sch.3-sec.16Meaning of soil water storage

### sch.3-sec.16 Meaning of soil water storage Soil water storage is the amount of total water stored in a soil profile that is available for plant use, expressed as millimetres of water from the surface to the effective rooting depth of the soil. For subsection (1) — the amount may be worked out by— a combination of laboratory measurement and the soil texture look-up table using the methodology under subsection (4) ; or a combination of laboratory measurement and pedotransfer functions approved by the chief executive using the methodology under subsection (5) ; or any other method approved by the chief executive; and the effective rooting depth of the soil is the shallowest of the following for the soil— its soil depth; the depth of any soil physico-chemical limitation for the soil; a depth of 1,000mm. However, the soil texture look-up table can not be used if the value worked out by using the table is within 15% of the amount stated in part 2 , criterion 8 for the zone. For subsection (2) (a) (i) , the methodology is— the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and the soil texture class must be worked out by applying the particle size fractions determined in paragraph (a) to the triangular texture diagram in figure 16 in the field handbook; and the soil water storage for the soil texture class worked out under paragraph (b) is the value worked out using the soil texture look-up table. For subsection (2) (a) (ii) , the methodology is— the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and the gravimetric water content at the lower limit must be measured at a soil water potential of negative 1,500kPa; and the soil water storage is the value worked out using the pedotransfer functions. In this section— pedotransfer function means an empirically derived mathematical equation or algorithm that allows the prediction of a difficult-to-measure soil attribute using more readily measurable soil parameters or pedological properties. soil texture look-up table means the following table, using the soil texture classes under the field handbook— Soil texture Estimated soil water storage per 100mm of soil depth (in mm) sand, clayey sand or loamy sand 4 sandy loam 5 loam, silty loam or sandy clay loam 6 clay loam, sandy clay loam or silty clay loam 8 silty clay or clay less than 45% clay 10 clay equal to or greater than 45% clay 12 Individual values for each increment or soil layer are summed to the effective rooting depth to give the soil water storage. (sch.3-sec.16-ssec.1) Soil water storage is the amount of total water stored in a soil profile that is available for plant use, expressed as millimetres of water from the surface to the effective rooting depth of the soil. (sch.3-sec.16-ssec.2) For subsection (1) — the amount may be worked out by— a combination of laboratory measurement and the soil texture look-up table using the methodology under subsection (4) ; or a combination of laboratory measurement and pedotransfer functions approved by the chief executive using the methodology under subsection (5) ; or any other method approved by the chief executive; and the effective rooting depth of the soil is the shallowest of the following for the soil— its soil depth; the depth of any soil physico-chemical limitation for the soil; a depth of 1,000mm. (sch.3-sec.16-ssec.3) However, the soil texture look-up table can not be used if the value worked out by using the table is within 15% of the amount stated in part 2 , criterion 8 for the zone. (sch.3-sec.16-ssec.4) For subsection (2) (a) (i) , the methodology is— the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and the soil texture class must be worked out by applying the particle size fractions determined in paragraph (a) to the triangular texture diagram in figure 16 in the field handbook; and the soil water storage for the soil texture class worked out under paragraph (b) is the value worked out using the soil texture look-up table. (sch.3-sec.16-ssec.5) For subsection (2) (a) (ii) , the methodology is— the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and the gravimetric water content at the lower limit must be measured at a soil water potential of negative 1,500kPa; and the soil water storage is the value worked out using the pedotransfer functions. (sch.3-sec.16-ssec.6) In this section— pedotransfer function means an empirically derived mathematical equation or algorithm that allows the prediction of a difficult-to-measure soil attribute using more readily measurable soil parameters or pedological properties. soil texture look-up table means the following table, using the soil texture classes under the field handbook— Soil texture Estimated soil water storage per 100mm of soil depth (in mm) sand, clayey sand or loamy sand 4 sandy loam 5 loam, silty loam or sandy clay loam 6 clay loam, sandy clay loam or silty clay loam 8 silty clay or clay less than 45% clay 10 clay equal to or greater than 45% clay 12 Individual values for each increment or soil layer are summed to the effective rooting depth to give the soil water storage. - (a) the amount may be worked out by— (i) a combination of laboratory measurement and the soil texture look-up table using the methodology under subsection (4) ; or (ii) a combination of laboratory measurement and pedotransfer functions approved by the chief executive using the methodology under subsection (5) ; or (iii) any other method approved by the chief executive; and - (i) a combination of laboratory measurement and the soil texture look-up table using the methodology under subsection (4) ; or - (ii) a combination of laboratory measurement and pedotransfer functions approved by the chief executive using the methodology under subsection (5) ; or - (iii) any other method approved by the chief executive; and - (b) the effective rooting depth of the soil is the shallowest of the following for the soil— (i) its soil depth; (ii) the depth of any soil physico-chemical limitation for the soil; (iii) a depth of 1,000mm. - (i) its soil depth; - (ii) the depth of any soil physico-chemical limitation for the soil; - (iii) a depth of 1,000mm. - (i) a combination of laboratory measurement and the soil texture look-up table using the methodology under subsection (4) ; or - (ii) a combination of laboratory measurement and pedotransfer functions approved by the chief executive using the methodology under subsection (5) ; or - (iii) any other method approved by the chief executive; and - (i) its soil depth; - (ii) the depth of any soil physico-chemical limitation for the soil; - (iii) a depth of 1,000mm. - (a) the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and - (b) the soil texture class must be worked out by applying the particle size fractions determined in paragraph (a) to the triangular texture diagram in figure 16 in the field handbook; and - (c) the soil water storage for the soil texture class worked out under paragraph (b) is the value worked out using the soil texture look-up table. - (a) the particle size fractions must be worked out using the particle diameters in the recommended scale in figure 15 in the field handbook; and - (b) the gravimetric water content at the lower limit must be measured at a soil water potential of negative 1,500kPa; and - (c) the soil water storage is the value worked out using the pedotransfer functions.