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(1) The blade wetting time is as long as possible. The longer the leaves are wetted after the root spray, the more nutrients the plants absorb. Therefore, it is generally preferred to spray at 4 o'clock in the afternoon or before 9 o'clock in the morning. It is not suitable for the midday sun to violently and the wind and rain. If it is cloudy, it can be done all day.
(2) The solution should adhere to the blade sufficiently. In order to do this, generally use a better performance sprayer; preferably mix a small amount of "wetting agent", such as neutral soap or seagull detergent (not suitable for strong acid and alkali), the concentration is generally 0.1-0.2% To promote the penetration of nutrients into the leaves.
(3) The concentration and pH of the nutrient solution should be appropriate. The greater the concentration of the solution in the allowable concentration range, the better the absorption of the leaves, and the reduction of the formulation of too much solution, too much concentration will burn the leaves and hinder absorption. The concentration of various crops can be tolerated. Generally, cereal crops can be thicker, and dicotyledonous crops such as beans and fruit trees can be thinner; young plants can be thicker. Generally, the concentration of the salt solution of a large amount of nutrients is approximately 0.2-2%, and the salt solution of the trace element is approximately 0.01-0.1% (or a pure nutrient concentration of 0.01%). Please refer to the chemical fertilizer section for specific methods.
The pH of nutrient solution is generally close to neutral, and over-acid and alkali are not conducive to the absorption of nutrients by crops. The solution is acid-alkali and is adjusted to near-neutral by dilute acid or dilute alkali. If the main nutrient in the solution is a cation, the solution can be adjusted to be slightly alkaline. If it is an anion (such as nitrate and phosphate), it can be adjusted to slightly acidic. Because it is beneficial to the absorption of these ions by crops.
Problems should be paid attention to when applying fertilizer outside the roots
To get good results from external fertilization, pay attention to the following items:
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