Crops should use extra-root fertilizer timely
Crop top-dressing fertilizer (foliar spray fertilizer) has the advantages of rapid fertilizer efficiency, high utilization rate, convenient application, significant effect, and saving fertilizer.
Crops with deficiency syndromes are usually produced in the field, and some crops often exhibit deficiency of certain elements. At this time, foliar fertilization can be used to make up for lack of cropping, which is highly targeted and the effect of fertilizer is much faster than that of soil topdressing. The symptoms of deficiency can be quickly alleviated.
When the root absorption capacity of the crop is weakening, the demand for nutrients from crops is generally large during the middle and late crop growth. However, the root activity begins to gradually decline and the fertilizer absorption capacity decreases. At this time, in order to meet the demand of crops for nutrients, the effect of using topdressing fertilizers is generally very good, which can effectively make up for the lack of nutrients from the roots. Such as rice, wheat, corn and other cereal crops in the booting, flowering, filling the roots outside the filling period, soybeans, peanuts, beans, beans and other legume crops in the flowering, scab phase dressing, cotton should be outside the roots Top dressing has a significant effect of increasing production.
When the crop growth is affected by adverse environmental impacts, if the soil has too much water or too little drought, the soil becomes too acidic or too alkaline, which will cause the roots of the crop to absorb nutrients. At this time, the method of root application can no longer meet the needs of the crop. It is necessary to take root dressings in time in order to quickly replenish nutrition and meet the needs of growth and development. For example, if the soil is fertilized when the soil is dry, not only can the fertilizer effect not be fully exerted, but also the phenomenon of burning roots can be caused when the concentration of the soil solution suddenly rises. At this time, the method of applying extra-root fertilizer is applied to supplement the nutrition for the crop in a timely manner. Can add moisture to crops and mitigate the adverse effects of drought on crops. For example, after the crop has been damaged, the root absorption capacity is weakened. Before the plant grows, it is timely to carry out extra-root dressing, which plays an important role in promoting the rapid recovery of the plant.
When the fertilization of soil is difficult to operate, the first one is for the application of trace elements, and the top-dressing fertilizer is often used. Because the demand for micro-fertilizer is very small, the soil is applied with micro-fertilizers, which is generally used as basal fertilizer, and the application is slightly inconvenient and easy to produce fertilizer, and the effectiveness of micro-fertilizer is often reduced due to the fixed effect of soil. Taking extra-rooted application, the concentration of thin, small amount, high crop absorption and utilization, but also more economical, so micro-fertilizer is generally promoted outside the root. The second is that for those crops covered with mulch, it is difficult to use the topdressing fertilizer when the application amount of basal fertilizer is insufficient. In this case, the extra-root fertilizer should be used to supplement nutrients. Third, some crops (such as soybeans, peanuts, etc.) have high planting densities and are highly enclosed in the fields at the later stage of growth. Soil topdressing cannot be carried out at all. At this time, taking extra-root fertilizers is the best way to supplement nutrition.
In addition, the growth of crops is hindered by phytotoxicity and growth is weak. The timely addition of nitrogen, phosphorus, potassium or thin human urine can prompt the affected plants to resume growth as soon as possible. Practice has proved that no matter what kind of harm, spraying foliar spray 0.1% ~ 0.3% potassium dihydrogen phosphate solution, or 0.3% urea solution plus 0.2% potassium dihydrogen phosphate mixed spray, every 5 to 7 days once, even Spray 2 or 3 times, can significantly reduce the damage caused by the damage.
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