First, the main symptoms of nitrogen deficiency: new branches are thin and short, leaves are small, erect, leaves are grayish green, petioles, veins and cortex become red; flowers are less fruit, fruits are early and easy to fall off; fine roots are more, large roots are less, new roots Yellow, resistant to pests and diseases and drought resistance. Taking soybean as an example, nitrogen deficiency fertilizer during the growth period starts from the lower leaves, and the leaf color becomes lighter and pale green. Later, it gradually turns yellow and dry, and sometimes the bronze spots appear on the leaves. In severe cases, the plants stop growing and the leaves gradually fall off.
Second, the main symptoms of phosphorus deficiency: 1. The performance of phosphorus deficiency in wheat: seedling growth is slow, root system is poorly developed, tiller is reduced, the base of the stem is purple, the leaf color is dark green, slightly purple, the ear small particles are small, and the 1000-grain weight is significantly reduced. 2. The performance of phosphorus deficiency in maize is: slow growth at seedling stage, obvious symptoms in the 5th leaf stage, purple purple leaves, short and small corn cobs, curved shape, premature baldness, most of the seeds are not full. 3. The performance of soybean deficiency of phosphorus is: the leaf color becomes darker, it is dark green or black green, the leaf shape is small, sharp and narrow, and it stands upright, the plant is small and the growth is slow. In severe cases, the stem may appear red, and if the soybean is deficient in phosphorus after flowering, the leaves will appear brown spots. 4. The performance of phosphorus deficiency in fruit trees is: poor fruit quality, slow growth, rare leaves, yellowish brown leaves, prone to early shedding.
Third, the main symptoms of potassium deficiency: the tip of the lower part of the general crop turns yellow, gradually yellowing along the edge of the leaf, the veins on both sides and the midrib are still green. In severe cases, most of the leaves are yellow and the edges of the leaves are burnt. Cereal crops show weaker tillering power, soft stems and easy lodging. The leaves of dicotyledons are curled, gradually shrinking, and sometimes the leaves are broken, but the middle part of the leaves remains green. The quality of the root crop is reduced and the quality is poor. The fruit ripening period is inconsistent, the pulp is increased in wood, and the taste is sour and not good.
Author: Changji
Source: Hubei Agricultural News
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