Watermelon is a high-grade fruit with high nutritional value, the following is the open-air watermelon planting techniques that I have carefully organized for you, take a look.

Open-air watermelon planting techniques

First, the law of fertilizer

Watermelon growing period is longer, the need for fertilizer is larger. According to the test, every 1000 kilograms of watermelon fruit production, nitrogen 2.5-3.2 kilograms, phosphorus 0.8-1.2 kilograms, potassium 2.9-3.6 kilograms, the ratio of the three elements of about 3:1:3.5-4 .

Watermelon life through the germination period, seedling period, stretching period, flowering and melon period. Different periods of nutrient demand is different. Generally, the absorption of nitrogen, phosphorus and potassium during the seedling period accounts for only 0.6% of the total absorption; the extension period accounts for 14.6% of the total absorption; the melon period accounts for about 84.8%.

Second, fertilization technology

melon field fertilization to do "enough, fine, clever", that is, the base fertilizer to be enough, fertilizer to be clever.

a, base fertilizer: base fertilizer is the foundation of the yield, but also an important measure of disease prevention, yield and disease resistance has a great impact, be sure to apply enough base fertilizer. General acres of well-rotted high-quality organic fertilizer 3000-4000 kg, 100 kg of cake fertilizer, urea 15-20 kg, calcium superphosphate 35-50 kg, 25-30 kg of potassium sulfate, or three-element composite fertilizer 50-60 kg, combined with deep tilling into the ground. The specific amount of fertilizer can be based on local soil fertility and yield levels.

b, fertilizer: timely fertilizer is a key measure to improve watermelon yield, quality and promote the size of watermelon head.

Seedling in the premise of adequate base fertilizer, generally do not need fertilizer. Indeed need fertilizer, per mu can be applied to high nitrogen compound fertilizer 5-10 kg or 4-5 kg of urea, fertilizer time should be mastered in the seedling to grow 2 true leaves. Seedlings should not fertilize too much, too close to the root, to prevent injury to the root burn seedlings.

c, stretching period, watermelon fertilizer and water needs gradually increased, according to the growth trend of fertilizer, generally in the melon vines to 40-50 cm, combined with watering per mu of urea 15-20 kg, potassium sulfate 10-15 kg or high-nitrogen composite fertilizer 20-25 kg, in order to promote the growth of the melon vines. Sufficient base fertilizer and applied to lift the seedling fertilizer less nitrogen fertilizer.

d, melon period, in the young melon growth to the size of an egg and faded velvet, per mu of compound fertilizer (combined with watering) 25-30 kg, hole or strip, mulching after application.

Watermelon fertility cycle

The whole life cycle can be divided into four periods: germination, seedling, vine and fruit.

(1) Germination. From the seed sprouting to the cotyledon unfolding, the true leaves are revealed as the germination period. After the seedlings emerge from the soil, it is necessary to prevent futile growth in order to promote the development of roots and leaves.

(2) seedling period. From the true leaves revealed to 5 a 6 leaves for the seedling period. This period of growth is small, cultivation should be given good conditions to promote the seedling root system and organ differentiation.

(3) Vines. From 5-6 leaves to the beginning of the vines to stay melon nodes of the female flowers open for the vines. This period of growth is fast and large. Cultivation should promote the growth of stems and leaves, the formation of a certain nutrient body. System, at the same time to control the growth, to ensure the formation of the flower organ.

(4) fruiting period. From the opening of the female flowers of the retention nodes to the fruit began to grow vigorously. It can be divided into three periods: the fruiting period, the period of vigorous fruit growth, and the period of fleshing.

(5) fruiting period. By leaving the female flowers of the melon section open to the fruit began to grow vigorously. Photosynthetic products began to fruit input. Cultivation is mainly to regulate the balance of nutrient growth and fruit development to ensure the sitting of the melon.

(6) fruit vigorous growth period. From the rapid growth of the fruit to the fruit size is basically fixed. This period of fruit growth, absorb the most nutrients, is the formation of the key period of yield. Cultivation should be given to large fertilizer, water, promote the rapid growth of fruit.

(7) change flesh period. From the fruit size is basically fixed to the ripening period. This period of rapid transformation of sugar, the appearance of the inherent color of the variety. Cultivation should prevent early stem and leaf failure to ensure yield and quality.

Open field watermelon planting fertilizer law

Watermelon growing period is longer, more fertilizer. According to the test, every 1000 kilograms of watermelon fruit production, nitrogen 2.5-3.2 kilograms, phosphorus 0.8-1.2 kilograms, potassium 2.9-3.6 kilograms, the ratio of the three elements of the about 3:1:3.5-4 .