Urea is easy to use and has high fertilizer efficiency. It is a favorite nitrogen fertilizer for farmers. It can be used as a basal fertilizer, topdressing fertilizer, but also as a top-dressing fertilizer. Improper application will not only cause waste of fertilizer, but also cause “fat harm†and harm crops. Therefore, we must pay attention to "eight bogeys" when applying urea.
A bogey and alkaline fertilizer mixed or simultaneous application. Basic fertilizers include grass ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer. If mixed urea is applied or applied at the same time, the nitrogen in urea will become ammonia and volatilize. 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.
Second taboo for fertilizer. Urea as a seed fertilizer, due to the toxic effects of the concentrated biuret will make the seed lose its germination and endanger the seedlings. At the same time, because high-concentration urea can damage the protein structure of seeds and have toxic and inhibitory effects on seeds, it is not suitable for seed fertilizers. If it must be applied as a seed fertilizer, avoid seed and fertilizer contact and control the amount.
Three bogey water immediately after application. Ammonium nitrogen has very low adsorption capacity with soil colloids, and its fluidity and leaching loss in soil is not less than that of nitrate nitrogen fertilizers. In view of these properties of urea, after topdressing urea, do not water it before it is converted, otherwise it will be wasteful. Normal summer and autumn seasons should be watered 2 to 3 days after application, and winter and spring season should be watered after 7 to 8 days. Rice topdressing urea should also control the water in the shallow water layer, cultivating after planting, so that the soil, fertilizer, and urea can not be applied before heavy rain.
Four bogey shallow Shi. The shallow urea nutrient is volatile and is easily consumed by weeds. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. As topdressing points should be applied next to the seedlings or in the ditch side of the seedlings, the depth should also be about 10 to 15 cm. In this way, most of the urea can concentrate on the root-dense layer by moving, which facilitates crop absorption and utilization.
5. Avoid excessive usage. Urea nitrogen content is 44% to 48%, nutrient content is high, the amount should not be too large, so as to avoid unnecessary waste and "fat damage", the general dry field application rate per acre of 5 to 15 kg, paddy field application rate per acre 15 To 20 kg.
Six bogey high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Usually, the concentration of corn, wheat, rice, and cotton is 2%; vegetables and fruits are 0.5% to 1%; fruit trees are 0.5% to 1.5%.
Seven bogey applications too late. The application of urea too late is not conducive to the exertion of fertilizer efficiency, and it is easy to cause the crop to become greedy and late, so it should generally be applied 4 to 7 days earlier than other nitrogen fertilizers.
Eight bogey single application. Urea should be applied in combination with organic fertilizers, phosphorus, and potassium fertilizers to meet the needs of various crop nutrients. If urea is mixed with superphosphate, the unstable ammonium bisulfate 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 increase the utilization of urea.
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