Irrigation scheduling research: South African experiences and future prospects

Water SA

Volumn 37, Issue 5, 2011, Pages 751-764

  Annandale, J G ^a   Stirzaker, R J ^a,b   Singels, A ^a,c   van der Laan, M ^a,c   Laker, M C ^a  

^a UNIVERSITY OF PRETORIA   (South Africa)

^b CSIRO   (Australia)

^c SOUTH AFRICAN SUGARCANE RESEARCH INSTITUTE   (South Africa)

Author keywords

BEWAB; CANESIM; PUTU; SWB; Wetting front detector

Indexed keywords

AGRICULTURE; CROPS; IRRIGATION; REMOTE SENSING; SOIL MOISTURE; SOIL SURVEYS; SOILS; WETTING;

BEWAB; CANESIM; ENVIRONMENTAL CONDITIONS; IRRIGATION SCHEDULING; PUTU; SOIL WATER MEASUREMENTS; WATER RESEARCH COMMISSIONS; WETTING FRONT DETECTORS;

SCHEDULING;

AGRICULTURAL WORKER; BIOPHYSICS; CONCEPTUAL FRAMEWORK; ELECTRICITY GENERATION; EMPIRICAL ANALYSIS; ENVIRONMENTAL CONDITIONS; ENVIRONMENTAL MONITORING; IRRIGATION; MEASUREMENT METHOD; NITROGEN; NUMERICAL MODEL; REMOTE SENSING; RESEARCH WORK; SOIL TYPE; THERMODYNAMICS; WATER CONTENT; WATER MANAGEMENT;

SOUTH AFRICA;

EID: 83755195854     PISSN: 03784738     EISSN: 18167950     Source Type: Journal    
DOI: 10.4314/wsa.v37i5.12     Document Type: Article

References (133)

1. ALLEN RG, PEREIRA LS, RAES D and SMITH M (1998) Crop evapotranspiration. FAO Irrigation and Drainage Paper 56. Food and Agriculture Organization (FAO), Rome, Italy. 300 pp.
2. ANNANDALE JG, BELETSE YG, DE JAGER PC, JOVANOVIC NZ, STEYN JM, BENADÉ N, LORENTZ SA, HODGSON FDI, USHER B, VERMEULEN D and AKEN ME (2007) Predicting the Environmental Impact and Sustainability of Irrigation with Coal Mine Water. WRC Report No. 1149/1/07, Water Research Commission, Pretoria, South Africa.175 pp.
3. ANNANDALE JG, BENADÉ N, JOVANOVIC NZ, STEYN JM and DU SAUTOY (1999a) Facilitating Irrigation Scheduling by Means of the Soil Water Balance Model. WRC Report No. 753/1/99, Water Research Commission, Pretoria, South Africa. 285 pp.
4. ANNANDALE JG, JOVANOVIC NZ, BENADÉ N and TANNER PD (1999b) Modelling the long-term effect of irrigation with gypsiferous water on soil and water resources. Agric. Ecosyst. Environ. 76 109-119.
5. ANNANDALE JG, CAMPBELL GS, OLIVIER FC and JOVANOVIC NZ (2000) Predicting crop water uptake under full and deficit irrigation. An example using pea (Pisum sativum cv. Puget). Irrig. Sci. 19 65-72.
6. ANNANDALE JG, JOVANOVIC NZ, MPANDELI NS and LOBIT P (2002a) Two Dimensional Energy Interception and Water Balance Model for Hedgerow Tree Crops. WRC Report No. 945/1/02 Water Research Commission, Pretoria, South Africa. 217 pp.
7. ANNANDALE JG, JOVANOVIC NZ, TANNER PD, BENADÉ N, DU PLESSIS HM (2002b) Sustainability of irrigation with gypsiferous mine water. Mine Water Environ. 21 81-90.
8. ANNANDALE JG, JOVANOVIC NZ, PRETORIUS JJB, LORENTZ SA, RETHMAN NFG and TANNER PD (2001) Gypsiferous mine water use in irrigation on rehabilitated open cast mine land: crop production, soil water and salt balance. Ecol. Eng. 17 153-164.
9. ANNANDALE JG and STOCKLE CO (1994) Fluctuation of crop evapotranspiration coefficients with weather: a sensitivity analysis. Irrig. Sci. 15 1-7.
10. ANNANDALE JG, STEYN JM, BENADÉ N, JOVANOVIC NZ and SOUNDY P (2005) Technology Transfer of the Soil Water Balance (SWB) Model as a User-Friendly Irrigation Scheduling Tool. WRC Report No. TT 251/05, Water Research Commission, Pretoria, South Africa. 80 pp.
11. ANNANDALE JG, VAN DER WESTHUIZEN AJ and OLIVIER FC (1996) Die Fasilitering van Tegnologie Oordrag deur Verbeterde Besproeiingsriglyne vir Groente en 'n Meganistiese Gewasmodeleringbenadering (Facilitating Technology Transfer Through Improved Irrigation Guidelines of Vegetables and a Mechanistic Crop Modelling Approach). WRC Report No. 476/1/96, Water Research Commission, Pretoria, South Africa. 179 pp.
12. ARC-ISCW (2005) Overview of the Agricultural Natural Resources of South Africa. ARC-ISCW Report No. GW/A/2004/13. (CD-ROM) ARC-Institute for Soil, Climate and Water, Pretoria, South Africa. 129 pp.
13. BASTIAANSSEN WGM, MOLDEN DJ and MAKIN IW (2000) Remote sensing for irrigated agriculture: examples from research and possible applications. Agric. Water Manage. 46 137-155.
14. BEMBRIDGE TJ (2000) Guidelines for Rehabilitation of Small-Scale Farmer Irrigation Schemes in South Africa. WRC Report No. 891/1/00, Water Research Commission, Pretoria, South Africa. 199 pp.
15. BENADÉ N, ANNANDALE JG, JOVANOVIC NZ, MEIRING JA and CROUS CR (2002) The Development of An Integrated Information System for Irrigation Water Management using the WAS SWB and RiskMan Computer Models. WRC Report No. 946/4/02, Water Research Commission, Pretoria, South Africa. 282 pp.
16. BENNIE ATP (1995) Sound water management concepts and their application at farm level. Proc. Southern African Irrigation Symposium. 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95 Water Research Commission, Pretoria, South Africa. pp. 287-294.
17. BENNIE ATP, COETZEE MJ, VAN ANTWERPEN R, VAN RENSBURG LD and BURGER RD (1988) Water Balance Model for Irrigation Based on Soil Profile Water Supply Rate. WRC Report No. 144/1/88. Water Research Commission, Pretoria, South Africa. 405 pp.
18. BENNIE ATP, STRYDOM MG and VERY HS (1998) Use of Computer Models for Agricultural Water Management on Ecotope Level. WRC Report No. TT 102/98. Water Research Commission, Pretoria, South Africa. 250 pp.
19. BENNIE ATP, VAN RENSBURG LD, STRYDOM MG and DU PREEZ CC (1997) Reaksie van Gewasse op Voorafgeprogrammeerde Tekortbesproeiing (Reaction of Crops to Pre-Programmed Deficit Irrigation). WRC Report No. 423/1/97. Water Research Commission, Pretoria, South Africa. 225 pp.
20. BENNIE ATP and HENSLEY M (2001) Maximizing precipitation in dryland agriculture in South Africa-a review. J. Hydrol. 241 124-139.
21. BEUKES O, VOLSCHENK T, DE VILLIERS JF and KARSTEN JHM (2003) Deficit Irrigation Studies to Improve Irrigation Scheduling in Deciduous Fruit Orchards. WRC Report No. 892/2/03. Water Research Commission, Pretoria, South Africa. 100 pp.
22. BOEDT LJJ and LAKER MC (1985) The Development of Profile Available Water Capacity Models. WRC Report No. 98/1/85. Water Research Commission, Pretoria, South Africa. 448 pp.
23. BOTHA CAJ, STEYN GJ and STEVENS JB (2000) Factors which Influence the Acceptability of Irrigation Scheduling with Specific Reference to Scheduling Models. WRC Report No. 893/1/00. Water Research Commission, Pretoria, South Africa. 199 pp.
24. BOTHA FJP, BENNIE ATP and BURGER RduT (1983) Water Use Efficiency of Irrigated Crops as Influenced by Varying Cultivation Practices and Root Configurations. Department of Soil Science, UOFS, Bloemfontein. 391 pp.
25. BUCHHEIM JF and PLOSS LF (1977) Computerized irrigation scheduling using neutron probes. Proc. 1977 Annual Conference of the American Society of Agricultural Engineers. ASAE, St. Joseph, Michigan, US.
26. BURGERS MS and KIRK RD (1993) Practical Scheduling of Irrigation in the Northern Transvaal. WRC Report No. 152/1/93. Water Research Commission, Pretoria, South Africa. 161 pp.
27. CAR N, CHRISTEN E, HORNBUCKLE J and MOORE G (2010) ET-based irrigation DSS using mobile phones where remote sensing is not applicable. Proc. Irrigation Australia Ltd Conference, 8-10 June 2010, Sydney, Australia,.
28. nd edition). National Program for Irrigation Research and Development, CSIRO Publishing, Melbourne, Australia.
29. COSTA JM, ORTUNO MF and CHAVES MM (2007) Deficit irrigation as a strategy to save water: Physiology and potential application to horticulture. J. Integrated Plant Biol. 49 1421-1434.
30. CROSBY C (2004) The GWK limited irrigation scheduling service. The Water Wheel May/June 2004. 14-17.
31. CROSBY CT and CROSBY CP (1999) SAPWAT: A Computer Program for Establishing Irrigation Requirements and Scheduling Strategies in South Africa. WRC Report No. 624/1/99. Water Research Commission, Pretoria, South Africa. 12 pp.
32. CROSBY CT, DE LANGE M, STIMIE CM, VAN DER STOEP I (2000) A Review of Planning and Design Procedures Applicable to Small-Scale Farmer Irrigation Projects. WRC Report No. 578/2/00. Water Research Commission, Pretoria, South Africa. 245 pp.
33. DE JAGER JM and KENNEDY JA (1996) Weather-Based Irrigation Scheduling for Various Farms (Commercial and Small-Scale). Water Reports 8: 33-38. Food and Agriculture Organization (FAO), Rome, Italy.
34. th International Congress on Irrigation and Drainage. Cairo, Egypt. 153-166.
35. DE JAGER JM, MOTTRAM R and KENNEDY JA (2001) Research on a computerised weather based irrigation water management system. WRC Report No. 581/1/01. Water Research Commission, Pretoria, South Africa. 180 pp.
36. DE JAGER JM and VAN ZYL WH (1989) Atmospheric evaporative demand and evaporation coefficient. Water SA 15 103-110.
37. DE JAGER JM and SINGELS A (1994) Research report by the Irrigation Planning Unit to the Department of Agriculture, Pretoria, South Africa. 6 pp.
38. DE JAGER JM, VAN ZYL WH, KELBE BE and SINGELS A (1987) Research on a weather service for scheduling the irrigation of winter wheat in the OFS. WRC Report No. 117/1/87. Water Research Commission, Pretoria, South Africa. 281 pp.
39. DENMEAD OT and SHAW RH (1962) Availability of soil water to plants as affected by soil moisture content and meteorological conditions. Agron. J. 54 385-90.
40. DOORENBOS J and PRUITT WO (1977) Guidelines for predicting crop water requirements. FAO Irrigation and Drainage Paper 33 Food and Agriculture Organization (FAO), Rome, Italy. 193 pp.
41. st edn.). September 2004. Department of Water Affairs and Forestry, Pretoria, South Africa. 150 pp.
42. ENGLISH MJ and NAKAMURA BC (1982) Deficit irrigation: Effects of irrigation frequency on crop yield. Proc. Technical Conf. on Water, Energy and Economic Alternatives. The Irrigation Association, Falls Church, Virginia, US. 162-172.
43. FANADZO M, CHIDUZA C, MNKENI PNS, STOEP I and STEVENS J (2010) Crop production management practices as a cause for low water productivity at Zanyokwe Irrigation Scheme. Water SA 36 27-36.
44. FAO (2005) South Africa: Water and Food Security Country Profiles. URL: http://www.fao.org/nr/water/aquastat/countries/ south_africa/south_africa_cp.pdf
45. FESSEHAZION, MK, STIRZAKER RJ, ANNANDALE JG, and EVERSON CS (2011) Improving nitrogen and irrigation water use efficiency through adaptive management: A case study using annual ryegrass. Agric. Ecosyst. Environ. 141 350-358.
46. FISCHER HH (1995) Scheduling of deficit irrigation for improved water use efficiency. Proc. Southern African Irrigation Symposium, 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95 Water Research Commission, Pretoria, South Africa. pp. 344-349.
47. FISCHER HH and NEL PC (1990) Drupbespoeiing by Tamaties (Drip Irrigation in Tomatoes). WRC Report No. 185/1/90. Water Research Commission, Pretoria, South Africa. 181 pp.
48. GARDNER WR (1960) Dynamic aspects of water availability to plants. Soil Sci. 89 63-73.
49. GARDNER W and KIRKHAM D (1952) Determination of soil moisture by neutron scattering. Soil Sci. 73 391.
50. GODFRAY HC, BEDDINGTON JR, CRUTE IR, HADDAD L, LAWRENCE D, MUIR JF, PRETTY J, ROBINSON S, THOMAS SM and TOULMIN C (2010) Food security: the challenge of feeding 9 million people. Science 327 812-818.
51. GRANT S (2000) Five-step irrigation schedule: Promoting fruit quality and vine health. Winegrowing May/June 2000, 1-4.
52. GREEN GC (1985) Estimated Irrigation Requirements of Crops in South Africa, Part 1. Memoirs on the Agricultural Resources of South Africa, No. 2. Department of Agriculture and Water Supply. Pretoria, South Africa.
53. HAARHOFF D (2011) Personal communication via e-mail on 21 October 2011. Manager: Research and Development, Griekwaland-Wes Koöperasie, Douglas, South Africa.
54. HENSLEY M and DE JAGER JM (1982) The Determination of the Profile Available Water Capacities of Soils. Department of Soil Science, University of Fort Hare, Alice, South Africa. 282 pp.
55. IDSO SB, JACKSON RD, PINTER PJ, REGINATO RJ and HATFIELD JL (1981) Normalizing the stress-degree-day parameter for environmental variability. Agric. Meteorol. 24 45-55.
56. JACKSON RD, IDSO SB, REGINATO RJ and PINTER PJ (1981) Canopy temperature as a crop water stress indicator. Water Resour. Res. 17 1133-1138.
57. JOVANOVIC NZ and ANNANDALE JG (1999) An FAO crop factor modification to SWB makes inclusion of crops with limited data possible: Examples for vegetable crops. Water SA 25 181-190.
58. JOVANOVIC NZ, ANNANDALE JG and MHLAULI NC (1999) Field water balance and SWB parameter determination of six winter vegetable species. Water SA 25 191-196.
59. JOVANOVIC NZ and ANNANDALE JG (2000a) Crop growth model parameters of 19 summer vegetable cultivars for use in mechanistic irrigation scheduling models. Water SA 26 67-76.
60. JOVANOVIC NZ and ANNANDALE JG (2000b) SWB (Soil Water Balance): A computer tool for teaching future irrigation managers. J. Nat. Resour. Life Sci. Educ. 29 15-22.
61. JOVANOVIC NZ, ANNANDALE JG, CLAASSENS AS, LORENTZ SA, TANNER PD, AKEN ME and HODGSON FDI (2002) Commercial production of crops irrigated with gypsiferous mine water. Water SA 28 413-421.
62. JOVANOVIC NZ, ANNANDALE JG and HAMMES PS (2000a) Teaching crop physiology with the soil water balance (SWB) model. J. Nat. Resour. Life Sci. Educ. 29 23-30.
63. JOVANOVIC NZ, ANNANDALE JG and NEL AA (2000b) Calibration and validation of the SWB model for sunflower (Helianthus annuus L.). S. Afr. J. Plant Soil 17 117-123.
64. JUMMAN A (2009) A Framework to Improve Irrigation Design and Operating Strategies in the South African Sugarcane Industry. M. Sc. (Eng) Dissertation, University of KwaZulu-Natal, Pietermaritzburg, South Africa. 15 pp.
65. LAKER MC (1982) Appendix 8.1 A provisional simple model for predicting PAWC for certain Ciskeian soils. In: Hensley M and De Jager JM (ed.) The Determination of the Profile Available Water Capacities of Soils. Department of Soil Science, University of Fort Hare, Alice, South Africa. pp. 235-254
66. LAKER MC (1985) The utilization of heavier soils for irrigation and using the water storage capacities of soils to reduce design peaks. Proc. SABI Conf., Christiana, 14-17 March 1985, Christiana, South Africa. Available from mlaker@telkomsa. net.
67. LAKER MC, BOEDT LJJ and HENSLEY M (1987) Pre-dawn leaf water potential as indicator of plant water stress-with special reference to problems encountered under conditions of high evaporative demand. Proc. Int. Conf. on Measurement of Soil and Plant Water Status Vol. 2, 6-10 July 1987, Utah State Univ., Logan, US. pp. 25-29.
68. LAKER MS (2004) The Effect of Atmospheric and Soil Conditions on the Grapevine Water Status. M. Sc. Agric. dissertation. University of Stellenbosch, Stellenbosch. 107 pp.
69. LATEGAN E and HOWELL CL (2010) The partial rootzone drying (PRD) of merlot in the Breede River Valley (Part 1): Irrigation volumes, plant water stress and vigour. Wynboer Technol. Yearbook 2010, pp. 19-21.
70. LEIB BG, HATTENDORF M, ELLIOT T and MATTHEWS G (2002) Adoption and adaption of scientific irrigation scheduling: trends from Washington, USA as of 1998. Agric. Water Manage. 55 105-120.
71. MARAIS D, RETHMAN NFG and ANNANDALE JG (2002) Water Use and Water Use Efficiency of Fodder Crops under Irrigation: Part 1-Annual Subtropical Crops. WRC Report No. 573/1/02. Water Research Commission, Pretoria, South Africa. 76 pp.
72. MEYER WS, OOSTERHUIS DM, BERLINER PR, GREEN GC and VAN DER MERWE AJ (1987) Evapotranspiration and Water Use Studies in Wheat and Soybeans with the Help of the Weighing Lysimeter Technique. WRC Report No. H2/1/87. Water Research Commission, Pretoria, South Africa. 4 pp.
73. MILLER DE (1977) Deficit high frequency irrigation of sugarbeet, wheat and beans. Proc. Speciality Conf. on Water, Irrigation and Management for Drainage. ASCE, New York.
74. MKHIZE SS, VANASSCHE FMG and LAKER MC (1996) The Response of Citrus Seedlings to Soil Compaction and Variations in Soil Water Potential in the Upper Range of Plant Available Water. WRC Report No. 261/1/96. Water Research Commission, Pretoria, South Africa. 250 pp.
75. MONTEITH JL (1977) Climate and efficiency of crop production in Britain. Philos. Trans. R. Soc. London, Ser. B 281 277-294.
76. MOTTRAM R and DE JAGER JM (1994) Research on maximising irrigation project efficiency in different soil-climate-irrigation situations. WRC Report No. 226/1/94. Water Research Commission, Pretoria, South Africa.197 pp.
77. MYBURGH PA (2011a) Response of Vitis vinifera L. cv. Merlot to low frequency drip irrigation and partial root zone drying in the Western Cape coastal region. S. Afr. J. Enol. Vitic. 32 89-103.
78. MYBURGH PA (2011b) Personal communication via e-mail on 20 October 2011. Soil scientist, ARC-Infruitec/Nietvoorbij, Stellenbosch.
79. NEL AA (1995a) Irrigation timing using leaf water potential of wheat. Proc. Southern African Irrigation Symposium. 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95. Water Research Commission, Pretoria, South Africa. pp. 336-340.
80. NEL FJ (1995b) Irrigation management on large farms, with special reference to the use of a neutron hydroprobe. Proc. Southern African Irrigation Symposium, 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95. Water Research Commission, Pretoria, South Africa. 305-307.
81. NIEUWOUDT WL, BACKEBERG GR and DU PLESSIS HM (2004) The value of water in the South African economy: Some implications. Agrekon 43 162-182.
82. OLIVIER FC, LECLER NL and SINGELS A (2009) Increasing Water Use Efficiency of Irrigated Sugarcane by Means of Specific Agronomic Practices. WRC Report No. 1577/1/09. Water Research Commission, Pretoria, South Africa. 127 pp.
83. PANNELL DJ, MARSHAL GR, BARR N, CURTIS A, VANCLAY F and WILKINSON R (2006) Understanding and promoting adoption of conservation practices by rural landholders. Aust. J. Exp. Agric. 46 1407-1424.
84. PASSIOURA JB (1988) Water transport in and to roots. Ann. Rev. Plant Phys. 39 245-265.
85. PAVEL EW and DE VILLIERS AJ (2004) Responses of mango trees to reduced irrigation regimes. Acta Hortic. 646 63-68.
86. PAVEL EW, VANASSCHE FMG and GROSSMAN YL (2003) Optimisation of Irrigation Management in Mango Trees by Determination of Water and Carbon Demands to Improve Water Use Efficiency and Fruit Quality. WRC Report No. 1136/1/03. Water Research Commission, Pretoria, South Africa. 87 pp.
87. POSTHUMUS C (2011) The intelligent pixel-helping the farmer. SABI Magazine April/May 2011, pp 10-11.
88. RATLIFF LF, RITCHIE JT and CASSEL DK (1983) Field measured limits of soil water availability as related to laboratory-measured properties. Soil Sci. Soc. Am. J. 47 770-775.
89. REGINATO RJ (1995) Crop water stress assessment for irrigation management. Proc. Southern African Irrigation Symposium. 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95. Water Research Commission, Pretoria, South Africa. pp. 284-286.
90. REINDERS FB, VAN DER STOEP I, LECLER NL, GREAVES KR, VAHRMEIJER JT, BENADÉ N, DU PLESSIS FJ, VAN HEERDEN PS, STEYN JM, GROVÉ B, JUMMAN A and ASCOUGH G (2010) Standards and Guidelines for Improved Efficiency of Irrigation Water Use from Dam Wall Release to Root Zone Application: Guidelines. WRC Report No. TT 466/10. Water Research Commission, Pretoria, South Africa. 234 pp.
91. RICHARDS LA and NEAL OR (1936) Some field observations with tensiometers. Soil Sci. Soc. Am. Proc. 1 71.
92. ROBBINS CH (1991) Solute transport and reactions in salt-affected soils. In: Hanks RJ and Ritchie JT (eds.) Modelling Plant and Soil Systems. Agron. Mono. No. 31. ASA-CSSA-SSSA, Madison, WI. 365-395.
93. SANTOS C, LORITE IJ, TASUMI M, ALLEN RG and FERERES E (2008) Integrating satellite-based evapotranspiration with simulation models for irrigation management at the scheme level. Irrig. Sci. 26 277-288.
94. SAVAGE MJ and WIEBE HH (1987) Effect of conductance on water vapor pressure determination of leaf water potential. Proc. Int. Conf. on Measurement of Soil and Plant Water Status Vol. 2. 6-10 July 1987, Utah State Univ., Logan, US. 55-61.
95. SAVAGE MJ, GRAHAM and LIGHTBODY KE (2000) An Investigation of the Stem Steady State Heat Energy Balance Technique in Determining Water Use by Trees. WRC Report No. 348/1/00. Water Research Commission, Pretoria, South Africa. 181 pp.
96. SINGELS A (2007) A new approach to implementing computer-based decision support for sugarcane farmers and extension staff. The case of My Canesim. Proc. Int. Soc. Sugar Cane Technol. 26 211-219 (also published in Sugar Cane Int. 26 22-25).
97. SINGELS A and SMITH MT (2006) Provision of irrigation scheduling advice to small-scale sugarcane farmers using a web based crop model and cellular technology: A South African case study. Irrig. Drain. 55 363-372.
98. SINGELS A and SMITH MT (2009) Real Time Irrigation Advice for Small-Scale Sugarcane Production Using A Crop Model. WRC Report No. K5/1576/4. Water Research Commission, Pretoria, South Africa. 147 pp.
99. SMITH M, ALLEN RG and PEREIRA LS (1996) Revised FAO methodology for crop water requirements. Proc. of the Int. Conf. on Evapotranspiration and Irrigation Scheduling, San Antonio, Texas, USA. 133-140.
100. SPREER W, NAGLE M, NEIDHART S, CARLE R, ONGPRASERT S and MÜLLER J (2007) Effect of regulated deficit irrigation and partial rootzone drying on the quality of mango fruits (Mangifera indica L., cv. 'Chock Anan'). Agric. Water Manage. 88 173-180.
101. STEVENS JB, DUVEL GH, STEYN GJ and MAROBANE W (2005) The Range, Distribution and Implementation of Irrigation Scheduling Models and Methods in South Africa. WRC Report No. 1137/1/05. Water Research Commission, Pretoria, South Africa. 208 pp.
102. STEVENS JB and STIRZAKER RJ (2010) Wetting Front Detector Transfer of Technology. WRC Report No. K8/599/4. Water Research Commission, Pretoria, South Africa. 30 pp.
103. STEYNBERG RE, NEL PC and RETHMAN NFG (1994) Waterverbruik en Waterverbruiksdoeltreffendheid van Gematigde Aanplante Weidings onder Bespoeiing (Water Use and Water Use Efficiency of Temperate Planted Pastures under Irrigation). WRC Report No. 257/1/94. Water Research Commission, Pretoria, South Africa.
104. STIRZAKER RJ (1999) The problem of irrigated horticulture: matching the biophysical efficiency with the economic efficiency. Agrofor. Syst. 45 187-202.
105. STIRZAKER RJ (2003) When to turn the water off: scheduling microirrigation with a wetting front detector. Irrig. Sci. 22 177-185.
106. STIRZAKER RJ (2006) Soil Water Monitoring. State of Play and Barriers to Adoption, Irrigation Matters Series 01/06. CRC for Irrigation Futures. Darling Heights, Qld. URL: www.irrigationfutures. org.au/news.asp?catID=12&ID=440
107. th International Symposium on Irrigation of Horticultural Crops. Acta Hort. 792 647-654.
108. STIRZAKER RJ (2011) Strategy, tactics and heuristics for managing solutes in horticultural crops. Acta Hort. 889 59-65.
109. STIRZAKER RJ and HUTCHINSON PA (2005) Irrigation controlled by a wetting front detector: field evaluation under sprinkler irrigation. Aust. J. Soil Res. 43 935-943.
110. STIRZAKER R, STEVENS J, ANNANDALE J, MAEKO T, STEYN J, MPANDELI S, MAUROBANE W, NKGAPELE J and JOVANOVIC N (2004) Building Capacity in Irrigation Management with Wetting Front Detectors. WRC Report No. TT 230/04. Water Research Commission, Pretoria, South Africa. 85 pp.
111. STIRZAKER RJ, STEVENS JB, ANNANDALE JG and STEYN JM (2010a) Stages in the adoption of a wetting front detector. Irrig. Drain. 59 367-376
112. STIRZAKER RJ, STEYN JM, ANNANDALE JG, ADHANOM G, VAN DER LAAN M and M'MARETE C (2010b) Adapting the Wetting Front Detector to Small-Scale Furrow Irrigators and Providing a Basis for the Interpretation of Salt and Nutrient Measurements from the Water Sample. WRC Report No. 1574/1/10. Water Research Commission, Pretoria, South Africa. 99 pp.
113. STREUTKER A (1978) Tensiometer controlled medium frequency topsoil irrigation: a technique to improve agricultural water management. Water SA 4 134-155.
114. STREUTKER A, MOLENAAR HW, HAMMAN H, NEL CC and MULDER JH (1981) Besproeiing, Gewasopbrengs en Dreinering op die Vaalhartsbesproeiingskema: 2. Die Voorkoms van Verbrakte Grond en die Invloed van Dreinering Daarop (Irrigation, Crop Yield and Drainage at the Vaalharts Irrigation Scheme: 2. The Occurrence of Salt-Affected Soils and the Effect of Drainage on It). Water SA 7 175-184.
115. STRYDOM MG (1998) Kwantifisering van Insetparameters vir die Besproeiingskeduleringsprogram BEWAB vir Aartappels en Erte. M. Sc. (Agric) Dissertation, University of the Free State, Bloemfontein, South Africa. 207 pp.
116. TANNER CB and SINCLAIR TR (1983) Efficient water use in crop production: research or re-search? In: Taylor HM, Jordan WR and Sinclair TR (eds.) Limitations to Efficient Water Use in Crop Production. American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Madison, Wisconsin. pp 1-27.
117. TESFAMARIAM EH (2004) Modelling the Soil Water Balance of Canola Brassica napus L (Hyola 60). M. Sc. (Agric) Dissertation. University of Pretoria, South Africa. 120 pp.
118. TESFAMARIAM EH (2009) Sustainable Use of Sewage Sludge as a Source of Nitrogen and Phosphorus in Cropping Systems. Ph.D. Dissertation, University of Pretoria, South Africa. 270 pp.
119. VANASSCHE FMG and LAKER MC (1989) Research on Improving Irrigation Management Based on Soil Water Monitoring and Detailed Knowledge of Profile Available Water Capacities. WRC Report No. 166/1/89. Water Research Commission, Pretoria, South Africa. 347 pp.
120. VAN AVERBEKE W and NETSHITHUTHUNI C (2010) Effect of irrigation scheduling on leaf yield of non-heading Chinese cabbage (Brassica rapa L. subsp. chinensis). S. Afr. J. Plant Soil 27 322-326.
121. VANCLAY F (2003) Social principles to inform agriculture. In: Wilson BP and Curtis A (eds.) Agriculture for the Australian Environment. Proc. 2002 Australian Academy of Science Fenner Conference on the Environment. Charles Sturt University, Australia. 9-24.
122. VAN DER LAAN M (2009) Development, Testing and Application of a Crop Nitrogen and Phosphorus Model to Investigate Leaching Losses at the Local Scale. Ph.D. Dissertation, University of Pretoria, South Africa. 178 pp.
123. VAN DER LAAN M, STIRZAKER RJ, ANNANDALE JG, BRISTOW KL and DU PREEZ CC (2010) Monitoring and modelling draining and resident soil water nitrate concentrations to estimate leaching losses. Agric. Water Manage. 97 1779-1786.
124. VAN VUUREN L (2011) Improved water use only a satellite away. The Water Wheel, September/October 2011. 14-17.
125. VAN ZYL WH and DE JAGER JM (1992) Effect of climate on plant evaporation coefficients for the potato crop. Agric. For. Meteorol. 60 167-179.
126. VAN ZYL WH and DE JAGER JM (1994) Research on the Climatic Dependence of Evaporation Coefficients. WRC Report No. 260/1/94. Water Research Commission, Pretoria, South Africa. 166 pp.
127. VAN ZYL WH, DE JAGER JM and MAREE CJ (1989) The relationship between daylight evaporation from short vegetation and the USWB Class A pan. Agric. For. Meteorol. 46 107-118.
128. VAN ZYL WH, DE JAGER JM, MAREE CJ and SINGELS A (1990) Canopy surface conductance of unstressed wheat and its weather dependence. Water SA 16 99-104.
129. VAN ZYL WH and DE JAGER JM (1987) Accuracy of the Penman-Monteith equation adjusted for atmospheric stability. Agric. For. Meteorol. 41 57-64.
130. VAN ZYL WH and DE JAGER JM (1992) Effect of climate on plant evaporation coefficients for the potato crop. Agric. For. Meteorol. 60 167-179.
131. VOLSCHENK T, DE VILLIERS JF and BEUKES O (2003) The Selection and Calibration of a Model for Irrigation Scheduling of Deciduous Fruit Orchards. WRC Report No. 892/1/03. Water Research Commission, Pretoria, South Africa. 126 pp.
132. WALKER S (2000) Irrigation Requirements of Selected Crops under Small-Scale Production: Linking On-Farm and On-Station Research. WRC Report No. 689/1/00. Water Research Commission, Pretoria, South Africa. 146 pp.
133. WATER RESEARCH COMMISSION (1995) Proceedings of the Southern African Irrigation Symposium, 4-6 June 1991, Durban, South Africa. WRC Report No. TT 71/95. Water Research Commission, Pretoria, South Africa. 435 pp.