Open-field cucumber cultivation is a relatively traditional cultivation mode. Before facility cultivation appeared, it was basically open-air cultivation, almost everywhere in the country. Compared with facility cultivation, open-air cultivation has natural disadvantages. Special attention should be paid to the following points.
1. Avoid the appearance of chemical melon in the early stage of cucumber growth. If the plant's nutrient supply is insufficient, it will lead to poor root system development, resulting in weak plant growth, and insufficient nutrient supply of female flowers will easily lead to chemical melon. In addition, if there is too much water and fertilizer, the soil moisture content will be too large, especially if the supply of nitrogen fertilizer is too much, the plants are prone to lengthen, and most of the nutrients are used for the growth of branches and leaves, resulting in poor fruit development and increased melon phenomenon. According to this characteristic, it is necessary to strengthen the fertilizer and water management in the early stage to promote the rooting of the plants and enhance the absorption capacity. In the middle and late stages of cucumber, top dressing should be determined according to the specific growth of the plant to promote the combination of control and control. In the fruiting period of cucumbers, it can be considered to use potassium dihydrogen phosphate solution for extra-root topdressing, which is helpful to prevent the emergence of melons.
2. Avoid flower topping. When the cucumber seedlings are planted, if the organic fertilizer is applied too much, the soil solution concentration is too high, which will easily cause the root water to leak out, and eventually form a burning root-type flower topping, and the roots and leaves will turn yellow. The leaves shrink and the seedlings basically stop growing. In this case, it is necessary to water in time to ensure that the soil is sufficiently moist. After watering, it will be cultivated in time, and normal growth will resume within 1 to 2 days. The plants can also be sprayed with brassinolide, triacontanol and other plant growth regulators that promote the rapid growth of stems and leaves.
3. Avoid excessive growth of the plant during the cucumber growth period. If too much nitrogen is used, especially if the fertilizer is applied too early, it will cause the plant to grow excessively. In order to avoid excessive plant growth, it is recommended to use formula fertilization, balanced fertilization, appropriate increase in organic fertilizer, and pay attention to the combined application of nitrogen, phosphorus, and potassium fertilizers. Reasonable watering and temperature control are also necessary.
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