根中氮、磷、钾、钙、镁含量随根径的增大而减少。
The content of n, P, K, Ca and Mg in root decreased as root diameter increased.
根系抗拉强度与根径间呈幂函数或指数函数的关系，随根径增大而减小。
Either power or exponential relations were fitted between root tensile strength and root diameter, and the root tensile strength decreased with increasing diameter.
用蒸腾计法和解剖学方法分别研究了氮亏缺对玉米单根径、轴向导度的影响。
The results indicated that N deficiency decreased root radial and axial hydraulic conductivity of maize.
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