论文部分内容阅读
上期回顾钾元素在地表中循环,受人类活动的影响,钾以钾肥的方式被施于土壤中。然而,这些钾元素有30%-40%流失到地下水中;农耕、放牧和土壤的自然变化消耗了剩下的60%-70%。人类生产制造出的钾肥可以及时补充使土壤中持续富钾,从而促进农业发展。全球热带地区的土壤通常缺乏大量元素和微量元素。虽然一些热带国家是强大的农业生产国,但一般他们对钾肥进口依赖程度很大。这种情况在中国、巴西和印度尤为明显。作为巴西领先的农业研究机构,巴西农业科学院为了改变一些国家对进口钾肥的高度依赖,一直致力于
The last review of potassium elements in the surface circulation, affected by human activities, potassium is applied to the soil in the form of potash. However, 30-40% of these K elements are lost to groundwater; the remaining 60-70% are consumed by the natural changes in farming, grazing and soils. Potassium produced by mankind can be replenished in time so that potassium can be continuously enriched in the soil so as to promote agricultural development. The soils of the world’s tropical regions often lack large amounts of elements and trace elements. Although some tropical countries are powerful agricultural producers, they generally rely heavily on potash imports. This is especially true in China, Brazil and India. As a leading agricultural research institute in Brazil, the Brazilian Academy of Agricultural Sciences has been devoting itself to changing the high dependence of some countries on imported potash