Maize Irrigation Study, 1998, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objective:
Treatments:
 1.Adcon - when readings from any depth are above 35 cb, Apply 3.0 cm of water.
 2.Control - On time full irrigation, 3.0 cm
 3.On time deficit irrigation, 2.0 cm
 4.No irrigation
 5.Two scheduled irrigations
 6.Three scheduled irrigations

Basic Crop Management: PLANTED - 25 Mar 1998; HARVEST - 27 Jul 1998 (2-row grain combine); TILLAGE - Moldboard Plow (30 cm deep plus smoothing and bed shaping), wheel traffic controlled at 1.2 m centers; FERTILIZATION - Typical Extension Recommended Rate; WEED & PEST CONTROL: Typical Extension Recommendations.
Chronological Treatment and Observation Details

Observations and data sets for individual treatments (crop years) follow:
Treatment 1:
 Adcon - when readings from any depth are above 35 cb, Apply 3.0 cm of water.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 7.90; Individual plots - 8.85, 7.83, 7.69, 7.21, 7.91 Text File
Treatment 2:
 Control - On time full irrigation, 3.0 cm
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 7.65; Individual plots - 7.11, 7.84, 8.11, 9.67, 5.53 Text File
Treatment 3:
 On time deficit irrigation, 2.0 cm
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 6.49; Individual plots - 7.25, 8.13, 5.62, 6.06, 5.37 Text File
Treatment 4:
 No irrigation
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 1.09; Individual plots - 0.28, 1.52, 2.27, 1.22, 0.17 Text File
Treatment 5:
 Two scheduled irrigations
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 2.27; Individual plots - 1.93, 2.67, 0.82, 5.38, 0.54 Text File
Treatment 6:
 Three scheduled irrigations
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 02 Apr 1998; Pollination (R2) - 01 Jun 1998; Maturity (Black layer) - 29 Jun 1998
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 5.04; Individual plots - 5.96, 4.99, 5.32, 7.01, 1.90 Text File
For more information on the study and its interpretation contact:
Dr. Jim Hook Professor, Soil and Water Management
Crop and Soil Sciences Department and NESPAL
The University of Georgia, College of Agricultural and Environmental Sciences
P.O. Box 748, Tifton, GA 31793-0748
e-mail: jimhook@tifton.cpes.peachnet.edu

Page developed by James E. Hook, Amanda Richards, and Linsey Forlow.
Last Modified on 29 June 2000.