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In field Rainwater Harvesting for Improved Maize Production

UEM-FAEF. In field Rainwater Harvesting for Improved Maize Production (Synthesis Results – Lessons & Challenges). By Mário Chilundo & Paiva Munguambe. Final Scientific Workshop JHB, 15-18 th June 2009. Main Objective of the trials.

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In field Rainwater Harvesting for Improved Maize Production

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  1. UEM-FAEF • In field Rainwater Harvesting for Improved Maize Production • (Synthesis Results – Lessons & Challenges) By Mário Chilundo & Paiva Munguambe Final Scientific Workshop JHB, 15-18th June 2009

  2. Main Objective of the trials Increase water availability for crop growth though in field water harvesting technique

  3. RWH principle

  4. RWH principle… Chókwè

  5. Introduction… Semi-Arid region October to March: rainy season with 75 % of the annual rain; April to September: dry season with 25 % of the annual rain. Chókwè’s average annual rainfall: 582.0 mm

  6. Balanço hídrico(Pr-ETc) Water balance (Pr-ETc)

  7. Study area Chókwè

  8. Methodology • On station trials (EAC) • Design: RCBD • Crop: Maize (Matuba: 120 days; Potential yield: 5-6 ton/ha) • Seasons (2006/07; 2007/08 and 2008/9) • Mulch: 20 ton/ha (vegetable residues) • Rain gauge: Precipitation • Parameters: plant height and grain yield

  9. RWT principle Plastic cover Runoff • RWT: Catchment area covered by PVC plastic • Ratio: control S80 (80*30 cm; 1:1); S160 (160*30 cm; 1:2) and S240 (240*30 cm; 1:3) – 8 rows/plot (6 effectives+ 2 border) Catchment Area (CTA) 160X30 cm Cropping Area (CA) 80X30 cm Ratio (CTA/CA) = 2:1

  10. Trials…

  11. Maize grain yield (ton/ha) 2007/08 a a growing period growing period Total of 392 mm Total of 471.1 mm b A B 2008/09 C

  12. Results (WUE – Water Productivity)

  13. Estimated Costs (500 m2 plot)

  14. Final remarks/challenges • Ratios 1:2 (S160) and 1:3 (S240) increased water availability for the crop, resulting in higher grain yields per plant and thus increase WUE; • Climate change vs rainfall patterns vs sowing dates need to be addressed because they will have impact on the yields; • Need to test other “local” material as alternative due to high investments costs (plastic) ; • Need to consider IPDM and fertilizers to increase water productivity and yields

  15. OBRIGADO

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