Browsing Research Articles (Plant Production and Soil Science) by UP Author "Stirzaker, Richard John"
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Browsing Research Articles (Plant Production and Soil Science) by UP Author "Stirzaker, Richard John"
Now showing items 1-8 of 8
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Adhanom, G.T.; Stirzaker, Richard John; Lorentz, Simon A.; Annandale, John George; Steyn, Joachim Marthinus (Water Research Council, 2012-01)The design of passive lysimeters or wetting front detectors determines the tensions at which they collect a water sample from an unsaturated soil. When deployed in the field to help manage irrigation, it is necessary to ...
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Fessehazion, Melake Kessete; Stirzaker, Richard John; Annandale, John George; Everson, Colin Stuart (Elsevier, 2011-03)Nitrogen is often poorly managed in irrigated agro-ecosystems. Accumulation and leaching of N can occur due to excessive fertiliser N, high soil inorganic N carryover between seasons, rapid mineralisation in spring and ...
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Van der Laan, Michael; Stirzaker, Richard John; Annandale, John George; Bristow, K.L. (Keith); Du Preez, C.C. (South African Society of Crop Production/ Soil Science Society of South Africa/ Southern African Weed Science Society/ Southern African Society for Horticultural Sciences, 2011)Electrical conductivity (EC) measurements are often used to identify and address soil salinity issues in irrigated cropping systems. In this study, measurements of soil solution EC (EC-sol) collected in ceramic suction ...
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Annandale, John George; Stirzaker, Richard John; Singels, Abraham; Van der Laan, Michael; Laker, Michiel Christiaan (Water Research Council, 2011-12)Many scheduling approaches have been developed with Water Research Commission funding over the past 4 decades and deployed with varying levels of success; 2 approaches have won prestigious international awards. Soil-based ...
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Van der Laan, Michael; Annandale, John George; Bristow, K.L. (Keith); Stirzaker, Richard John; Du Preez, C.C.; Thorburn, P.J. (Elsevier, 2014-02)The complexities and challenges in quantifying N leaching have led to development of a range of measurement and modelling techniques, but none are widely applied. Observations that N moves more slowly than water through ...
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Tesfamariam, Eyob Habte; Annandale, John George; Steyn, Joachim Marthinus; Stirzaker, Richard John; Mbakwe, Ikenna (Water Research Council, 2013-07)Land application of sludge has been shown to improve soil properties and aid crop growth, but the possibility of constituent nutrients such as nitrogen and phosphorus reaching environmentally toxic levels has caused governing ...
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Fessehazion, Melake Kessete; Annandale, John George; Everson, Colin Stuart; Stirzaker, Richard John; Van der Laan, Michael; Truter, Wayne Frederick; Abraha, Amanuel Bokhre (Taylor & Francis, 2014)Poor irrigation management in pastures can lead to yield and quality reduction as well as loss of income through extra pumping and leaching of nitrate fertiliser. A number of irrigation scheduling techniques of varying ...
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Tesfamariam, Eyob Habte; Annandale, John George; Steyn, J.M. (Joachim Marthinus), 1963-; Stirzaker, Richard John; Mbakwe, Ikenna (Elsevier, 2015-04)Process-based computer simulation models are often used as reasoning support tools to integrate the complex processes involved in the soil-plant-atmosphere system. The objectives of this study were to evaluate the ...
Now showing items 1-8 of 8