Observing the "Yen" color and judging crop failure

It is very important and necessary to improve the yield and quality of crops by correctly judging the symptoms of fertilizer deficiency in crops and applying fertilizers in a timely manner to supplement the fertilizers lacking in crops.

The main symptoms of nitrogen deficiency are fine, short, small leaves, upright, grayish green leaves, petiole, veins, and cortex red; small fruit, small fruit, early fruit and easy to fall off; fine roots, large roots, new roots, yellow Pest and drought resistance weakened. Taking soybean as an example, in the absence of nitrogen fertilizer during the growth period, from the lower leaves, the leaf color becomes lighter and pale green, and afterwards it gradually turns yellow and dries up, sometimes with bronze-colored markings on the foliage. When severe, the plants stop growing and the leaves gradually fall off.

The main symptoms of phosphorus deficiency 1. The performance of wheat lack of phosphorus: seedling growth is slow, 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. The performance of maize lack of phosphorus is: seedling growth is slow, the symptoms are more obvious at the 5 leaf stage, purple leaves, corn cobs short and small, curved, premature baldness, most of the grain is not full. 3. Phosphorus deficiency in soybeans: darker leaves, dark green or dark green, small, sharp and narrow leaves, erect upright, thin plants, and slow growth. 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, yellow-brown leaf color, and early fallout.

The main symptoms of potassium deficiency are that the tips of the lower leaves of the crops turn yellow and gradually yellow along the edges of the leaves, and 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. Cereal crops show reduced tillering power, and the stems are soft and easy to fall down. The dicotyledonous leaves curl, gradually shrink, and sometimes the leaves are incomplete, but the middle leaves remain green. Root crops have reduced quality and poor quality. The fruit ripening period is inconsistent, the pulp wood is increased, and the taste is not good.

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