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Revisiting penetrometer models for estimating root elongation
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2024-12-17 , DOI: 10.1016/j.still.2024.106400
Renato Paiva de Lima, Cássio Antonio Tormena, Moacir Tuzzin de Moraes, Zigomar Menezes de Souza, Mário Monteiro Rolim, Maurício Roberto Cherubin

Mechanical impedance has been reported as a major factor reducing root elongation. Penetrometer is the main tool for diagnosing mechanical soil conditions regarding root growth; however, soil mechanics processes influence root cavity expansion, friction and adhesion at the soil-metal interface which can induce root-related measurement overestimations. Models based on penetrometers have been used to estimate root elongation and assign penetration resistance thresholds, which have been used to determine soil physical limitation for plant development. In this paper, we revisited soil mechanical aspects modeling considering root-soil and penetrometer-soil interfaces, including calculation examples. Moreover, we revisited the application of penetration resistance threshold in soil integrated physical indices for root and plant growth. Our calculations showed that friction is a major factor inducing overestimates at penetrometer-soil interfaces. However, current mathematical models enable estimating normal stress for cavity expansion by removing the effect of soil adhesion and friction, and reducing the impact of penetrometer cone tip angle on soil-metal friction. Additionally, we estimated root elongation rate for a series of plant species as a function of penetrometer resistance which could be applied to soil physical indices for estimating limit plant growth threshold.

中文翻译:


重新审视针入度计模型以估计根部伸长率



据报道,机械阻抗是降低根伸长率的主要因素。渗透计是诊断根系生长机械土壤状况的主要工具;然而,土壤力学过程会影响土壤-金属界面的根腔扩张、摩擦和粘附,这会导致与根相关的测量高估。基于渗透计的模型已被用于估计根系伸长率并分配穿透阻力阈值,这些阈值已被用于确定植物发育的土壤物理限制。在本文中,我们重新审视了考虑根-土和渗透计-土壤界面的土壤力学方面建模,包括计算示例。此外,我们重新审视了抗穿透阈值在根和植物生长的土壤综合物理指标中的应用。我们的计算表明,摩擦是导致渗透计-土壤界面高估的主要因素。然而,目前的数学模型可以通过消除土壤粘附和摩擦的影响,并减少针探仪锥尖角度对土壤-金属摩擦的影响,来估计空腔膨胀的法向应力。此外,我们估计了一系列植物物种的根伸长率作为渗透仪阻力的函数,这可以应用于土壤物理指标,以估计极限植物生长阈值。
更新日期:2024-12-17
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