Although summer is typically a season with abundant rainfall, unpredictable weather patterns—such as alternating dry and wet periods—can still occur. As a result, it's essential to irrigate seedlings promptly during dry spells. During the fast-growing phase of seedlings, frequent and thorough irrigation should be applied in large quantities. However, in the later growth stage, irrigation is usually unnecessary unless there is extreme drought. Before the rainy season begins, all drainage systems within the nursery must be properly maintained to ensure efficient water runoff and support healthy seedling development. In case of flooding, ditches should be cleared immediately to remove standing water and debris, and seedlings should be repositioned so that water can drain freely, helping them regain their vitality.
Weeding is a common task in nurseries during the summer. After every irrigation or rainfall, weeding and soil loosening should be carried out. The principle of "weeding early, weeding small, and weeding thoroughly" should be followed. Soil loosening should be done gradually, ensuring that it is deep and thorough without damaging the seedlings or pressing them down. For densely planted seedlings, manual removal of weeds between plants is recommended. A thin layer of fine soil should be spread on the surface of the seedbed to prevent root exposure and promote better growth.
Some tree species may develop lateral shoots at the seedling stage due to factors like climate, soil conditions, and genetic traits, which can hinder the development of strong, straight stems. To address this, timely bud and shoot pruning is necessary to reduce lateral root formation and improve seedling quality.
During the summer, applying quick-release fertilizers between the rows of seedlings can enhance growth. The depth of the fertilizer trench should be appropriate, and the fertilizer should be placed in the trench and covered with soil. Top-dressing should be done when seedlings are actively growing lateral roots, preferably after 3 p.m. It’s important to avoid applying concentrated fertilizer directly onto tender shoots. Different seedling types have different top-dressing schedules—coniferous species should stop fertilizing 30 days before the end of the growing season, while broadleaf species should be fertilized before the onset of autumn.
Pest and disease control is crucial as seedlings grow. Pests and diseases can affect seedlings at any time, so prevention is key. Accurate prediction and monitoring of potential threats should be carried out regularly. Any emerging pests or diseases must be addressed promptly to minimize damage and protect the health of the seedlings.
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