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 - Irrigate when tensiometer in the 20-60 cm depth exceeds 300mb; average of two adjacent depths apply 80% of depletion to the trigger depth; full season.
 2.Irrigate as in treatment 1 except only after flower initiation.
 3.No irrigation

Basic Crop Management: PLANTED - 24 Jul 1981 (rows 0.9m apart); 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:
 Control - Irrigate when tensiometer in the 20-60 cm depth exceeds 300mb; average of two adjacent depths apply 80% of depletion to the trigger depth; full season.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - ; Pollination (R2) - ; Maturity - 21 Oct 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 2.14 Text File
Treatment 2:
  Irrigate as in treatment 1 except only after flower initiation.
  • Irrigation Dates and Amounts: Text Format;
  • Phenology: Emergence - ; Pollination (R2) - ; Maturity - 21 Oct 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 1.88 Text File
Treatment 3:
  No Irrigation
  • Phenology: Emergence - ; Pollination (R2) - ; Maturity - 21 Oct 1981
  • Stand Count:
  • Soil Water Pressure Observations: Tensiometer & Gypsum Block
  • Yield Soybeans, 12% moisture, T/ha: Average - 1.63 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.