Maize Irrigation Study, 1979, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objective: To compare the ability of two models versus tensiometers to determine the irrigation requirements of late season corn.
Treatments:
 1.Dejager model
 2.Lambert model
 3.Control - Tensiometer - shallow 15-30 cm at 30 cb
 4.No irrigation

Basic Crop Management: PLANTED - 17 Jul 1979; HARVEST - 20 Nov 1979 (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:
  Dejager model
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 06 Aug 1979; Pollination (R2) - 24 Sep 1979; Maturity (Black layer) -
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 3.21; Individual plots - 2.48, 2.57, 3.04, 3.25, 3.78, 4.15 Text File
Treatment 2:
  Lambert model
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 06 Aug 1979; Pollination (R2) - 24 Sep 1979; Maturity (Black layer) -
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 3.87; Individual plots - 4.68, 3.69, 4.03, 3.77, 3.58, 3.48 Text File
Treatment 3:
 Control - Tensiometer - shallow 15-30 cm at 30 cb
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 06 Aug 1979; Pollination (R2) - 24 Sep 1979; Maturity (Black layer) -
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 3.77; Individual plots - 3.58, 3.79, 4.41, 3.82, 3.25, 3.78 Text File
Treatment 4:
  No irrigation
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 06 Aug 1979; Pollination (R2) - 24 Sep 1979; Maturity (Black layer) -
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 3.18; Individual plots - 2.16, 3.58, 3.98, 2.87, 3.12, 3.34 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.