Peter W. G. Sale

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Hydraulic lift can be a desirable characteristic for cotton growing in areas that experience frequent drying of the topsoil. This study employed specialized soil columns to test if cotton can hydraulically lift water and whether this hydraulically lifted water can facilitate P acquisition from the dry topsoil of a clay and a sandy soil. The role of subsoil(More)
Because various phosphate (P) fertilizers differ widely in their solubility, it is commonly observed that crop response to P fertilizers varies under the same soil and crop conditions. Furthermore, a major problem encountered in the methods for determining the relative effectiveness (RE) of water-insoluble P fertilizer (e.g., phosphate rock) with respect to(More)
Previous studies revealed that cotton plants grown on soils with low available-P were accessing significant non-fertilizer P sources. This suggests that cotton can access stable-P pools from soil. This study examined cotton’s ability to utilize sparingly soluble P sources in comparison with wheat and white lupin. Plants were grown for 45 days in a Vertosol(More)
Subsurface acidity is a major factor limiting crop yield in some agricultural soils. The surface application of lime has limited effect on the subsurface acidity due to the slow downward movement, while deep incorporation of lime is costly. This paper tested the concept of biologically ameliorating subsurface acidity in a highly acidic soil through the net(More)
Understanding the mechanism of how phosphorus (P) regulates the response of legumes to elevated CO2 (eCO2) is important for developing P management strategies to cope with increasing atmospheric CO2 concentration. This study aimed to explore this mechanism by investigating interactive effects of CO2 and P supply on root morphology, nodulation and soil P(More)
The soil pH in the vicinity of the roots can be changed by an imbalance in supply of predominant anions or cations. A soil column experiment examined the effects of localised supply of nitrate and P on plant growth and pH change in a Podosol (pH 3.76 in 0.01 M CaCl2 and pH buffering capacity 0.81 cmol kg−1 pH−1). Nitrate [(Ca(NO3)2] and P [(NaH2PO4)](More)
A reduction in K supply to soybean plants to deficiency levels during both vegetative and reproductive development resulted in reductions not only in yield, but also in oil and K concentrations in the seed and a concomittant increase in seed protein concentration. Correlations between mean fruit yield and oil, protein and K concentrations, over a wide range(More)
The efficient management of phosphorus (P) in cropping systems remains a challenge due to climate change. We tested how plant species access P pools in soils of varying P status (Olsen-P 3.2–17.6 mg kg−1), under elevated atmosphere CO2 (eCO2). Chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) plants were grown in rhizo-boxes containing Vertosol(More)
Maintaining nutrient supply, including phosphorus (P), is critical to ensure the adaptation of cropping systems to future elevated CO2 (eCO2) environments. There is much speculation about the role of sparingly soluble sources to supply plants with P so we tested the hypothesis that eCO2 increases plant’s ability to utilise P from sparingly soluble sources(More)
A glasshouse experiment was conducted to examine the comparative growth and P uptake response following P fertilizer application in lupins (Lupinus angustifolius L. cv. Chittick) and chickpeas (Cicer arietinum cv. Tyson) compared to wheat (Triticum aestivum cv. Sunstar). Measurements of dry matter, phosphorus uptake and nodule numbers were made at 50 and(More)