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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Low-Input Estimation of Site-Specific Lime Demand Based on Apparent Soil Electrical Conductivity and In Situ Determined Topsoil pH
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Low-Input Estimation of Site-Specific Lime Demand Based on Apparent Soil Electrical Conductivity and In Situ Determined Topsoil pH

机译：基于表观土壤电导率和现场确定的表层土壤pH的低输入估算特定地点的石灰需求

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摘要

Site-specific liming helps increase efficiency in agricultural production. For adequate determination of the lime demand, a combination of apparent soil electrical conductivity (EC ) and topsoil pH can be used. Here, it was hypothesized that this can also be done at low-input level. Field measurements using the EM38 MK I (Geonics, Canada) were conducted on three experimental sites in north Germany in 2011. The topsoil pH was measured based on two approaches: on the field using a handheld pH meter (Spectrum-Technologies Ltd., Bridgend, UK) with a flat electrode (in situ), and in the lab using standard equipment (ex situ). Both soil EC (0.4–35.9 mS m ) and pH (5.13–7.41) were heterogeneously distributed across the sites. The same was true of the lime demand (−1.35–4.18 Mg ha ). There was a significant correlation between in situ and ex situ determined topsoil pH (r = 0.89; < 0.0001). This correlation was further improved through non-linear regression (r = 0.92; < 0.0001). Thus, in situ topsoil pH was found suitable for map-overlay with EC to determine the site-specific lime demand. Consequently, the hypothesis could be confirmed: The combined use of data from EM38 and handheld pH meters is a promising low-input approach that may help implement site-specific liming in developing countries.
机译：特定地点的灰泥有助于提高农业生产效率。为了充分确定石灰的需求，可以结合使用表观土壤电导率（EC）和表土pH值。在此假设，这也可以在低输入水平下完成。 2011年，使用EM38 MK I（加拿大Geonics，加拿大）在德国北部的三个实验点进行了实地测量。表土的pH值基于两种方法进行测量：使用手持式pH计（Spectrum-Technologies Ltd.，Bridgend）进行实地测量。 （英国），使用扁平电极（原位），并在实验室中使用标准设备（非原位）。土壤EC（0.4–35.9 mS m）和pH（5.13–7.41）均分布在不同地点。石灰需求量（−1.35-4.18 Mg ha）也是如此。在原位和异位测定的表土pH之间存在显着相关性（r = 0.89； <0.0001）。通过非线性回归进一步改善了这种相关性（r = 0.92； <0.0001）。因此，发现原位表层土壤的pH值适合与EC进行地图叠加，以确定特定地点的石灰需求。因此，该假设可以得到证实：EM38和手持式pH计数据的组合使用是一种有前途的低投入方法，可能有助于在发展中国家实施特定于现场的撒石灰。

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