Draining Rice by Growth Stages

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Draining Rice by Growth Stages
Paul Counce, Brad Watkins, Kris Brye and Terry
Siebenmorgen,
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Central Idea from Previous Research

• Farmers can safely drain their rice earlier than
  widely practiced without reducing rough rice
  yield or head rice yield
• Acceptance of the practice has been limited
  rice growers still do not drain their rice as
  early as they can

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A new approach to draining rice

• a program for draining rice which integrates
  rice crop water usage, rice developmental
  timing soil water contents at draining.

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Outline

• The rice growth staging system
• Timing of reproductive growth stages
• Water use by the rice crop
• Timing by DD50
• Water use per growth stage
• Water available after soil is drained
• Putting components together

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THERMAL TIME ? C D-1
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Green Minimum for growth stage Blue Maximum
for growth stage
Days per Growth Stage
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mm water per Growth Stage
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Calculation for Francis rice at Gillett 2005
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Stuttgart Results
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DeWitt 2006 Results
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DeWitt Results
NA Not available (havent done it yet)
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Cost of 7.6 ha cm of water assuming different
pump lifts with diesel costing 0.67/liter
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Payoff from early draining

• Reduced water costs or greater water availability
  for watering soybeans
• Reduced tillage costs
• Potential savings of 23-48/acre