IS DUAL CROPPING UNDER CENTRE PIVOTS A JUSTIFIABLE IRRIGATION PRACTICE? Leon Van Rensburg, JH Barnard, JB Sparrow, ATP Bennie and CC Du Preez Department.

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Presentation transcript:

IS DUAL CROPPING UNDER CENTRE PIVOTS A JUSTIFIABLE IRRIGATION PRACTICE? Leon Van Rensburg, JH Barnard, JB Sparrow, ATP Bennie and CC Du Preez Department of Soil, Crop and Climate Sciences

BACKGROUND WRC (Report No K5/1647, 2012): MANAGING SALINITY ASSOCIATED WITH IRRIGATION AT ORANGE-RIET AND VAALHARTS IRRIGATION SCHEMES * Calibration and validation of the SWAMP model * Crop selection * Soils * Crop production * Irrigation scheduling *Best management practice

BACKGROUND

ORANGE-RIET

VAALHARTS

CASE STUDY: VAALHARTS (V6 & V7)

VAALHARTS

IS DUAL CROPPING UNDER CENTRE PIVOTS A JUSTIFIABLE IRRIGATION PRACTICE?

Soil properties Soil depth Mean Clay content (%) Bulk den (kg m -3 ) K sat (mm h -1 ) pH (H 2 O) CEC (cmol c kg -1 ) EC e (mS m -1 ) SAR MATERIAL AND METHODS: Soil information

Agronomic practices (East) Season1234 Crop rotationWheatMaizeFallowGroundnuts CultivarDuzziePannar 6126Aqua Planting date12 June Dec Nov 2008 Harvesting date29 Nov June July 2009 Planting density 150 kg ha plants ha kg ha -1 Total kg N ha Total kg P ha Total kg K ha Pest management -Eptam Treflin Temik Harnas Hammer Cultivation practices Plough, tiller & plant Bale, plough, disc, till & plant Disc, plough, till, & plant

Agronomic practices (v6, west) Season1234 Crop rotationPeasGroundnutsWheatCotton CultivarSolaraAquaDuzie - Planting dateJuly 2007Dec 2007June 2008Dec 2008 Harvesting date14 Nov 2007May Dec July 2009 Planting density 120 kg ha kg ha kg ha -1 Total kg N ha Total kg P ha Total kg K ha Pest management Galliant- Buctril MCPA Treflin Temik Roundup Metamidofos Cultivation practices Burn, plough, wonder till & plant Bale, burn, rip & plant Burn, wonder till & plant Bale, burn, rip & plant

Gain of water: Rainfall and Irrigation Evaporation and transpiration Salts will accumulate Leaching Drainage effluent (Degrading ground and surface waters) MATERIAL AND METHODS: Water balance

MATERIAL AND METHODS: Measurements

Rainfall Irrigation Soil water Water table depth East

Rainfall Irrigation Soil water Water table depth West

RESULTS ON SWB: EAST (V7) Crop∆WRIETD Wheat Maize Fallow Groundnuts

RESULTS ON SWB: WEST (V6) Crop∆WRIETD Peas Groundnuts Wheat Cotton

RESULTS ON YIELDS: EAST (V7) Crop Seed ( kg ha -1 ) Biomass ( kg ha -1 ) ActualPotActualPot Wheat Maize Fallow Groundnuts

RESULTS ON YIELDS: WEST (V6) Crop Seed ( kg ha -1 ) Biomass ( kg ha -1 ) ActualPotActualPot Peas Groundnuts Wheat Cotton

SeasonPivotDual crops Peak period (days) ET rate (mm day -1 ) 1 WestPeas505.9 EastWheat WestGroundnuts705.5 EastMaize457 3 WestWheat506.5 EastFallow 4 WestCotton506 EastGroundnuts704

CONCLUSION

Thank you