Soybean Irrigation Study, 1981, Georgia Coastal Plain

Yield Comparisons:
Study:

Research Objective: Examine rooting depth and densities in response to soil water conditions under various management practices. This study was also used to compare root development in the vegetative stage with above ground growth and with yield.
Treatments:
 1.Control - Tensiometer at 30 cb vary 20-60 cm depth.
 2.Same as 1 except irrigate only after flower.
 3.No irrigation.

Basic Crop Management: PLANTED - 18 May 1981 (rows 0.9 m apart, placed 5 cm deep, seed rate 36-46 seeds/m); HARVEST - 29 Oct 1981 (gleaner 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 at 30 cb vary 20-60 cm depth.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 25 May 1981; Pollination (R2) - 05 Aug 1981; Maturity - 17 Sep 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 3.88 Text File
Treatment 2:
  Same as 1 except irrigate only after flower.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 25 May 1981; Pollination (R2) - 05 Aug 1981; Maturity - 17 Sep 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 3.28 Text File

Treatment 3:
  No irrigation.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - 25 May 1981; Pollination (R2) - 05 Aug 1981; Maturity - 17 Sep 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 3.33 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.