There was more rain this spring, and it suffered a "cold spring". Therefore, it is critical to do a good job in citrus spring training.
First, drain the drain. Spring rain, orange soil water content is too large, it will lead to poor soil ventilation, affecting the growth and development of citrus, therefore, to do a good job in the Qingyuan drainage citrus work; Slope of Orangery, should open a good ditch and fall into the ditch; For the Orange Park in Pinghu District, where water is easily stained, it is necessary to strengthen the work of clearing the ditch and drain water, and to open up the Xianggou, Weigou and Shuigou ditch, and pay attention to keeping the “three ditch†unobstructed.
Second, weeding weeding. The citrus rhizosphere needs good permeability. In general, the 2-3 years deep plowing in the citrus orchard should be used for cultivating the orange soil once in sunny days. The cultivating depth should be about 25cm. However, the surrounding and nearby areas should be ploughed and the main root and roots should not be damaged. Other areas when deep plowing. In combination with cultivator, the dead branches, weeds, pests and branches in the park were completely removed and brought out of the park and burned.
Third, chase fertilizer materials. For citrus groves that have a large amount of fruit or are weakly grown in the past and have not applied “fruit-fertilizer†in the past year, fertilizers should be recovered as early as possible before mid-March. Fertilization should be based on surface fertilization and supplemented with foliar dressing. The amount of ground fertilizer is 1 to 1.5 kilograms per plant, and the growth potential is normal and less applied. Fertilizer application should be based on bio-organic or citrus-specific fertilizers, but no chlorine-containing compound fertilizers. The fertilization method changed the past cave facilities to spreading: spread the trees within 80cm from the middle of the tree and between the rows within 1 to 2 days before the middle rain, and it should not be applied before the heavy rain to prevent the loss of nutrients. For foliar spraying, 0.3% urea plus 0.2% potassium dihydrogen phosphate should be used, and other foliar fertilizers that have proved to be effective in fertilizer application can also be used. Acid soil combined with cultivator loose soil 150kg of lime per acre. Application of lime can supplement calcium nutrition, can neutralize soil acidity, can inhibit pests and diseases, and is conducive to high quality and high yield of citrus.
Fourth, plastic trim. Good ventilation and light conditions are required inside the citrus orchard. For the citrus groves that were not trimmed in the clear or pruned in the last winter, a pre-emergent pruning should be carried out in March. The principle of pre-emergent pruning is “simplification of pruningâ€, that is, it should be rough and not suitable for thinning. The main branch pruning technique is to saw a central upright branch with large shading in the canopy. In addition, cross-branches are left to stay one, saw (scissors) in addition to pests with severe damage and dead (dead) branches and piles. The densely growing branches in the canopy should be properly removed, and the branches extending beyond the crown should be shortened. The pruned branches brought out of the park and burned. For cuts (saws) with larger cuts, the lighted surface should be flattened and coated with a protective agent or coated with a thin film.
Fifth, pest control. For those who did not have a clear garden in the last winter, in the end of March, they should generally spray once a 1 degree Baume sulfur mixture, or 40% crystal lime sulfur 80 times. In addition, pay attention to prevention and control of flower buds, spider mites, leaf miners, anthrax, scab and other pests and diseases.
Sixth, the transformation of poor quality and low-yield gardens. The orange groves with a tree age of more than 30 years, debilitating or near death, less than 500 kg per mu, and inferior quality of the orange groves; mixed planting varieties, with an average yield per mu of less than 1500 kg in the past three years. From March to April, the use of deep-turning soil, re-application of organic fertilizer, crown change crown, transfer to thinning, high graft change, destroy the garden replanting and other measures to carry out low-quality and low-yield garden transformation.
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