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 include: fine, short branches, small leaves, erect leaves, gray-green leaves, red, petiole, veins, and cortex; small fruit, early fruits, easy to fall off; fine roots, large roots, few roots, new roots Yellowing, resistance to pests and diseases and drought resistance weakened. With soybeans as the main raw material, nitrogen fertilizers are lacking during the growth period. From the lower leaves, the leaf color becomes lighter and greenish. After that, it gradually turns yellow and dries up, sometimes with bronze-colored markings on the leaves. When severe, the plants stop growing and the leaves gradually fall off.
2. In the early stage of crop growth, the role of phosphate fertilizer is not very obvious, but in the middle and late periods, phosphorus deficiency will affect the effective accumulation of nitrogen and protein synthesis. Phosphorus deficiency in different crops has different symptoms. Such as: 1, the performance of wheat deficiency is: seedling growth is slow, poor root development, tiller reduction, the base of the stem is purple, dark green leaves, slightly reddish, small spikes, grain weight decreased significantly. 2. Phosphorus deficiency in maize is manifested by slow growth during the seedling stage, obvious symptoms at the 5 leaf stage, purplish red leaves, short and small corn cobs, curved shape, premature baldness, and lack of full kernels. 3, the performance of soybean phosphorus deficiency is: darker leaves, showing dark green or black and green, leaf-shaped small, sharp, narrow, and upright erection, plant thin, 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, and yellow-brown leaf color, which are prone to early shedding.
3, different crops lack of potassium, its performance symptoms are different. 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 leaves of dicotyledonous plants curl, gradually shrink, and sometimes the leaves are incomplete, but the middle leaves remain green. 4. The quality of root crops is reduced and their quality is poor. 5, fruit maturity is inconsistent, fruit wood increased, taste sour and not delicious.
Author: Meng Yong