How to judge the crop lack of fertilizer

As the saying goes: The crops (food, vegetables, fruits) need three treasures, and nitrogen, phosphorus and potash are indispensable. In the process of planting crops, farmers' friends can obtain a good harvest according to the different characteristics of crops and the actual demand for nitrogen, phosphorus and potash fertilizers in a timely manner. So, how to judge crops lack of fertilizer? 1. The main symptoms of nitrogen deficiency are: new branches are fine, short, small leaves, erect, leaf color gray-green, petiole, veins and cortex red; small flowers, fruit early and easy to fall off; Fine roots, large roots and few roots, new roots yellow, resistance to pests and diseases and drought resistance weakened. With soybeans as the main raw material, nitrogen fertilizers were lacking during the growth period. From the lower leaves, the leaf color became pale and pale green. Afterwards, it gradually became yellow and dry, sometimes with bronze-colored markings on the leaves. When severe, the plants stop growing and the leaves gradually fall off. 2. Phosphorus deprivation Phosphate fertilizers do not perform well in the early stages of crop growth. However, in the mid and late stages, phosphorus deficiency will affect nitrogen accumulation and protein synthesis. Phosphorus deficiency in different crops has different symptoms. Such as: 1 The performance of wheat lack of phosphorus is: seedling growth is slow, the roots are stunted, tillers are reduced, the base of the stem is purple, the leaves are dark green, slightly reddish, the spikes are small, and the grain weight is significantly reduced. 2 Phosphorus deficiency in maize: The seedlings grow slowly. The symptoms are more obvious at the 5 leaf stage. The leaves are purple, and the corn cobs are short and small, showing a curved shape. Baldness appears prematurely and most of the grains are not full. 3 Phosphorus deficiency in soybeans is manifested by darker leaves, dark green or dark green, small, pointed, narrow leaves, and upright erection. Plants are thin and grow slowly. In severe cases, the stems may appear red, and if the soybeans are deficient in phosphorus after flowering, brown spots appear on the leaves. 4 Phosphorus deficiency in fruit trees is characterized by poor fruit quality, slow growth, sparse foliage, and yellow-brown leaf color that are prone to early shedding. 3. Potassium deficiency in different crops has different symptoms. For example, the tips of the lower leaves of the general crops turn yellow and gradually yellow along the edges of the leaves. The veins on both sides and midribs are still green. In severe conditions, most of the leaves are yellow and the edges of the leaves are fiery. 2 Cereal crops show reduced tillering power, and the stems are soft and easy to fall down. 3 The dicotyledonous leaves curl, gradually shrink, and sometimes the leaves are incomplete, but the middle leaves remain green. 4 The quality of root crops is reduced and the quality is poor. 5 Fruit maturity is inconsistent, and flesh is increased in wood quality, sour taste is not delicious.

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