In addition to nutrients in the roots of plants, leaves and green shoots can also absorb nutrients. Spraying the nutrient-containing solution onto the aerial parts of the crop (mainly the leaves) is called extra-root fertilization.
The advantages of extra-root fertilization are:
(1) Directly supply crops with effective nutrients to prevent them from being fixed or transformed in the soil and reduce fertilizer efficiency.
(2) When the absorption force to be lined is weak, the roots are fertilized and the crop is easily absorbed into nutrients. For example, the spraying of urea and potassium dihydrogen phosphate in the later stage of rice growth will have a good effect.
(3) The absorption and transformation of nutrients by leaves are faster than roots, and they can timely supplement the needs of crops for nutrients. For example, it usually takes 4-5 days for urea to be applied to soil, but it usually works after 1-2 days. Therefore, the use of external root fertilization is effective in preventing deficiency diseases.
(4) Root-fertilization is suitable for mechanization and is economical and effective. The amount of fertilized roots is usually only about 10% of the soil. Many fertilizers, especially urea, can be sprayed together with many pesticides. Save time and labor; such as the use of mechanical spray high efficiency and quick. The use of extra-root fertilization in the cultivation of fruit trees, tea plants and vegetables is most suitable. Nowadays, mechanical fertilization in pineapple is widely used abroad.
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