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When the grafted seedlings are completely alive, the shade can be removed. However, in order to prevent the melon seedlings from wilting within a few days after the root of the grafted seedlings is cut off, the appropriate lighting time every day is based on the standard that the scion seedlings do not wilt obviously.
Insertion process: the rootstock seedling stem jack is used to remove the rootstock seedling together with the bowl from the seedling bed, and the blade is used to cross cut the second to third leaves of the seedling stem, remove the new leaves and growth points, and only one true leaf is left on the root seedling, and the redundant leaves are removed. Then, because the size of vegetable seedlings in the same seedbed is often uneven, and the thickness of seedling stems is also different, several bamboo sticks with different plug thickness should be prepared at the same time for replacement.
The second stage is about 15 days from the survival of grafted seedlings to the end of one week before the planting. From the fourth day of the day, it is required to gradually extend the ventilation time of the seedling bed and gradually increase the air volume. After the grafted seedlings survive, remove the small arch shed. When the melon seedlings wilt around noon on a sunny day, they can only be shaded with straw to cool down. The second stage is the period of cultivating strong seedlings. This stage starts from the survival of grafted seedlings to the end of the planting of grafted seedlings.
In the first stage, it takes about 8-10 days from the time when the grafted seedlings are put into the seedling bed to the end of the survival of the grafted seedlings. The suitable temperature for this stage is 25 ~ 30 ℃ in the daytime and about 20 ℃ at night. At this stage, the temperature requirements are not very strict, and the temperature range can be relaxed. The suitable temperature is 20 ~ 32 ℃ in the daytime, and about 25 ℃ is the most suitable temperature; 12 ~ 18 ℃ at night, and 15 ℃ is the best. The third stage is about one week before the planting of melon seedlings.
The temperature is kept at about 20 ℃ during the day and 8 ~ 10 ℃ at night, and the minimum temperature can be reduced to about 6 ℃. Air humidity management air humidity management is conducted in two stages. Hold the blade with your right hand, close to the cotyledon on the narrow side of the seedling stem (the entrance of the blade is required to be no more than 0.5cm away from the ion leaf), and cut a 0.8-1cm long cut forward at an angle of 30 ° - 40 with the seedling stem. The depth of the cut is about 2 / 3 of the diameter of the seedling stem.
The requirements for air humidity in this period are relatively strict, and the management is as follows: after grafting, the grafted seedlings shall be placed in the seedling bed immediately, and covered with a small arch shed to keep the air humidity in the seedling bed above 90%. When the air humidity is insufficient, water shall be sprayed on the ground in the border, but water or water shall not be sprayed on the melon seedlings, so as to prevent the sewage from flowing into the interface and causing the interface to be infected and rotten. The seedlings that have withered or died of disease shall be removed from the seedbed.
