Soybean Irrigation Study, 1980, Georgia Coastal Plain
Study:
  • Crop: Soybeans - 'Coker' , 'Cobb'
  • Year: 1980
  • Location: USA, GA, Tift County, Gopher Ridge Farm, Block E2
  • Soil Type, USDA Series: Bonifay sand
  • Meteorological Observations: Gopher Ridge, 80

Research Objectives:

    1. Examine rooting depth and densities in response to soil water conditions under various management practices.
    2. Compare root development in the vegetative stage with above ground growth and with yield.
Treatments:
 1.Irrigate when tensiometers in the 15-45 cm root zone indicate suction greater than 20 cb. Entire growth season.
 2.Irrigate two days after trigger through the entire growth season.
 3.Irrigate four days after trigger throughout the entire growth season.
 4.Irrigate four days after trigger until flowering. Irrigate two days after trigger thereafter.

Basic Crop Management: PLANTED - 14 May 1980 & 18 Jun 1980; HARVEST - ; 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:
 Irrigate when tensiometers in the 15-45 cm root zone indicate suction greater than 20 cb. Entire growth season.
  • Phenology: Emergence - 18 Mar 1982; Pollination (R2) - 31 May 1982; Maturity (Black layer) - 06 Jul 1982
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
Treatment 2:
 Irrigate two days after trigger through the entire growth season.
  • Phenology: Emergence - 18 Mar 1982; Pollination (R2) - 31 May 1982; Maturity (Black layer) - 06 Jul 1982
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
Treatment 3:
 Irrigate four days after trigger throughout the entire growth season.
  • Phenology: Emergence - 18 Mar 1982; Pollination (R2) - 31 May 1982; Maturity (Black layer) - 06 Jul 1982
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
Treatment 4:
 Irrigate four days after trigger until flowering. Irrigate two days after trigger thereafter.
  • Phenology: Emergence - 18 Mar 1982; Pollination (R2) - 31 May 1982; Maturity (Black layer) - 06 Jul 1982
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
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.