It is one of the key measures to seize the high yield of cucumber and obtain high efficiency. Therefore, the quality of grafted seedlings has a very important influence on the growth of cucumber. In order to improve the survival rate of cucumber grafted seedlings, the following measures should be emphasized in the management of seedbeds. ?
1. Control the cucumber seedlings after temperature and humidity should be transplanted into the seedbed immediately, and then a small arch shed should be fastened and sealed tightly so as to facilitate the heat preservation so that the grafted wounds can heal as soon as possible. Within 3 days after grafting, the arch sheds are within The temperature should be maintained at 25°C to 30°C during the day, 18°C ​​at night, relative humidity at 85% to 95%; gradually reduce the temperature and humidity after 3 days; the temperature should be controlled at 22°C to 25°C during the day and maintain at night 12 °C ~ 15 °C, relative humidity dropped to 70% ~ 80%. ?
2. Pay attention to shading After grafting, shade the shade in time to avoid direct sunlight on the seedlings and cause wilting of scions. Generally, 2 to 3 days after grafting, weeds can be uncovered on dry mornings and early evenings to receive astigmatism. When the sun shines around noon, it covers the shade. After that, it gradually shortens the shade time and increases the exposure time to adapt to the natural light. Generally, there is no need for shading after 6 days. ?
3. After proper ventilation and grafting for 3 days, small ventilation is started, and from small to large, ventilation is gradually increased. Ventilation time should be gradually extended with the increase of grafting days. 7 days after grafting, small arch sheds can be removed and transferred to normal management. At this time, 75% chlorothalonil 500 times should be sprayed once to prevent invasion of pathogens. In the future, attention should be paid to the observation of the seedlings, if there is a wilting phenomenon. Timely light spray. ?
4. In time, the buds of the rootstock of the pumpkin seedlings are easy to germinate and produce new lateral buds, compete with the scions for water and nutrients, and affect the normal growth and development of the scion. Therefore, we must constantly inspect and wipe out after discovery to reduce the consumption of nutrients and promote the normal growth of scion. 5. Gradually cut off the root grafting cucumber grafted seedlings, 10 to 12 days after grafting, when the cucumber leaves the first true leaves spread out, with a blade from the graft wound 0.5 cm below the net cucumber hypocotyl cut, and pull at any time Root cucumber. When the root is cut off, use a straw to shade it and avoid strong light.
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