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soil water status

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Catalogue: GRDC Updates (West)
The decline in profitability of the high rainfall farm is driven by declining terms of trade rather than the yield reductions under predicted climate change... Farmers and advisors still require a simple method to estimate yield potential using a simple spreadsheet or 'back of the envelope' type calculations... The soil moisture values calculated by STIN XL for sowing dates later than 1 April were seen as an underestimate...
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Catalogue: GRDC Updates
Graph two is for a heavy clay Black Vertosol from Spring Ridge; results show the plant available water capacity (PAWC) is 272mm... Rooting depth should be determined through perusal of physical and chemical data and the physical observation of roots and water extraction through soil coring and/or electronic monitoring... Simulation of water storage using the >100 year climate record shows that a short fallow from wheat (assuming a dry soil profile at harvest in November of the previous year) results in a 50% chance of at least 110mm (range of 0-300mm) of water being available for an April planting at Spring Ridge and 80mm (range of 0-180mm) at Nyngan (Figure 8)...
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Catalogue: GRDC Publications
Tools are now available to better define soils in terms of their productive capacity and for the routine seasonal monitoring of the water resource as it is captured and utilised by crops (or weeds if allowed)... Underpinning the push to improve water use efficiency is the need for farmers and their advisors to have a good understanding of how soils work in relation to water capture and storage and why some soils have the ability to hold more water for crop use than others... Rooting depth should be 101..
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