Garden plants urea use eight taboos

Urea easy to use, high fertilizer efficiency, is a popular favorite garden maintenance manager Su nitrogen fertilizer. It can be used as a base fertilizer, top dressing, and as a top dressing. If administered properly, not only a waste of fertilizer, but also cause "fertilizer damage," harm plants. Therefore, you must pay attention to "eight bogey" when applying urea.

One bogey mixed with alkaline fertilizer or simultaneous application   Alkaline fertilizers include plant ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer, and the like. 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.

Two bogey   Urea is used as a seed fertilizer. Due to the toxic effects of concentrated biuret, the seeds lose their 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.

Watering immediately after the three bogey   The amide nitrogen 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. Given these properties of urea, urea topdressing after, before the unconverted its completion, not watering, otherwise wastage. 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   Urea shallow nutrient is volatile and 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.

Five bogey usage is too large   The nitrogen content of urea is 44 % to 48 %, the nutrient content is high, and the application amount should not be too large, so as to avoid unnecessary waste and "fat damage".

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 bogey is too late   The application of urea too late is not conducive to the exertion of fertilizer efficiency, so it should generally be applied 4 to 7 days earlier than other nitrogen fertilizers .

Eight bogey single application   Urea should be combined with organic fertilizers and phosphorus and potassium fertilizers to meet the needs of various nutrients in plants. The mixing urea and superphosphate administration, ammonium bisulfate can be made into stable unstable ammonium phosphate, can accelerate the conversion and decomposition of urea, so that nitrogen may be to rapidly absorbed by crops, improve the utilization of urea.