用时域反射法(TDR)控制生长介质的含水量

Agronomie Pub Date : 2004-07-01 DOI:10.1051/AGRO:2004023
P. Morel, J. Michel
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引用次数: 11

摘要

盆栽作物的灌溉需要大量的后续处理,因为与植物的需水量相比,生长介质的水分储备自主性较低。因此,灌溉管理的计算机化系统正在研究之中。采用时域反射法(TDR)对珍珠岩或堆肥树皮分别以0、25、50、75和100%的体积比加入不同的泥炭基混合物进行了测试。得到了每种混合物的含水量和介电常数之间的校准方程(线性或多项式)。除含有100%珍珠岩的混合物外,它们的精密度非常令人满意(r2 > 0.95)。然而,这种方法需要每个生长介质都有一个方程。因此,我们试图建立一个可以适用于二元泥炭基混合物的一般公式。我们测试了二阶多项式校准方程,该方程是测量的介电常数以及添加到泥炭(树皮或珍珠岩)的补充材料的体积百分比的函数。这些方程的精度对所有混合物都很好(r2 > 0.96)。就所有实际目的而言,这种方法将大大简化TDR在计算机化灌溉管理方面的使用,因为它只会在灌溉系统中引入有限数量的参数方程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Control of the moisture content of growing media by time domain reflectometry (TDR)
The irrigation of pot crops requires considerable follow-up because the autonomy of the water reserve of the growing medium is low in relation to plant water requirements. Computerised systems for irrigation management are therefore under investigation. Time domain reflectometry (TDR) was used on different peat-based mixtures to which perlite or composted bark were added in volumetric ratios of 0, 25, 50, 75 and 100%. Calibration equations (linear or polynomial) established between the water content and dielectric constant were obtained for each mixture. Their precision is highly satisfactory (R 2 > 0.95), except for the mixture with 100% perlite. However, this method requires an equation per growing medium. We therefore attempted to establish a general formula that could be applied to binary peat-based mixtures. We tested second-order polynomial calibration equations, a function of the dielectric constant measured as well as the volume percent of complementary material added to the peat (bark or perlite). The precision of these equations is excellent for all mixtures (R 2 > 0.96). For all practical purposes, this approach would considerably simplify the use of TDR for computerised irrigation management because it would introduce only a limited number of parametric equations into the irrigation system.
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