What are the key technical points for summer management of kiwifruit?
1. Preventing wilting. Kiwifruit leaves wilt during the high temperatures of summer, mainly for two reasons: first, high temperature and drought, mostly occurring between 12 noon and 4 pm on sunny days, recovering in the morning and evening, usually occurring over large areas. When this happens, irrigate promptly in the morning and evening, and the wilting will be relieved. Second, the root system suffers from root rot, root-knot nematode disease, etc., which damages root function and causes pathological wilting. It is most severe at noon and lasts a long time; in severe cases symptoms also appear in the morning and evening, and it tends to occur sporadically. Once discovered, dig down to check the roots. If it is indeed caused by pests or disease, appropriately prune branches and leaves, remove some or all of the fruit, and use agents such as Nongkang 120 and Junlimie for root drenching.
1. Preventing wilting
Kiwifruit leaves wilt during the high temperatures of summer, mainly for two reasons: first, high temperature and drought, mostly occurring between 12 noon and 4 pm on sunny days, recovering in the morning and evening, usually occurring over large areas. When this happens, irrigate promptly in the morning and evening, and the wilting will be relieved. Second, the root system suffers from root rot, root-knot nematode disease, etc., which damages root function and causes pathological wilting. It is most severe at noon and lasts a long time; in severe cases symptoms also appear in the morning and evening, and it tends to occur sporadically. Once discovered, dig down to check the roots. If it is indeed caused by pests or disease, appropriately prune branches and leaves, remove some or all of the fruit, and use agents such as Nongkang 120 and Junlimie for root drenching.
2. Preventing sunburn
Sunburn is a common physiological disease of kiwifruit in summer. In addition to preventive measures such as irrigation during high temperatures, reasonable summer pruning, maintaining a suitable leaf-to-fruit ratio, and controlling the fruit load, spraying Meilin high-efficiency calcium twice during the young fruit stage (15-20 days apart) and bagging each exposed fruit individually can also effectively prevent sunburn.
3. Preventing shading
For trees in full fruit stage, neglecting bud thinning and applying excessive or heavy nitrogen fertilizer make the tree prone to excessive growth and shading. In summer, thin buds lightly and pinch tips heavily; for secondary shoots sprouting after the first pinching, leave 3-4 leaves, and for tertiary shoots leave 1-2 leaves and repeatedly pinch the tips. Open up the light path; for the outer branches on the trellis (the second wire outward) and fruiting branches, repeatedly pinch the tips at 2-3 leaves, and thin out vegetative branches. Shorten and thin out the weak fruiting branches and temporary fruiting branches that grow under the trellis. Remove old and yellow leaves. Through the above measures, achieve a high-yield orchard appearance of "no tangling on the tree, a gap between rows, flower shadows under the tree, and sunlight on every branch."