Foliar fertilization has the advantages of small dosage, strong pertinence, rapid absorption, obvious effects and low cost, and is particularly effective for less rooted crops. The author now summarizes ten key points for crop fertilization that are summarised in practical applications:
Spraying should be targeted. That is, depending on the nutrient required by the plant at each growth stage, the corresponding fertilizer is selected and targeted supply is provided. For example, if the sprouts need to be dominated by nitrogenous fertilizers, potassium fertilizers must be used at the same time. When the new seedlings mature, potassium fertilizers should be added to ensure that the plants thrive and grow;
Fertilizer varieties should be suitable. The commonly used leaf fertilizers in production include urea, potassium dihydrogen sulfate, and potassium sulfate. These fertilizers have the characteristics of stable performance and no damage to the blades. According to another study, the amount of fertilizer penetrating on the leaf surface directly affects the effect of foliar dressing. At present, it is recognized that urea is the best choice for foliar dressing at home and abroad.
Mixed use of leaf fertilizer is appropriate. Although the total amount of fertilizers and fertilizers for commercial products is relatively complete, do not always use the same variety. Mix and use them alternately to make up for each other and make nutrition more comprehensive. When the foliage is topdressing, a reasonable mix of two or more types of foliar fertilizers will have a more significant effect on yield increase and save time and labor.
Spray concentration should be appropriate. The foliar dressing must be well controlled spraying concentration, the use of concentrations in strict accordance with the relevant instructions, is strictly prohibited arbitrarily increase the concentration, otherwise it will be counterproductive, resulting in damage, resulting in unnecessary losses. Especially for trace element fertilizers, the critical range between the shortage and excess of crops is very narrow, and it must be strictly controlled.
Spray time should be appropriate. Foliage top dressing is best carried out in the windless weather in the evening. Spraying fertilizer in the morning with dew will reduce the solution concentration and affect the effect of fertilization. Before the rain or the rain, no foliar dressing can be carried out because the nutrients are easily lost by the rain and do not achieve the desired effect.
Spray method should pay attention. Because the fertilizer is absorbed into the body through the stomata of the leaves, the stomata of the leaves are mainly on the back of the leaves, so the spray is mainly applied to the leaves and the back, and the nozzles must face upwards, and the fog points should be fine. At the same time, the spray volume should not be too large, and it is better to make the leaves not drip, so as to prevent the fertilizer liquid from accumulating the tip of the leaves to produce a burning tip.
The spraying frequency should be reasonable. The concentration of top-dressing crops on the foliage is generally relatively low, and the amount of each time of absorption is very small. Therefore, the number of top-dressing on the foliage should generally not be less than 2 to 3 times.
Spray evenly and carefully. The foliar dressing requires small droplets and uniform spraying, with particular attention to spraying the vigorously growing upper leaves and the back of the leaves. Because the new leaves absorb the nutrients faster than the old leaves and the back of the leaves, the absorption capacity is strong.
Fertilizer to add moisturizer. There is a layer of thick and thin cuticles on the leaves of the crop, and solution penetration is difficult. For this purpose, appropriate amount of pesticide synergist or wetting agent (such as neutral soap, better quality detergent) can be added to the leaf fertilizer solution to reduce the surface tension of the solution, increase the adhesive performance of the medicament, and increase the foliar dressing. Effect.
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