Technical specifications for melon seedling plug trays
Melon belongs to the Cucurbitaceae family and is a heat-tolerant and heat-resistant crop. The temperature range for seed germination is 24 ℃ ~ 35 ℃, the optimal temperature is 28 ℃ ~ 32 ℃, the growth suitable temperature is 25 ℃ ~ 30 ℃ during the day, 15 ℃ ~ 20 ℃ at night, and growth is less than 15 ℃. When the light is sufficient, the plant is robust, the light compensation point is 4000Lx, and the light saturation point is 55000Lx. Melons like to be loose, highly permeable, pH value 6.0 ~ 6.8, neutral and acidic matrix.
The melon leaf area is smaller than that of cucumber. It is more appropriate to use a 128 holes seedling tray, peat / vermiculite 2: 1, or peat / vermiculite / waste mushroom material 1: 1: 1. Add 15: 15: 15 NPK fertilizer ternary compound fertilizer per kilometer when preparing the matrix 2 kg ～ 2. 4 kg, or 1 kg of urea and 1 kg of potassium dihydrogen phosphate per cubic meter of substrate. Mix the fertilizer with the substrate evenly before use.
Most of the cultivars are Elizabeth, Siboluotuo, No. 1 champion, Jingyu No. 1 and Honey World. The suitable sowing period is pushed forward according to the planting period for 30 to 35 days, soaking seeds to promote budding, sowing, etc. refer to watermelon seedling container.
From the time of sowing to the stage of Qimiao, the focus is on temperature management. It is appropriate to use 28 ℃ ～ 30 ℃ during the day and 18 ℃ ～ 20 ℃ at night. During this period, the temperature is too high, which may cause the seedlings to grow too long. When the temperature is too low, the cotyledons will sag, rot, or suddenly fall. Special attention should be paid to avoid high temperature and low temperature differences during the day and night. After the seedlings are cooled, the temperature is about 25 ℃ during the day and about 16 ℃ at night.
At the seedling starter stage, when the cotyledons are expanded inside seed starting tray with 2 leaves and 1 heart, the moisture content is 65% to 70% of the maximum water holding capacity. After 2 leaves and 1 heart, spray water with fertilizer once and twice; 2 leaves and 1 heart to the commercial seedlings. Sales, moisture content is about 60%, training before planting, night temperature can be reduced to 12 ℃.
