我出生于1773年,学名叫“碳酰二胺”。因为当初是罗雷从“尿液”中把我提取出来的,所以人们给我起个乳名叫“尿素”。目前,我是最受欢迎的氮肥,我的含氮量高达44～48％,增产作用十分显著,所以人们又送给我一个绰号:“氮肥中的大力士”。尽管大家经常施用,但是对我的性格、脾气、用途和用法等并不完全了解。为了使我的本领能充分施展,为了使您的作物健壮生长和取得高产,请听听我的自述。 现在的我,是用氨(NH_3)和二氧化碳(CO_2)为原料,在高温高压条件下合成的。在正常情况下,我是白色针状结晶,无臭、无味,略有吸湿性。我易溶于水,是生理中性及化学中性肥料,不含副成分。即使连年施用,也不会破坏土壤结构。 在土壤中,只有在尿素细菌分泌的脲酶作用下,我才能转化为碳酸铵,被作物直接吸收利用。所以,用我作追肥,应比铵态氮肥提前几天施用。当我转化成碳酸铵的时候很不稳定,常在土壤中或土壤表面分解成游离态氨(NH_3)而挥发到大气中。因此,用我作追肥,要深施覆土。我宜作旱田追肥,玉米、高梁、谷子等作物可在 I was born in 1773 with the scientific name “Carbamide.” Because originally Luo Lei extracted from me “urine”, so people gave me a name of milk called “urea.” At present, I am the most popular nitrogen fertilizer, and my nitrogen content is as high as 44 ~ 48%. The effect of increasing yield is very remarkable. So people gave me a nickname: “Hercules in Nitrogen Fertilizer”. Although you often use, but my character, temper, use and usage are not fully understood. In order for my skills to be fully developed, listen to my readiness to make your crop robust and yielding. Now I am ammonia (NH_3) and carbon dioxide (CO_2) as raw materials, synthesized under high temperature and pressure conditions. Under normal circumstances, I am white needle crystal, odorless, tasteless, slightly hygroscopic. I am soluble in water, is a neutral and chemically neutral chemical fertilizers, without the sub-ingredient. Even if applied year after year, it will not damage the soil structure. In the soil, only urea urease secreted by urea bacteria, I can be converted to ammonium carbonate, the crop is absorbed directly. So, with my top-dressing, should be applied a few days earlier than ammonium nitrogen fertilizer. When I am converted to ammonium carbonate, it is very unstable and is often decomposed into free ammonia (NH_3) in the soil or on the surface of the soil and volatilized into the atmosphere. Therefore, with me as fertilizer, to deep soil cover. I should make top dressing in the field, corn, sorghum, millet and other crops can be