Early winter fertilization techniques for greenhouse vegetables
Add organic fertilizer. Organic fertilizer can improve the water retention and fertility of the soil, and can adjust the pH of the balanced soil and avoid the soil damage caused by concentrated fertilizer.
Shallow top dressing is prohibited. Because the sealing performance is good in the greenhouse, the shallow top dressing or spreading fertilizer can easily make the volatile fertilizer harmful to the vegetables. Therefore, when applying fertilizer, it must be applied or applied in a depth of 5 to 6 cm. In addition, it should be kept at a distance of 8 to 10 cm from the root of the vegetable.
Apply nitrogen fertilizer at a suitable temperature. The application of nitrogen fertilizer should be carried out around noon on a sunny day. Too late and too late will reduce the effect of top dressing due to low temperature. When applying nitrogen fertilizer, it is best to use a 0.5% to 1% urea solution at 15 °C or above for root dressing.