Maize Irrigation Study, 1979, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objective: Determine the effect of depth of water contol zone and of nitrogen management on yield, nitrogen utilization and water use for an irrigated corn-soybean sequential multicrop.
Treatments:
 1.Control - Tensiometer - shallow 15-30 cm at 30cb
 2.Tensiometer - deep 45-60 cm at 30cb
 3.No irrigation

Basic Crop Management: PLANTED - 09 Mar 1979 (placed 2.5-3 cm deep); HARVEST - 10 Jul 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:
 Control - Tensiometer - shallow 15-30 cm at 30cb
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - ; Pollination (R2) - 25 May 1979; Maturity (Black layer) - 30 Jun 1979
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 10.46; Individual plots - 10.43, 12.07, 10.31, 9.03 Text File
Treatment 2:
  Tensiometer - deep 45-60 cm at 30cb
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - ; Pollination (R2) - 25 May 1979; Maturity (Black layer) - 30 Jun 1979
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: Average - 10.19; Individual plots - 10.47, 10.36, 8.79, 11.13 Text File
Treatment 3:
  No irrigation
  • Phenology: Emergence - ; Pollination (R2) - 25 May 1979; Maturity (Black layer) - 30 Jun 1979
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Corn Grain, 15.5% moisture, T/ha: 5.70 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.