A common mistake is randomly adjusting the light exposure angle of the greenhouse. The design of the greenhouse, including its north-south span, height, and rear slope angle, is based on long-term scientific research. These factors should not be altered arbitrarily, as they directly affect the growth conditions for cucumbers.
Another error is over-fertilizing during planting. Using excessive chemical fertilizers, especially nitrogen-based ones, can lead to harmful gas emissions under hot and humid conditions. When concentrated in planting furrows, these fertilizers may burn the roots of cucumber plants, leading to plant death.
A third mistake is planting too deep. Many farmers now use grafted seedlings to resist diseases. However, if the grafting point is buried too deeply, the cucumber plant may develop new roots from the graft site, which can reduce or eliminate the benefits of grafting and fail to prevent diseases effectively.
Some people avoid ventilating the greenhouse on rainy days, thinking that the temperature will drop and there's no need to open it. In reality, prolonged lack of sunlight can cause physiological stress in the plants, leading to poor growth and even death in severe cases.
It's also a mistake to apply nitrogen fertilizer during winter. Nitrogen decomposition can significantly lower water temperature, which in turn reduces soil temperature and hinders the normal development of cucumber fruits.
Using unripe organic fertilizer is another common mistake. When exposed to high temperatures, uncomposted organic matter can ferment quickly, releasing large amounts of ammonia. This can damage the plants, especially when combined with nitrogen fertilizers, potentially killing all the seedlings in the greenhouse.
Spraying pesticides at noon or in the evening is not recommended. During midday, high temperatures cause rapid evaporation of water from the leaves, reducing the effectiveness of the spray and increasing the risk of phytotoxicity, especially with manganese and zinc-based products. Spraying in the evening leads to similar issues, as the moisture prevents proper absorption, causing the chemicals to break down and fail to control the pests, worsening disease problems.
Planting too low is another issue. If the vines are allowed to fall and become too short, the leaves may not receive enough light, affecting fruit development and overall yield.
Growing cucumbers and tomatoes together in the same greenhouse is also problematic. Both crops release root exudates that can inhibit each other’s growth. This mutual inhibition reduces yields, lowers quality, and decreases profitability. Additionally, both crops are vulnerable to pests like aphids, and if one becomes infested, it can easily spread to the other.
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