Improper fertilization aggravates diseases by burning seedlings matters needing attention in fertilization of vegetables in greenhouse

At present, many greenhouse vegetables due to improper fertilization caused by burning seedlings, disease aggravation and other phenomena. According to the typical experience of scientific fertilization of greenhouse vegetables summarized by experts, five points should be paid attention to in fertilization of greenhouse cultivated vegetables:

Fertilization of greenhouse vegetables

1. Appropriate application of chemical fertilizer:

Because greenhouse vegetables have protective facilities, the soil cannot be fully rinsed by rainwater, and fertilizer is not easy to leach, so excessive application of chemical fertilizer easily causes salt to accumulate in the soil surface layer, which may affect vegetable growth in light or lead to soil salinization in serious cases. Therefore, before fertilization, it is necessary to diagnose soil nutrients, formulate reasonable formula fertilization scheme, and prevent blind excessive application of quick-acting fertilizer.

II. Pay attention to increasing potassium fertilizer application:

Potassium fertilizer application on melon and eggplant vegetables had obvious yield increase effect, which was due to the partial application of nitrogen and phosphorus fertilizer with the greenhouse vegetables in successive years, resulting in the weakening of soil potassium supply capacity with the increase of planting years and vegetable yield. According to experiments, greenhouse cucumber, potassium oxide 7.5 kg per mu, showing strong stems, leaves fresh green, plump, straight melon; winter Chinese cabbage, yield and quality have significantly improved. It should be noted that when selecting potash varieties, it is best not to use potassium chloride to avoid soil salinization.

Third, topdressing should be a small number of times:

Vegetables need more fertilizer, in addition to applying sufficient base fertilizer, but also need to carry out topdressing, topdressing, to a small number of times, so that one can prevent nutrient loss, two can give full play to fertilizer efficiency, improve fertilizer utilization rate.

4. What is the lack of micro-fertilizer?

Although the requirement of vegetables for trace elements is small, trace fertilizers are indispensable nutrients involved in the physiological functions of vegetables. For example, trace elements in soil are insufficient, vegetables will have different deficiency symptoms, yield will decrease, and quality will decrease. If the content of trace elements in the soil is too much, it will cause vegetable poisoning, which will also cause yield reduction and quality reduction. Therefore, the application of trace elements must be carried out according to the soil test results and vegetable deficiency phenomenon, and must be based on the principle of what is lacking.

5. The topdressing outside the root should be accurate:

Foliar fertilizer spraying method is simple, save labor and time, can avoid excessive watering caused by soil moisture, resulting in increased vegetable susceptibility rate, but also can quickly supplement nutrients, but to grasp the application concentration, otherwise easy to produce fertilizer damage,"burn" leaves, general foliar fertilizer concentration: urea 1%, potassium dihydrogen phosphate 0.2 - 0.5%, diammonium phosphate 1%, zinc sulfate 0.1 - 0.2%, manganese sulfate 0.1 - 0.2%, borax 0.1 - 0.2%, ammonium molybdate 0.05 - 0.1%, copper sulfate 0.02 - 0.2%, ferrous sulfate 0.2 - 1%.