There are "seven taboos" for growing cucumbers in greenhouses
Avoid arbitrarily changing the light receiving angle of the greenhouse. The light receiving angle of the solar greenhouse where cucumbers are grown in various places has been scientifically demonstrated. Its north-south span, height and back slope angle should not be changed at will.
Avoid concentrated fertilization when planting.*** Chemical fertilizers, especially nitrogen fertilizers, will produce a lot of harmful gases when they are humid and high temperature. If concentrated in the planting ditch, they can cause cucumbers to burn roots and die.
Avoid planting too deep cucumber grafting for disease resistance. If the planting grafted seedlings are too deep, the cucumber will give birth to regenerated roots and lose the grafting effect and fail to achieve the purpose of grafting.
Avoid rainy and snowy days without grass thatch. People often think that grass thatch is pulled on cloudy, rainy and snowy days, and the temperature in the greenhouse will drop, so no grass thatch is pulled. In fact, this practice will be more harmful. The temperature of the grass thatch will only slowly drop, and it will also cause physiological disorders due to the long-term lack of sunlight in cucumbers.
Avoid applying a large amount of nitrogen fertilizer in winter because nitrogen fertilizer will drop significantly in the process of dispersion after encountering water, resulting in lower ground temperature and affecting the normal growth of cucumber seedlings.
Avoid applying unripe organic fertilizers. Organic fertilizers will ferment quickly when exposed to high temperatures. A large amount of ammonia will be produced during the fermentation process. The weaker ones will decompose nitrogen fertilizer in the greenhouse, and the more serious ones can kill all cucumber seedlings in the greenhouse.
Avoid spraying at noon and evening. The temperature in the greenhouse is too high for spraying at noon, and the leaves will evaporate quickly, and they will be dried before the medicine is absorbed. Especially the manganese-zinc medicines are likely to cause phytotoxicity. Spraying in the evening is just the opposite of noon. Because the cucumber leaves are not completely absorbed after spraying, it will decompose and fail due to moisture, which will not achieve the goal of ***, but will aggravate the disease.
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