Key Technical Points for High-Quality and Efficient Fertilization Management of Shatian Pomelo
Shatian pomelo is a fruit of important standing in the fruit production of Xingning City. At present, the planting area has reached more than 30,000 mu, and the total output has reached more than 30,000 tons. Quite a number of farmers have already embarked on the road to prosperity by growing pomelo. In the long-term practice of planting Shatian pomelo, fruit growers in Xingning City have continuously experimented and summarized, and explored ways to improve the fruit quality of Shatian pomelo...
I. Fertilization management of young trees: 20-30 days after planting, apply topdressing in a timely manner according to seedling growth, but only thin Runtian bio-organic fertilizer, etc., may be applied to prevent damage to new roots. After that, apply topdressing 1-2 times per month, and the amount may be gradually increased. II. Fertilization management of fruiting trees
1. Heavily apply fruit-harvest fertilizer: around the Beginning of Winter to Light Snow (November), in combination with soil improvement and hole expansion, heavily apply fruit-harvest fertilizer to restore tree vigor as quickly as possible, promote flower bud differentiation, and accumulate nutrients for fruiting the following year. When expanding the holes, apply 8-15 jin of Runtian bio-organic fertilizer, 0.5-1 jin of phosphate fertilizer and an appropriate amount of nitrogen fertilizer per tree. According to the actual situation and tree growth vigor, 0.5% potassium dihydrogen phosphate may also be used for foliar topdressing at the same time, and 0.2% boric acid may be sprayed once to facilitate flower bud differentiation.
2. Shoot-strengthening fertilizer: apply a quick-acting fertilizer once in February-March, with 0.5-1 jin each of urea and phosphate fertilizer per tree. After spring shoots sprout, 0.5% potassium dihydrogen phosphate and 0.3% urea may also be used for foliar topdressing (spraying) to promote vigorous shoots and flowers. In early and mid-March, 0.3% urea and 0.5% potassium dihydrogen phosphate may be used respectively for foliar topdressing.
3. Fruit-setting fertilizer: in April-May, apply fertilizer as appropriate according to tree vigor and growth conditions, with 1-1.5 jin of compound fertilizer applied as topdressing per tree respectively. After mid-April, use 0.5% potassium dihydrogen phosphate for foliar topdressing. After flower drop, spray once each of 5ppm 24-D, 0.5% magnesium sulfate and 300ppm fruit-setting agent.
4. Fruit-strengthening fertilizer: in July-August, the fruit expands rapidly, and fertilization should mainly use organic matter fertilizer and quick-acting fertilizer. Apply 2-4 jin of Runtian bio-organic fertilizer and 0.6-1 jin of compound fertilizer per tree, and add half a jin of urea for old and weak fruit trees. According to tree vigor, increase the fertilization amount as appropriate when there are many fruits. When fertilizing, the method of opening radial trenches is generally used for topdressing, with the drip line of the canopy as the midpoint, trench length 0.5 m, depth and width 0.15 m each, and 8-10 trenches opened per tree. After fertilizing, cover with soil, and change the position each time trenches are opened.