化肥深施能提高肥效、减少流失,保护环境等益处。但是,并非肥料施得越深越好。以水稻为例。水稻根系的分布是有一定范围的,根系的伸展也是逐步由浅到深,如果施得过深,不仅费工而且也不能及时发挥肥效,容易造成水稻前期脱肥,后期贪青迟熟。导致减产。水稻的根系一般根群横向可达40厘米,深度达50～60厘米,大部分根群则集中在20厘米的土层内。据测定,水稻从分蘖到抽穗期这一生育阶段中有68％～100％的根系分布在10厘米左右的土层中,此阶段, Fertilizer deep application can improve fertilizer efficiency, reduce losses, environmental protection and other benefits. However, it is not the deeper the fertilizer is applied. Take rice as an example. Rice root distribution is a certain range, the root of the stretch is gradually from light to deep, if too deep, not only costly but also can not play a timely effect, likely to cause rice pre-fattening late late greed green late. Lead to cut. Roots of rice generally horizontal group of up to 40 cm horizontal, depth of 50 to 60 cm, most of the root group is concentrated in 20 cm of soil. According to the determination of rice from tillering to heading stage of this fertility stage, 68% to 100% of the root distribution in about 10 cm of soil, this stage,