In May, walnuts enter the stage of rapid fruit expansion and secondary shoots germination. The management focus is to meet the water and fertilizer supply of walnuts and reduce nutrient consumption to improve fruit setting and good fruiting rates, and lay the foundation for subsequent secondary shoot growth and flower bud differentiation . The following management measures should be taken: Appropriate top dressing, water once in early May, apply a high nitrogen, low phosphorus, and high potassium compound fertilizer to each plant in mid-May with a slightly dry soil (recommended ratio 22: 8: 16), dig a few 15 cm from the inside under the canopy Spread the deep ditch evenly and water after 5 to 7 days. To reduce nutrient consumption, one is to continue to cut off too many long branches, weak branches and non-bud shoots inside the tree, and wipe out too many weak shoots. The second is to properly thin out the single plant with excessive fruit setting, and focus on removing the inner bore branches. The thinning time is mid-May, and the leaf-fruit ratio is preferably 3 to 5: 1. The third is to continue to eliminate the sprouts of the real buds germinated by the high grafting tree that changed from bad to good last year. Slowing down and promoting flowering Continue to pull branches for long branches that are thrown away, so that the branches are evenly distributed and enhance the light; for late trunk strong trees in late May, trunk cutting is used to promote flowering. Before grafting, prepare a walnut tree that is highly grafted and optimized, and top off the 4 to 10 new shoots that are selected to grow to 30 to 40 centimeters to facilitate thickening. Pest control The leaf-eating insect chafer can be sprayed with gastric toxin + new high-fat film before evening; smoking insects such as Paramecium spp. And green leafhopper can be treated with scale dead + new high-fat film. For the rot and ulcer diseases that damage walnut branches, a knife can be used to scribe longitudinally at the diseased area, and the scratched part extends 2 cm deep to the xylem, and is coated with callus antiseptic film for prevention and treatment. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone ZHANGJIAGANG DINSHENGLIN TRADING CO.,LTD , https://www.dslhouse.com