spacing on one side of the plant, and shallow (8–10 cm) near the trunk at the time of eucalyptus, farther from the trunk. Should be deep (40-60 cm), then apply dry fertilizer and then cover the soil. (Source: "Rural Science, Technology and Information", Issue No. 2004.7)
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