1. Cte strong seedlings

The robust seedlings of watermelon are the basis of high yield. The robust seedlings are long and thick for cotyledons and true leaves. The color is thick green and lustrous. The hypocotyls are thick and the height is less than 5 cm. The leaves are large and the petiole is short and thick, and the roots are developed. More, white and more roots, more hair on the leaves and wax powder; flower organs differentiated and developed normally, no pests and diseases.

IBA+NA-NAA

Mainly promote the rooting of watermelon. Soaking seed concentration of 10~25 mg/L can promote early germination of watermelon, which promotes seedling robustness and increases yield and quality. Peking University application shows that rooting agent 10

The mg/L soaking seeds can be germinated 24 hours after treatment for 1 hour, while the germination is only 36 hours after treatment with water, and the seedlings grow fast after treatment, and the strong seedlings are cted.

Three days before transplanting of melon crops, 10~15 mg/l of indolebutyric acid + NAA-NA was used for rooting, germination and leaf spraying, which had good growth and strong seedling effect.

Paclobutrazol

In order to prevent pre-existing true leaves and hypocotyls during seedling growth, 50 to 100 mg/L of paclobutrazol can be sprayed on the cotyledons. Spread the vines to about 60cm, spray the whole plant with 200~500mg/L of paclobutrazol solution for growing over the plant, each time 10d, spray 2~3 times, can control the vine length and increase the sitting rate

However, paclobutrazol has a long residual effect in the soil and is unfavorable for the lower crops and should be used with caution.

Triacontanol

Soaking watermelon seeds with triacontanol emulsion 0.5 mg/L for 6 h can improve the germination rate and seedling quality, or spray it once more in 5 true leaves during the nursery process. The effect is better.

DA-6

Soaking seeds with 10 mg/L of DA-6 12 h and spraying once at the seedling stage can significantly reduce the occurrence of stagnation and anthracnose, and can significantly promote root growth and enhance absorption activities, and enhance cold resistance and drought resistance. Ability, leaves are thick green and shiny, shiny.

Alizarin

In the seedling stage, the alfalfa lactone emulsifiable concentrate was 0.01 mg/L, and the leaf surface was sprayed with the liquid 667m240kg, which was effective.

Sodium nitrophenolate

Soaking seeds with 6mg/L sodium nitrophenolate for 12h, spraying once at the seedling stage can promote rooting and germination, and Miaoqi Miaozhuang can reduce the occurrence of diseases.

2. Prevention and control of dead plants

During the seedling stage of watermelon or some time after planting, the seedlings sometimes appear to be delayed, that is, the phenomenon of dead seedlings appears. There are many reasons for causing deadlocks, such as insufficient supply of fertilizer and water, dry or early soil, poor air permeability and excessive application of chemical fertilizers. However, most of the northern greenhouses are due to the low temperature of the seedbed, the daily average temperature does not exceed 10 °C, and the ground temperature is lower than 15C for a long time. It cannot meet the growth needs of watermelon, especially the root growth is extremely unfavorable, resulting in weak absorption capacity. The seedlings are not stiff. All factors affecting root growth and absorption activities can cause dead seedlings. In addition to solving the ction measures, plant growth regulators can be used to promote their growth.

Gibberellin

Gibberellin Acid is a plant growth promoter. In the early maturity ction of watermelon, due to the adverse environment of temperature change and the adverse factors such as transplanting roots, it is easy to cause watermelon seedlings and the growth of the plant body is slow. If the GA3 solution is used at a concentration of 50~100 mg/L, the watermelon seedlings can be sprayed. After 3~5 days, the growth of the roots and stems of the melon seedlings can be obviously promoted, which is characterized by internode elongation and leaf growth. Large, the chlorophyll content per unit area decreases, and the leaves become shallow.

Gibberellin + foliar fertilizer

Containing 10 elements of nitrogen, phosphorus, potassium, boron, manganese, zinc, iron, copper, magnesium and sulfur, it promotes the growth of watermelon cells, leaf photosynthesis, and growth of young leaves, flower buds, roots and fruit development. . Spraying with 50mg/L foliar at the seedling stage can alleviate the chlorosis caused by gibberellin in the leaves, but the concentration of gibberellin should not be too high, so as to avoid causing long and weak seedlings.

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