Soil samples were dried to a constant weight at 105°C to determine soil moisture (SM). Soil temperature (ST) was measured by a soil moisture and temperature sensor (Shunkeda TR‐8D, China). Soil pH was measured in a 1:2.5 soil–water solution with a pH meter (Thermo Fisher Scientific Inc., USA). Soil total carbon (STC) and soil total nitrogen (STN) were determined by the combustion method using an automatic elemental analyzer (Elementar Analyzer System Vario MACRO CUBE, German). Soil total phosphorus (STP) was determined by the ablation method using an inductively coupled plasma atomic emission spectrometer (Thermo ICAP 6000 SERIES, USA). Spatial variables include the longitude and the latitude.
Analyzer system vario macro cube
Manufactured by Elementar
Sourced in Germany
The Analyzer System Vario MACRO CUBE is a versatile lab equipment designed for elemental analysis. It provides high-precision measurements of carbon, hydrogen, nitrogen, and sulfur content in a wide range of samples.
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Lab products found in correlation
2 protocols using analyzer system vario macro cube
1
Comprehensive Soil Physicochemical Analysis
2
Comprehensive Physicochemical Analysis of Samples
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The physicochemical properties of samples were determined using international standard test methods. The total nitrogen (TN) was assayed using the H 2 SO 4 -H 2 O 2 digestion method determined with a SmartChem2000 (Skalar, Breda, the Netherlands). The dissolved organic matter was analyzed using a total organic carbon analyzer (TOC-L) (Shimadzu, Kyoto, Japan). The total carbon (TC) was determined directly by an element analyzer (Elemental Analyzer System Vario MACRO cube, Elementar, Langenselbold, Germany). The temperature was measured each afternoon through electronic thermometer. The pH and EC were determined by pH and conductivity meters. The above indicator was tested as described elsewhere (Ye et al., 2021) . The contents of humic acid (HA) and fulvic acid (FA) were determined by the dinitrosalicylic acid and ninhydrin colorimetric methods, respectively (Cao et al., 2013) . The contents of humus and its components were determined by standard measures (Wang et al., 2022) .
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