Sha Tian Pu grapefruit high quality and efficient fertilization management technology

First, the fertilization management of young trees 20-30 days after planting, depending on the growth of seedlings in time to topdressing, but can only follow the thin application of Runtian bio-organic fertilizer, to prevent damage to new roots, after the top dressing 1-2 times per month, The amount can be gradually increased.

Second, the results of the tree fertilization management

1, re-apply fruit fertilizer: Before and after the beginning of winter to light snow (November) combined with soil expansion hole, re-apply fruit fertilizer, to restore tree vigor as soon as possible, promote flower bud differentiation, accumulation of nutrients for the second year results. When expanding the hole, each plant applies 8-15 pounds of bio-organic fertilizer, 0.5-1 pound of phosphate fertilizer, and appropriate amount of nitrogen fertilizer. According to the actual situation, the tree can be grown with 0.5% potassium dihydrogen phosphate and sprayed once. 0.2% boric acid for flower bud differentiation.

2. Shoot fertilizer: Apply 2-3 months of quick-acting fertilizer, applying 0.5-1 kg of urea and phosphate fertilizer to each plant. After the spring shoots are germinated, 0.5% of potassium dihydrogen phosphate and 0.3% of urea can be used for extra-root fertilizer application. (Spray) to promote strong shoots and flowers. In the early and mid-March, 0.3% urea and 0.5% potassium dihydrogen phosphate can be used to top-dress out.

3. Steady fruit fertilizer: Fertilizers can be fertilized according to the growth situation of the tree during April-May. Fertilizers should be fertilized at the rate of 1-1.5 pounds for each compound. After mid-April, 0.5% dipotassium dihydrogen phosphate should be used for dressing. One spray of 5 ppm 2,4-D, 0.5% magnesium sulfate and 300 ppm of rheopside was applied.

4, strong fruit fertilizer: July-August fruit rapid expansion, fertilizer should be organic fertilizer, quick-acting fertilizer-based. Each Shifentian biological organic fertilizer 2-4 kg, compound fertilizer 0.6-1 kg, old and weak fruit trees plus urea half a catty. According to the tree vigor, the amount of fertilizer should be increased as much as possible. When fertilizing, the open shot ditch is generally used to follow the method. The canopy dripping line is the midpoint. The length of the ditch is 0.5 meters, and the depth and width are 0.15 meters. Each ditch is 8-10 pieces. After fertilization, the soil is covered and each time the ditch is opened. Should change position.