There are six bogey in applying fertilizer to vegetables

A hang leaf vegetable apply ammonium nitrate. Cabbage, Chinese cabbage, mustard, water spinach, celery, spinach, etc., the growth period is short, easy to absorb nitrate nitrogen fertilizer. For example, for ammonium nitrate used in tourism, green leafy vegetables absorb nitrate ions, and long-term consumption of salt will lead to intoxication and accumulation.

Second bogey urea after watering. The nitrogen component contained in urea is an amide. Under the action of urease secreted by soil microorganisms, the amide nitrogen is converted into ammonium carbonate or ammonium bicarbonate for absorption and utilization by vegetable roots, or for soil adsorption and preservation. If urea is applied immediately after it is watered or it encounters rain, amide nitrogen will be lost. Therefore, urea, whether used as base fertilizer or topdressing, should be applied for 5-7 days after it is applied, so that it can be transformed and then watered. In order to avoid loss.

Three avoid repeated application of ammonium sulfate. In acidic soils or in calcareous fields, continuous application of ammonium sulfate will make acidic soils more acid and cause calcareous soil compaction, which will prevent the normal growth of vegetables.

Four bogey vegetables in the absence of water application of ammonium bicarbonate. Ammonium bicarbonate is extremely unstable and volatile, especially in the case of drought and water shortage in vegetable fields. Therefore, in the application of ammonium bicarbonate in vegetable fields, regardless of whether it is basal fertilizer or top dressing, deep application should be carried out in the case of wet vegetable fields, and the soil should be covered immediately after application. In case of dry weather, water can be poured or watered after application.

5. Avoid excessive application of calcium. Vegetable fields such as a large number of consecutive application of phosphate fertilizer, excessive supply of phosphate fertilizer, especially in the case of more than 40 kilograms per mu application, will seriously affect the growth and development of vegetables, vegetables, premature aging of oranges, poor growth, yield, quality deterioration. Generally, Mushi 15-20 kg is better, fruits and vegetables can be given more appropriate.

Six to avoid the green leafy vegetable spray high concentration of nitrogen fertilizer. If urea, ammonium sulfate and Other solutions are sprayed on the leaves, the leaves of the vegetables can be used as fertilizers, the color is good, and the yield increases significantly. However, the content of nitrate on green leafy vegetables will also increase significantly, causing the food to be polluted and affect human health. .

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