Chinese chestnut to be high-yielding, early spring topdressing is fastidious!

Chinese chestnut is known as "king of dried fruit". As an economic forest crop, Chinese chestnut has expanded its economic sources for mountain farmers and become one of the channels for some mountain farmers to get rich, but if Chinese chestnut wants to have a high yield, topdressing in early spring is very important!

The main points of base fertilizer of Chinese chestnut

Chestnut needs a large amount of fertilizer, and rational fertilization is an important basis for high yield of chestnut orchard. Base fertilizer should be based on soil and miscellaneous fertilizer, in order to improve soil, improve the ability of soil fertilizer and water conservation, and provide more comprehensive nutrient elements.

In order to plant chestnut trees on flat land and gentle slope, it is necessary to dig a pit with a length and width of 0.8m and 1.0m, and a depth of about 0.5m. In each pit, fully mixed mature organic fertilizer 50~100kg, urea 0.5~0.6kg and calcium phosphate 0.4kg were applied. For the soil with low boron content, 10-15g boron fertilizer should be applied to each hole as base fertilizer.

Second, the main points of chestnut dressing

1. Type of topdressing

The topdressing of chestnut is mainly composed of available nitrogen fertilizer, combined with phosphorus and potassium fertilizer.

2. Topdressing time

The time of topdressing is in early spring and summer. In spring, urea 0.3~0.5kg is applied to each tree of the first planting fruit tree, and urea 2kg is applied to each tree in the full fruit stage. After catching up, it should be combined with watering to give full play to the effect of fertilizer.

Summer topdressing is carried out from late July to mid-August, when the application of available nitrogen and phosphorus fertilizer can promote fruit grain enlargement, pulp fullness and improve fruit quality.

3. Times of topdressing

Extra-root topdressing can be carried out many times a year, and the key point is to do well twice.

For the first time, when the basal leaves of branches changed from yellow to green in early spring, 3~5g/kg urea plus 3~5g/kg borax was sprayed to promote the basic leaf function, improve photosynthesis and promote the formation of canned flowers.

The second time was 30 days before harvest, spraying 1g/kg potassium dihydrogen phosphate twice every 10 to 15 days, the main function was to improve photosynthetic efficiency, promote the transfer of nutrients from leaves and other organs to the fruit, and significantly increase the single grain weight.

Third, why should Chinese chestnut be fertilized before harvest?

Chinese chestnut has a long fruit hanging period, a large amount of fruit and a lot of nutrients. Before and after fruit ripening, the tree potential has been in a state of hunger and semi-hunger, which is very weak, which is disadvantageous to blossom and fruit in the second year. If we can timely apply pre-harvest and postharvest fertilizer and supplement nutrients, it can speed up the recovery of tree potential, promote strong tree potential, and lay a good foundation for high and stable yield in the second year.

The postharvest fertilizer was applied within 5-10 days after fruit harvest of Chinese chestnut, mainly nitrogen, phosphorus and potassium compound fertilizer and high quality organic fertilizer. if the weather was dry, each tree was drenched with water or retted to produce mature human and animal manure water 80kg 100kg, in order to promote fertilizer dissolution and transformation, supply root absorption and utilization, and improve the effect of fertilization.