The experience of leaf dressing

At present, the foliar dressing has been widely applied in agricultural production, especially in the middle and late stages of crop growth, and has the advantages of low cost, quick effect, and obvious effect. In order to improve the effect of foliar dressing, based on years of production experience, the following six points should be mastered:

1. Determine the best spraying period. Different crops have different best fertilizer-fertilizing periods. Spraying is early, the seedlings are small, the leaf area is narrow, and the effect of sucking fertilizers is poor. After the spraying, the leaves are yellowed and aged, and the function of sucking fertilizers is reduced. Some crops may be sprayed later and cause greediness. Late maturity affects production and reduces commodity value.

2. Determine the appropriate amount and concentration. The grain-per-mu spray rate is 30-40 kg and the concentration is 1%-2%. The amount of sprayed shoots per mu is 45-55 kg, the concentration is 0.5%-1%, and the spraying frequency is 2-3 times. For crops with many leaves and hairs, some adhesives, such as washing powder, soap, etc., can be added during spraying to increase the adhesion of liquid fertilizer on the leaf surface and extend the suction time of the leaves.

3. Select the spraying weather and time. In different crops, the mesophyll cell structure is tight, the pore size and the development time are different. When the leaves are sucking fertilizer, they need certain temperature and humidity. Spraying weather should be selected on a cloudy or sunny day in the morning or after 4 pm to avoid high temperature light irradiation at noon, so as to avoid excessive evaporation of liquid fertilizer affect the effect of suction. The temperature during spraying fertilizer should reach 25°C-30°C, the liquid temperature of the liquid fertilizer should be between 20°C and 28°C. The water temperature and the low temperature can affect the effect of spray fertilizer. In the weather with excessive wind speed, the effect of foliar dressing is not satisfactory. In addition, rain should be sprayed within 2 hours after spray application.

4. The choice of spraying plots. First, there is a significant defertilizer plot at the end of the base fertilizer shortage, and secondly crops that are prone to or have already suffered from a deficiency syndrome, and thirdly, plots for high-yield, high-efficiency plots such as nurseries, flowers, greenhouses, etc. Corn, rape seed production and so on.

5. Season of foliar dressing. The suction strength of the leaves is closely related to the temperature. Generally, the high-temperature weather absorbs more fertilizer and the low-temperature weather absorbs less or even no fat. From the seasons, the foliar dressing is mainly from early spring to late autumn. From the stage of crop growth, it is mainly the period from vegetative growth to vegetative and reproductive growth.

6. Select the appropriate fertilizer type. Foliage dressing should be based on the needs of the crop to determine the type of fertilizer, symptomatic under the fertilizer, quick-impact supplement. Generally soluble in water-soluble chemical fertilizers (nitrogen, phosphorus, potassium, micro-fertilizer), biological bacteria and other fertilizers, with the use of. Fertilizers can be applied individually or in several combinations.

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