Spotting watermelon in greenhouse
Ma Xinshi, president of the National Agricultural Labor Model and Shaanxi Provincial Association of Professional Farmers, believes that the following points should be noted in the greenhouse planting of watermelon:
The planting time in mid-March is the key period for early-spring greenhouse watermelon colonization. In the 3-4 true leaves of watermelon seedlings, the average daily temperature is stable at 14 °C, and the greenhouse temperature is fixed at 25-30 °C.
Planting preparation for refining: 5-7 days before planting, the small arch shed on the seedbed is removed, the ventilation time during the day is extended, the temperature of the seedbed is gradually reduced, and watering is continued 2-3 days before planting.
Preparation: Enhance the resistance and rooting ability of melon seedlings, prepare for early seedlings; choose the same size of melon seedlings; and water the plants a few days before planting, so that the soil is loose when planting, not sticky, then Cover the mulch.
Density of planting points: Planting density varies with soil fertility and different varieties. The density is too large, the sugar content of watermelon is reduced, and the shade is shaded, causing poor ventilation and affecting photosynthesis. If it is too small, it will cause total yield. It is reduced, so the average fruit type is 500 plants per acre.
Method: When planting, drill the hole on the ridge surface according to the plant spacing of 50 cm. The hole diameter is the same as the hole size of the hole. Then put the seedling into the planting hole, cover the soil and cover it. Be careful not to plant it too deep, otherwise it will affect the hair. Roots, easy to stale seedlings, slow seedlings slow.
Management of root water after planting: After the planting is completed, it is necessary to pour a set of root water to allow the root system to be tightly combined with the soil to facilitate rooting of the seedlings.
Insulation: During the early spring planting, the temperature at night is still very low, so it is necessary to cover a small arch shed on the ridge to keep the night temperature not lower than 15 °C.
Precautions (1) Planting should be carried out on sunny days, and it is necessary to ensure clear weather for more than 2 days after planting, which is beneficial to plant slow seedlings; in case of continuous rainy weather, it is necessary to extend the planting time appropriately; (2) Too wet, soil moisture content is controlled at 65%-70%, it is easy to cause roots when it is too wet; (3) When the temperature inside the shed is too high, it is necessary to properly open the shed to prevent burns, and the temperature remains at 25-28. °C is suitable; (4) Multi-membrane cover should be set in the greenhouse to promote slow seedlings, and at the same time ensure that even if there is a large temperature change in the outside, there will be no low temperature physiological obstacles; (5) When planting, it is necessary to eliminate weak seedlings and injured seedlings. The diseased seedlings are selected and planted in a stable and disease-free seedling, which is conducive to the robust growth of the plants after planting, and the growth is neat and convenient for unified management.
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