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First, the utilization rate of fertilizer is reduced. If the ammonium bicarbonate and urea are applied too much, the soil is difficult to adsorb and preserve, and the crops are difficult to absorb at one time. When it is rained, it will dissolve and infiltrate, resulting in loss of fertilizer.
Second, it will reduce the cold resistance of autumn and winter crops. Excessive application of these nitrogen fertilizers will accelerate the extraction and long-term growth of the leaves, resulting in an imbalance of carbon and nitrogen ratios in the crops, which will reduce the carbon compounds in the crops, causing the autumn and winter crops such as wheat seedlings to grow wild and have poor cold resistance; In the soil tillage layer, the roots of autumn and winter crops will be absorbed and utilized nearby, and the root system will no longer grow downward and deep, forming the “inertness†of the root system, resulting in short roots and reducing the drought resistance and lodging resistance of the crops. Excessive nitrogen fertilizer, easy to spread unevenly, lightly affect germination and emergence, but also cause burning, burning roots and lack of seedlings and ridges.
Remedy. When the main stem of the wheat seedling grows 5 leaves, it is 5 to 7 cm deep in the wheat line, cutting off some secondary roots, controlling nutrient absorption, reducing tillering, and cultivating strong seedlings. (Wang Yutang, Agricultural Committee of Dongping County, Shandong Province)
Farmers Daily
For a long time, farmers have a tendency to heavy fertilizers and light organic farmland organic fertilizers, as well as autumn and winter crops. Farmers suspect that farmyard manure covers a large area, is difficult to transport, and is inconvenient to apply. It is not as effective as chemical fertilizers for early growth and quick-release of wheat and other crops. Therefore, some farmers are accustomed to applying 80-100 kg of ammonium bicarbonate per acre when planting autumn and winter crops. Urea 60 ~ 80 kg, this method of single application of nitrogen fertilizer often has some adverse consequences.
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