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不同作物根系发育程度不同,即使同一作物不同生长期,根系在土层中分布的深度也不相同。合理施肥应该把肥料大部分施在根系密集的层次,施在根系活力最强的部位,这样有利于作物的吸收。作物根系在土壤中的分布,多数与地面呈300°～600°的夹角。随着地上部植株的生长,根系在土壤中的分布面积与深度随之增加。对一年生大田作物,其生育期间的绝大部分根系分布在地面以下5～20cm的耕层内。为了使施用的肥料能尽量接近吸收根系,增加被作物的吸收量和提高肥效,现代施肥技术都很重视施肥的深度。基本趋势是减少和避免表面施用,增加施肥深度。不同施肥深度对肥料的增产效果和利用率有明显影响。
Roots of different crops have different degrees of development. Even if the same crop is in different growth stages, the depth of root distribution in the soil is not the same. Reasonable fertilization should be applied to most of the fertilizers in the dense root system, applied to the roots of the strongest parts of the vitality, which is conducive to the absorption of crops. Crop root distribution in the soil, most of the ground with the angle of 300 ° ~ 600 °. With the growth of above-ground plants, the distribution area and depth of roots in the soil increased accordingly. For annual field crops, the majority of their roots during their reproductive development are distributed in the topsoil 5-20 cm below the ground. In order to make the application of fertilizer as close as possible to absorb the root system, increase the amount absorbed by crops and improve fertilizer efficiency, modern fertilization technology attaches great importance to the depth of fertilization. The basic trend is to reduce and avoid surface application and increase fertilizer application depth. Different fertilization depth has a significant impact on fertilizer yield and utilization efficiency.