Second, the characteristics of fertilizer. During the vegetative growth stage of peas, the growth amount is small, and the nutrient absorption is also small. After flowering and sitting on the pod, the growth amount increases rapidly, and the nutrient absorption amount also increases greatly. The absorption of nitrogen, phosphorus and potassium in the peas is nitrogen. The highest amount of potassium, followed by potassium, the least phosphorus. Although the root nodules of peas can fix nitrogen in soil and air, they still need to rely on soil nitrogen supply or nitrogen fertilizer supplementation. Nitrogen fertilizer should always consider the nitrogen supply status of the nodule. In the early stage of growth, if the nitrogen is applied too much, the nodule formation will be delayed, and the growth of the stems and leaves will be too lush to cause the flowers to fall into the pods. In the harvest period, the nitrogen supply is insufficient, then the harvest period Shortened and reduced production. Increasing the application of phosphorus and potassium fertilizer can promote the formation of pea nodules, prevent the growth of disease, and enhance disease resistance.
Third, fertilization technology
1. Base fertilizer: The main root of pea is developed early and rapidly. Before the seedling has been unearthed for 6 days after sowing, the main root is elongated by 6-8 cm. When the seedling has just been unearthed 10 days after sowing, there are more than 10 thick roots, just 20 days ago. When the two compound leaves are unfolded, the main root can be as long as about 16 cm. Therefore, the base fertilizer should pay special attention to early application. The spring sowing in the north should be applied to the base fertilizer during the autumn ploughing. The southern autumn sowing should also apply the base fertilizer when planting the soil before sowing to ensure the seedlings and the seedlings. Generally, organic fertilizer is applied at 3000-5000 kg per mu, 25-30 kg of superphosphate, 10 kg of urea, 15-20 kg of potassium chloride or 100 kg of ash.
2, top dressing: According to the growth of peas, the first top dressing can be carried out at the beginning of flowering, generally 5 kg of urea, 5 kg of potassium chloride or 15-20 kg of ternary compound fertilizer, combined with watering; the second top dressing can be After sitting on the pod, 7.5 kg of urea per acre, 7.5 kg of potassium chloride or 20-25 kg of ternary compound fertilizer, combined with watering.
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