First, the type of winter fertilizer application:
1. It is mainly based on the application of fully decomposed organic fertilizer. Generally, organic fertilizer should account for 60-80% of the total fertilization amount. 50-100 kg of manure and fertilized manure per adult tree, 50-100 of decomposed turf soil. kg.
2, reasonable mix with NPK fertilizer, each adult fruit tree, while applying crop straw fertilizer, garbage, pond mud and other organic fertilizers, the plant applied 1.5 kg of bean cake, 1.5 kg of orange cake, 1.5 kg of phosphate fertilizer, 0.5 kg of urea Lime 1.5 to 2 kg.
3. Apply micro-fertilizer according to local conditions, and supplement various trace element fertilizers necessary for citrus according to soil structure, fatness and fertilization environment. The mountain orange groves of red and yellow loam are all acidic, and the contents of zinc, magnesium, manganese and boron are low. The calcareous purple soil and the coastal saline-alkaline soil orange orchard have lower effective iron, zinc and manganese. Excessive application of nitrogen fertilizer can also cause the lack of elements such as magnesium and zinc. Therefore, for different conditions of the orange garden, in the application of winter fertilizer, symptomatic application should be done to supplement the deficiency of trace elements.
Second, the fertilization method:
1. Radial groove fertilization: According to the size of the canopy, 4 to 6 groove grooves are opened in the direction of horizontal root growth. The bottom of the groove is shallower near the trunk, and the extension to the crown projection is deeper. With this method, the fertilizer has a wide distribution surface, and the fertilization site can be replaced every year to expand the fertilization surface and promote root absorption, especially suitable for the application of adult citrus orchards.
2. Drill a solitary or circular deep groove along the canopy. The depth of the ditch is about 50 cm. The width of the ditch depends on the amount of fertilizer. The topsoil and the subsoil should be piled up separately when digging trenches. The decomposed organic fertilizer or micro-fertilizer is applied to the lower layer, and the nitrogen fertilizer is placed on the upper layer. In the flat ditch, fill in the fertile topsoil and fill the subsoil on the surface.
Third, winter fertilizer application time:
It is best to finish in mid-December. Before the application of ice, it is best to use the 0.4% urea plus 0.3% potassium dihydrogen phosphate to carry out two external top dressings.
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