Maize Irrigation Study, 1984, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objectives:

    1. Determine number of irrigations and amount of water required by treated corn when irrigation is by demand by treatments.
    2. Determine relative rates of water consumption during various drydown periods.
    3. Determine water use efficiency WUE (ET) and WUE (IR) of treated corn.
    4. Determine relative morphological and physiological changes in treated corn.
Treatments:
 1.Control - On demand - bas rate 0.000
 2.On demand - bas rate 0.003
 3.On demand - bas rate 0.006
 4.On demand - bas rate 0.012
 5.Stress - bas rate 0.000
 6.Stress - bas rate 0.003
 7.Stress - bas rate 0.006
 8.Stress - bas rate 0.0012
 9.No irrigation - bas rate 0.000
 10.No irrigation - bas rate 0.003
 11.No irrigation - bas rate 0.006
 12.No irrigation - bas rate 0.012

Basic Crop Management: PLANTED - 19 Mar 1984 (placed 5-7.5 cm deep); HARVEST - 10 Jul 1984; 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:
 Control - On demand - bas rate 0.000
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 8.70; Individual plots - 8.80, 7.90, 9.80, 8.30 Text File
Treatment 2:
 On demand - bas rate 0.003
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 7.68; Individual plots - 7.60, 7.50, 6.90, 8.70 Text File
Treatment 3:
 On demand - bas rate 0.006
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 7.47; Individual plots - 8.25, 7.24, 9.80, 4.58 Text File
Treatment 4:
 On demand - bas rate 0.012
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 6.03; Individual plots - 6.26, 5.19, 8.30, 4.38 Text File
Treatment 5:
 Stress - bas rate 0.000
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 8.66; Individual plots - 10.09, 9.22, 8.48, 6.83 Text File
Treatment 6:
 Stress - bas rate 0.003
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 8.66; Individual plots - 9.75, 8.03, 9.75, 7.11 Text File
Treatment 7:
 Stress - bas rate 0.006
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 7.55; Individual plots - 6.77, 8.10, 8.00, 7.34 Text File
Treatment 8:
 Stress - bas rate 0.012
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 8.23; Individual plots - 9.34, 8.05, 6.04, 9.56 Text File
Treatment 9:
 No irrigation - bas rate 0.000
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: 0.00 Text File
Treatment 10:
 No irrigation - bas rate 0.003
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: 0.00 Text File
Treatment 11:
 No irrigation - bas rate 0.006
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: 1.65 Text File
Treatment 12:
 No irrigation - bas rate 0.012
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 27 Mar 1984; Pollination (R2) - 08 Jun 1984; Maturity (Black layer) - 02 Jul 1984
  • Stand Count:
  • Yield Corn Grain, 15.5% moisture, T/ha: 2.57 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.