Foliar spray of potassium nitrate

Reasons for foliar spraying of potassium nitrate

Potassium nitrate may be foliar sprayed in one or more of the following situations:

§ Prevent nutrient deficiencies before they occur at the beginning of crop performance. Spraying is required when the leaf analysis value is below the expected optimal level.

§ Correct nutritional deficiencies.

§ Increase resistance to pests and diseases.

§ Promote fruit development and/or balance of plant growth and development, especially for fruit trees with physiological disorders.

Timing of foliar application of potassium nitrate

Apply when potassium nitrate requirements are confirmed for the crop

Apply under conditions favorable for KNO3 foliar spraying

Foliar spraying of KNO3 is very beneficial to the crop in the presence of one or more of the following conditions:

§ When nutrient uptake through roots is limited, due to:

§ Root damage: disease and mechanical damage.

§ Unfavorable soil conditions:

§ Too wet (flooded and anaerobic environments), too cold, and too dry.

§ Insufficient or excess soil nutrients.

§ Nutrient fixation (fixation of potassium by clay soils).

§ Salinization (cation competition).

§ When root nutrient supply cannot meet peak nutrient demand.

§ when the local nutrient requirements of a crop may exceed the plant's ability to redistribute nutrients

§ When local nutrient requirements are high near large fruits and ears.

§ When flowering occurs earlier than leaf development, which limits the transport of nutrients through the xylem, nutrient transport is limited.

§ To restore leaf stress caused by night frost as soon as possible.

Recommendations and guidelines for foliar spraying

Add the potassium nitrate to half the water in the container, stirring until all the potassium nitrate is dissolved.

§ The maximum solubility of potassium nitrate in water must not be exceeded.

§ When potassium nitrate dissolves, the temperature of the solution decreases. Increase the solution temperature and shorten the dissolution time of potassium nitrate.

§ Apply early in the morning or late in the evening when the air humidity is high enough to extend the leaf moisture retention period and promote nutrient uptake by the leaves.

§ Perform in-tank mixing tests to test compatibility with insecticides.

§ Prepare different concentrations of potassium nitrate and test the concentration of potassium nitrate when leaf burning occurs.

§ When the pH of the spray solution in the tank is slightly acidic (pH4-5), nutrient uptake is enhanced. Therefore, acid potassium nitrate is recommended for foliar spraying.

§ Leaf burning may occur when the pH of the final solution is below 4.

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