Seven taboos for growing cucumbers in greenhouses, growers must keep them in mind

1. Do not arbitrarily change the light-receiving angle of the greenhouse. The angle of the solar greenhouse currently used for growing cucumbers has been scientifically verified over a long period. Do not arbitrarily change its north-south span, height, and rear slope angle.

2. Do not apply fertilizer in a concentrated manner when planting. Various chemical fertilizers, especially nitrogen fertilizers, will produce large amounts of harmful gases under humid and high-temperature conditions. If applied in a concentrated manner in the planting furrow, it can cause cucumber root burn and seedling death.

3. Do not plant too deep. Everyone knows that cucumber grafting is for disease resistance. If the grafted seedlings are planted too deep, the cucumber will produce regenerated roots, lose the grafting effect, and fail to achieve the purpose of grafting.

4. Do not fail to pull up the straw mats on cloudy, rainy, or snowy days. People often think that pulling up the straw mats on cloudy, rainy, or snowy days will lower the temperature inside the greenhouse, so they do not pull them up. In fact, this practice causes more harm. If the straw mats are not pulled up, the temperature will only slowly decrease, and because the cucumbers cannot see sunlight for a long time, it will also cause physiological disorders.

5. Do not apply large amounts of nitrogen fertilizer in winter. After nitrogen fertilizer meets water, during its dispersion process, it will cause the water temperature to drop significantly, promote a decrease in ground temperature, and affect the normal growth of cucumber vines. 6. Do not apply undecomposed organic fertilizer. Organic fertilizer will quickly ferment after encountering high temperatures. During the fermentation process, large amounts of ammonia gas will be produced. In mild cases, it decomposes the nitrogen fertilizer in the greenhouse; in severe cases, it can kill all cucumber seedlings in the greenhouse. 7. Do not spray pesticides at noon or in the evening. Spraying pesticides at noon when the greenhouse temperature is too high causes leaf moisture to transpire quickly. Before the pesticide is absorbed, it dries out. Especially for manganese-zinc pesticides, this can cause pesticide damage. Spraying pesticides in the evening is exactly the opposite of noon. Because after spraying, the pesticide is not completely absorbed by the cucumber leaves, it will decompose and become ineffective due to moisture, fail to achieve the treatment purpose, and instead worsen the occurrence of disease. Liu Shujun