尿素是目前固体氮肥中含氮量最高的氮肥品种,具有物理性状好、肥效高等优点,是今后氮肥发展的主要品种之一。但它施入土壤后须经尿素酶的转化才能被作物吸收利用,而在转化过程中,常会造成氨的挥发损失,影响肥效,尤以在石灰性土壤上更为明显。通常认为,它不能被土壤胶体吸附,易引起随水流失,因此必须注意合理的施肥方法。 Urea is the most nitrogen-containing nitrogenous fertilizer in solid nitrogen fertilizer with good physical properties and high fertilizer efficiency. It is one of the main varieties of nitrogen fertilizer in the future. However, after it is applied to the soil, it needs to be converted into urease to be absorbed by crops. In the process of transformation, ammonia volatilization loss is often caused, affecting the efficiency of fertilizer, especially in calcareous soil. It is generally believed that it can not be adsorbed by soil colloids and can easily lead to water loss. Therefore, proper fertilization methods must be taken into account.