When is the best time to apply top dressing to peanuts?

Peanut is a common crop in China. It can not only be pressed for oil, but also made into various pastries and foods. At present, it is planted in most areas. If you want to grow peanuts well, you need to apply fertilizer well. So when is the best time to apply top dressing to peanuts?

1. When is the best time to apply top dressing to peanuts?

1. Seedling stage: At the 3-5 leaf stage, apply quick-acting nitrogen fertilizer and No. 3 Flower Promoting King to promote flower bud differentiation and more flowering, which has a good effect on promoting early and vigorous branching and increasing the number of flowers and pods.

2. Flowering and pod-setting stage: After the beginning of flowering, nutrient uptake increases sharply, but rhizobia also begin to continuously supply nitrogen nutrition to peanuts. If nitrogen fertilizer is applied in excess as top dressing, it is easy to cause excessive vegetative growth of stems and leaves in the later stage and lodging of seedlings. Therefore, after flowering, nitrogen fertilizer is generally not applied as top dressing. Instead, the main measure is to seize the beginning of the peanut flowering stage, combined with the last intertillage and weeding, and apply compound fertilizer and calcium fertilizer. Also spray Diguo Zhuangdiling to make the nutrient transport vessels of underground fruits thicker, improve the swelling vitality of underground fruits, make the fruit shape robust, and achieve high quality and high yield.

3. Pod-filling stage: During this period, the demand for phosphorus increases. The method of foliar phosphorus spraying can be adopted, using 0.3% potassium dihydrogen phosphate plus Xin Gao Zhi Mo for spraying, to improve the utilization rate of effective components of chemical fertilizer. Spray once every 7-10 days, for 2-3 consecutive sprays.

2. How to apply top dressing to peanuts?

1. Seedling-stage top dressing: When soil fertility is low, the amount of base fertilizer is insufficient, and seedlings grow poorly, seedling fertilizer should be applied early as top dressing to promote early seedling growth. Seedling-stage top dressing should be applied before the beginning of flowering, mainly nitrogen fertilizer, with phosphorus and potassium fertilizers combined. Generally, apply 8 to 10 jin of nitrogen fertilizer per mu, or 30 to 40 jin of compound fertilizer, by broadcasting or trenching in rows.

2. Flowering and pegging stage: After the beginning of peanut flowering, when top dressing is applied, the plants grow vigorously, a large number of effective flowers open, and a large number of pegs enter the soil one after another, so the demand for nutrients increases sharply. If base fertilizer and seedling fertilizer are insufficient, top dressing should be applied in time according to the growth status and appearance of peanuts. However, at this time, peanut rhizobia have a strong nitrogen-fixing capacity, and the amount of nitrogen fixed can basically meet their own needs, while the demand for phosphorus, calcium, and potassium fertilizers is urgent. Therefore, the amount of nitrogen fertilizer should not be too much, and top dressing should mainly be phosphorus, potassium, and calcium fertilizers to avoid excessive vegetative growth. Generally, apply 40 jin of calcium superphosphate per mu and 500 jin of high-quality organic fertilizer per mu to improve phosphorus and calcium nutrition for peanuts.

3. Foliar spraying: Foliar spraying on peanuts (also called foliar top dressing) has the effects of high absorption and utilization rate, fertilizer saving, and significant yield increase. Especially in the later stage of peanut growth and development, when the root system ages, the effect of foliar spraying is more obvious. When nitrogen fertilizer is sprayed on the leaves, the absorption and utilization rate by peanuts reaches more than 50%; when phosphorus fertilizer is sprayed on the leaves, it can quickly be transported to the pods, promoting pod filling and plumpness. In the later stage of peanut growth, use 200 grams of potassium dihydrogen phosphate per mu, mix with 120 jin of water, and spray on the leaves. It is best to spray 3 consecutive times, once every 7 days.