During the period of vegetable nursery, if the seedbed soil is not fertile enough and the seedlings appear to have de-fertilizer symptoms (such as fine stems, small leaves, and light shades), they should be top-dressed in time. Specific requirements and practices are:

1. The topdressing time is generally equal to the seedlings and the cotyledon flattening. In the daytime, it is better to use a sunny day at 10 to 12 o'clock.

2. Topdressing methods Fertilizers and organic fertilizers can be used as top dressings; topdressing with chemical fertilizers should be dominated by nitrogen fertilizers, and better with compound fertilizers. It can be watered first after application, or it can be applied with water or dissolved in fertilizer. The proportion of chemical fertilizers and watering applied in the water is controlled at 0.1-0.3:100; if the amount of chemical fertilizers used is too large and the concentration exceeds 0.5%, it is easy to see “burning seedlings”; follow-up organic fertilizers, use more cooked ones. For human waste or urine fertilizer, first dilute the fertilizer 10 to 20 times with water, then inject it into the seedbed; regardless of topdressing chemical fertilizer or organic fertilizer, spray water again after fertilization to wash off the fertilizer attached to the leaves to prevent Burn leaves, and timely ventilation, to prevent harmful gases (such as ammonia, hydrogen sulfide gas, nitrite gas, etc.) escaped harm vegetable seedlings.

3. For the dressing fertilizer outside the roots, when the seedbed temperature is low and the sucking ability of the seedling roots is weak, it is not suitable to perform the top dressing, and 0.1% potassium dihydrogen phosphate or 0.3% urea solution, or 0.2~0.3% of the superphosphate soaking leaf spray may be used. Shi.

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