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蔬菜施用化肥不当会产生毒副作用,既浪费肥料还影响人体健康。实践证明,蔬菜施肥应注意以下事项:1.施尿素后不宜浇水。尿素中所含氮成分为酰铵,酰铵态氮肥素在土壤微生物分泌的脲酶作用下,转化为碳酸铵或碳酸氢铵才会被蔬菜根系吸收利用。如果施尿素后马上浇水(或遇到雨淋),酰铵态的氮紊就会流失。所以尿素作蔬菜基肥(或追肥),要经过5-6天,使其全部转化后再浇水,以免造成损失。2.不宜反复施用硫铵。在酸性土壤或石灰性菜地中,若连续多次施用
Improper use of fertilizers in vegetables can have toxic and side effects, which is a waste of fertilizer and affects human health. Practice has proved that vegetables should pay attention to the following matters: 1. After applying urea should not be watering. Nitrogen contained in urea is ammonium, ammonium acylate nitrogen in the soil microorganisms in the secretion of urease, into ammonium bicarbonate or ammonium bicarbonate will be absorbed by the use of vegetable roots. If the water immediately after urea (or encounter rain), ammonium nitrogen amylosis will be lost. So urea as a vegetable basal fertilizer (or top dressing), to go through 5-6 days, make it all and then watering, so as to avoid loss. 2. Should not be repeated application of ammonium sulfate. In acidic soils or calcareous plots, apply multiple times in succession