Peanut Irrigation Study, 1987, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objective:

    1. Compare irrigation scheduling techniques for their ability to meet peanut water needs - yield effects and water use efficiency.
    2. Compare model predictions of soil water with measured soil water.
    3. Measure changes in water content by depth during a 7 to 10 day drydown period and to measure root distribution at the end of the drydown.
    4. Measure in-situ hydraulic conductivity with the Guelph permeameter, and ponded infiltration with the saturated and unsaturated filtrometer.
Treatments:
 1.Control - Tensiometer at 30 cb in 20-60 cm depths
 2.PNUTGRO model
 3.EXSYS model
 4.No irrigation

Basic Crop Management: PLANTED - 07 Ma 1987 (placed 5 cm deep); HARVEST - 28 Sep 1987; TILLAGE - Moldboard Plow (25 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 at 30 cb in 20-60 cm depths
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 16 May 1987; Pollination (R2) - 15 Jun 1987; Maturity - 22 Sep 1987
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Peanuts, 7% moisture, T/ha: Average - 4.80; Individual plots - 3.99, 5.30, 5.43, 4.47 Text File
Treatment 2:
  PNUTGRO model
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 16 May 1987; Pollination (R2) - 15 Jun 1987; Maturity - 22 Sep 1987
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Peanuts, 7% moisture, T/ha: Average - 4.34; Individual plots - 5.25, 6.24, 3.73, 2.14 Text File
Treatment 3:
  EXSYS model
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 16 May 1987; Pollination (R2) - 15 Jun 1987; Maturity - 22 Sep 1987
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Peanuts, 7% moisture, T/ha: Average - 4.93; Individual plots - 6.96, 4.55, 3.37, 4.85 Text File
Treatment 4:
  No irrigation.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 16 May 1987; Pollination (R2) - 15 Jun 1987; Maturity - 22 Sep 1987
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Peanuts, 7% moisture, T/ha: Average - 3.94; Individual plots - 4.15, 3.44, 3.98, 4.17 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.