In order for watermelons to grow big and sweet, fertilization is key. Here are the fertilization recommendations for watermelon planting:
Base fertilizer: Before planting, sufficient base fertilizer should be applied to provide nutrients for the whole growth period of watermelon. The base fertilizer should be based on organic fertilizer, such as well-rotted farmhouse fertilizer, manure, etc., and the application rate per mu is generally 3000 5000 kg. In addition, an appropriate amount of chemical fertilizers, such as compound fertilizer, urea, etc., can also be added to provide nutrients such as nitrogen, phosphorus, and potassium.
Seedling fertilizer: At the seedling stage of watermelon, seedling fertilizer should be applied to promote the growth of seedlings. Seedling fertilizer is generally mainly nitrogen fertilizer, and 5 10 kg of urea or 10 15 kg of ammonium sulfate can be applied per mu. The application time of seedling fertilizer is generally 7 to 10 days after planting, combined with watering.
Vine extension fertilizer: During the watermelon vine extension period, vine extension fertilizer should be applied to promote the growth of vine leaves and expand the leaf area. The application time of vine extension fertilizer is generally about 30 cm when the vine is about 30 cm long, and 20 30 kg of compound fertilizer can be applied per mu.
Expanded melon fertilizer: In the watermelon expansion stage, expanded melon fertilizer should be applied to meet the needs of watermelon fruit expansion. The application time of bulging melon fertilizer is generally when the fruit is the size of the egg, and the water-soluble fertilizer can be applied to the fruit, and at the same time an appropriate amount of potassium fertilizer is added, and a large number of elements are 10 15 kg. The application of gourd fertilizer should be carried out in stages, and generally can be applied 2 or 3 times.
In addition to the above four fertilizations, attention should also be paid to foliar sprays. During the growth period of watermelon, foliar fertilizer can be sprayed every 7 to 10 days, such as Fuyou leaves, Fuyou flowers, etc., to provide sufficient nutrients and promote the growth and development of watermelon.
During fertilization, the following points should also be noted:
The amount of fertilizer should be applied in an appropriate amount to avoid excessive or insufficient fertilization. Excessive fertilization can easily cause excess nutrients, resulting in excessive growth and quality decline of watermelon. Insufficient fertilization will affect the normal growth and development of watermelon.
Fertilization should be even, and fertilizer should not be concentrated in a certain part, so as not to cause root burning or leaf burning.
The fertilization time should be appropriate, and avoid fertilizing in drought or high temperatures to avoid causing harm to the watermelon.
In short, reasonable fertilization is a very important part of watermelon cultivation. Through scientific fertilization, watermelon can be provided with sufficient nutrients to promote its growth and development, so as to obtain watermelon with high yield and good quality.