Urea is easy to use and has high fertilizer efficiency. It is a nitrogen fertilizer that is popular among garden maintenance managers. It can be used as a base fertilizer, top dressing, and as a top dressing. If it is not applied properly, it will not only cause waste of fertilizer, but also cause "fertilization" and harm plants. Therefore, you must pay attention to "eight bogey" when applying urea.
One bogey mixed with alkaline fertilizer or simultaneous application of alkaline fertilizers include plant ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer. If mixed urea is applied or applied at the same time, the nitrogen in the urea will be aggravated by ammonia. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 3 to 4 days, and winter and spring should be staggered for 7 to 8 days.
The second is used as a seed fertilizer. Urea is used as a seed fertilizer. Due to the toxic effect of concentrated biuret, the seed will lose its germination power and endanger the seedlings. At the same time, because high concentration of urea can destroy the protein structure of the seed, it is also toxic and inhibiting to the seed, so it is not suitable for seed fertilizer. If it is necessary to apply as a seed fertilizer, avoid contact with seeds and fertilizers and control the dosage.
Immediately after the application of water, the nitrogen in the amide state has a low adsorption capacity with the soil colloid, and its fluidity and leaching in the soil is not smaller than that of the nitrate nitrogen. In view of these properties of urea, after surging urea, do not water before it is not converted, otherwise the waste is large. Generally, summer and autumn seasons should be watered 2 to 3 days after application, and winter and spring seasons should be watered after 7 to 8 days. No urea can be applied before heavy rain.
Four bogey shallow application Urea shallow nutrient is easy to be consumed by weeds. Deep application of urea, melt fertilizer in the soil, so that the fertilizer is in the moist soil layer, is conducive to the performance of fertilizer. For the topdressing should be applied to the seedlings or the ditch on the side of the seedling, the depth should also be about 10 to 15 cm. In this way, urea can be concentrated in the root dense layer by moving, which is convenient for crop absorption and utilization.
The amount of nitrogen used is too high. The nitrogen content of urea is 44% to 48%. The nutrient content is high, and the application rate should not be too large, so as to avoid unnecessary waste and “fat damageâ€.
Six bogey high-concentration foliar application Foliar spray should avoid excessive concentration of urea solution, otherwise it will burn out the leaves and poison the plants. The landscaping trees are preferably 0.5% to 1.5%.
Seven-time application is too late. Urea application is too late, which is not conducive to the effect of fertilizer efficiency. Therefore, it should be applied 4 to 7 days earlier than other nitrogen fertilizers.
Eight bogey single application Urea should be combined with organic fertilizer and phosphorus, potassium fertilizer, etc. to meet the needs of various nutrients of plants. For example, when urea is mixed with superphosphate, the unstable ammonium hydrogen sulfate can be converted into stable ammonium phosphate, which can accelerate the conversion and decomposition of urea, so that the available nitrogen can be quickly absorbed by the crop and improve the utilization rate of urea.
Author: Xue Yanli
One bogey mixed with alkaline fertilizer or simultaneous application of alkaline fertilizers include plant ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer. If mixed urea is applied or applied at the same time, the nitrogen in the urea will be aggravated by ammonia. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 3 to 4 days, and winter and spring should be staggered for 7 to 8 days.
The second is used as a seed fertilizer. Urea is used as a seed fertilizer. Due to the toxic effect of concentrated biuret, the seed will lose its germination power and endanger the seedlings. At the same time, because high concentration of urea can destroy the protein structure of the seed, it is also toxic and inhibiting to the seed, so it is not suitable for seed fertilizer. If it is necessary to apply as a seed fertilizer, avoid contact with seeds and fertilizers and control the dosage.
Immediately after the application of water, the nitrogen in the amide state has a low adsorption capacity with the soil colloid, and its fluidity and leaching in the soil is not smaller than that of the nitrate nitrogen. In view of these properties of urea, after surging urea, do not water before it is not converted, otherwise the waste is large. Generally, summer and autumn seasons should be watered 2 to 3 days after application, and winter and spring seasons should be watered after 7 to 8 days. No urea can be applied before heavy rain.
Four bogey shallow application Urea shallow nutrient is easy to be consumed by weeds. Deep application of urea, melt fertilizer in the soil, so that the fertilizer is in the moist soil layer, is conducive to the performance of fertilizer. For the topdressing should be applied to the seedlings or the ditch on the side of the seedling, the depth should also be about 10 to 15 cm. In this way, urea can be concentrated in the root dense layer by moving, which is convenient for crop absorption and utilization.
The amount of nitrogen used is too high. The nitrogen content of urea is 44% to 48%. The nutrient content is high, and the application rate should not be too large, so as to avoid unnecessary waste and “fat damageâ€.
Six bogey high-concentration foliar application Foliar spray should avoid excessive concentration of urea solution, otherwise it will burn out the leaves and poison the plants. The landscaping trees are preferably 0.5% to 1.5%.
Seven-time application is too late. Urea application is too late, which is not conducive to the effect of fertilizer efficiency. Therefore, it should be applied 4 to 7 days earlier than other nitrogen fertilizers.
Eight bogey single application Urea should be combined with organic fertilizer and phosphorus, potassium fertilizer, etc. to meet the needs of various nutrients of plants. For example, when urea is mixed with superphosphate, the unstable ammonium hydrogen sulfate can be converted into stable ammonium phosphate, which can accelerate the conversion and decomposition of urea, so that the available nitrogen can be quickly absorbed by the crop and improve the utilization rate of urea.
Author: Xue Yanli
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