In a greenhouse where cucumbers are cultivated, it's crucial to maintain the structural integrity of the building. The angle at which light enters the greenhouse is not something that should be altered arbitrarily. The north-south span, height, and back-slope angle of the greenhouse have been carefully designed through long-term scientific research. Any changes to these elements can negatively impact the growth conditions for the plants.
Another important consideration is the use of fertilizers. When applying multiple types of chemical fertilizers—especially those high in nitrogen—it's essential to avoid over-concentration. In humid and high-temperature environments, this can lead to the release of harmful gases. For example, if fertilizers are applied too densely in planting trenches, they can burn the cucumber roots and even cause them to die.
Grafting cucumbers is a common technique used to enhance disease resistance. However, it's important not to plant the seedlings too deep. If they are buried too far into the soil, the cucumbers may develop reproductive roots, which can reduce the effectiveness of the grafting process. This could ultimately defeat the purpose of the grafting itself.
On rainy days, many people avoid weeding, thinking that the shade and rain will lower the greenhouse temperature. While it’s true that temperatures might drop slightly, this practice can actually be more harmful. Without proper sunlight exposure, cucumbers may suffer from physiological stress, which can hinder their growth and development.
During winter, excessive use of nitrogen fertilizer should be avoided. As nitrogen dissolves, it can significantly lower the water temperature, which in turn affects the ground temperature. This can disrupt the normal growth of the cucumber Fruits and lead to poor yields.
When applying organic fertilizer, it's important to ensure it has been properly composted before use. If not, it may ferment quickly under high temperatures, releasing large amounts of ammonia. This can lead to the rapid breakdown of nitrogen in the greenhouse, potentially killing all the seedlings inside.
Spraying pesticides or nutrients at noon is generally not advisable. The high temperatures cause rapid evaporation of leaf moisture, preventing the plants from absorbing the solution effectively. This is especially true for certain formulations like manganese or zinc-based products, which can cause phytotoxicity. On the other hand, spraying in the evening can also be problematic, as the damp conditions may prevent full absorption, leading to ineffective treatment and possibly worsening disease issues.
Lastly, improper pruning practices, such as excessively shortening the vines, can lead to reduced leaf coverage. This can limit the amount of sunlight the plants receive, affecting their overall growth and the development of the fruit. Careful and thoughtful pruning is essential to maintain healthy and productive cucumber plants.
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