1. It is not advisable to apply ammonium nitrate fertilizer to green leafy vegetables. Such as cabbage, Chinese cabbage, leeks, celery, spinach, lettuce, etc., the growth period is short, easy to absorb nitrate nitrogen fertilizer. For example, if the ammonium nitrate fertilizer is applied, the green leaf vegetables absorb nitrate ions. When the salt enters the human body, it will cause cumulative poisoning after long-term consumption.
2. It is not advisable to spray nitrogen fertilizer on the foliage before picking green leafy vegetables. This is because the green leaf in the edible part of the green leafy vegetables will increase the content of nitrate significantly after spraying urea, ammonium sulfate or human urine solution, which will cause serious pollution of the vegetables and affect the quality.
3. It is not advisable to irrigate the water immediately after applying urea in vegetable fields. The nitrogen content in urea is an amide. Under the action of urease secreted by soil microorganisms, the nitrogenous amine is absorbed into the roots of vegetables by ammonium carbonate or ammonium hydrogencarbonate, or is preserved by soil absorption. If the urea is immediately flooded or exposed to rain, the nitrogen in the amide state will be lost with water, and the loss will be greater than that of ammonium nitrate. Therefore, whether urea is used as base fertilizer or top dressing, it should be applied for 5-7 days after the application, so that all the conversion is completed and then water is poured to avoid loss.
4. It is not advisable to apply ammonium sulfate several times in succession. In acidic or calcareous soils, if the ammonium sulfate is applied multiple times in succession, the acidic soil becomes more acidic. Calcareous soils cause compaction, which seriously affects the normal growth of vegetables.
5. It is not advisable to apply ammonium bicarbonate to dry plots. Ammonium bicarbonate is extremely unstable and volatile, especially in the case of drought and water shortage. Therefore, the application of ammonium bicarbonate in the vegetable field, whether as a base fertilizer or top dressing, should be covered immediately after application, in case of dry weather, water should be applied or watered after application.
6, the amount of phosphate fertilizer should not be too much. If the vegetable field is applied with a large amount of phosphate fertilizer, the supply of phosphate fertilizer will be too much, which will seriously affect the growth and development of vegetables, causing premature aging of vegetable plants, poor growth, reduced yield and deteriorating quality. Generally, 15-30 kg of phosphate fertilizer per mu is suitable.
7, it is not appropriate to apply unfertilized human and animal waste. Because the unfertilized human excrement contains many infectious bacteria and parasite eggs. If the manure is directly applied to the green leafy vegetables without being piled up or disinfected, it will cause serious pollution of the vegetables, leading to the occurrence of various infectious diseases and the spread of parasitic diseases. Human excrement should be applied after being harmlessly treated by sealed stacking, biogas fermentation or drug treatment. Due to the large amount of weed seeds mixed in livestock manure, it will cause vegetable and grass damage after fertilization. Therefore, it must be stored at high temperature (50-70 ° C) for 1-2 months before application.
Source: HC Network
"Seven unsuitable" for fertilizing vegetable fields
Vegetable production is favored by farmers' friends because of its high economic efficiency. However, in actual production, due to the lack of knowledge of scientific fertilizers, the fertilizer efficiency is not high, and even fat damage and pollution are caused. Here are some suggestions for fertilizing the vegetable fields for reference by the farmers.
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