Garden plant urea uses four taboos
A bogey and alkaline fertilizer mixed application or alkaline fertilizer at the same time including 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 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.
II bogey for fertilizer urea fertilizer, due to the toxic effects of concentrated biuret will make the seeds lose their germination power, 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.
Amino acid nitrogen was watered immediately after the three bogey applications, and the adsorption capacity between colloid and soil was very low. The fluidity and leaching loss in the soil was not less than that of nitrate nitrogen fertilizer. 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. Urea cannot be applied before heavy rain.
Four bogey shallow application of urea nutrients easily volatile, 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.
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