HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.
AGRI 2023

Changhee Son

Changhee Son, Speaker at Agriculture Conferences
Gyeongsangnam-do Agricultural Research and Extension Services, Korea, Republic of
Title : Effects of irrigation criteria on soybean grain yield and irrigation water use efficiencies under subsurface drip irrigation in a silt loam soil


Drought stress and yield instability have been increasing due to climate change. Subsurface drip irrigation (SDI) is a system to water crops through buried lines having embedded emitters with certain spacing. The SDI systems are usually installed below tillage depth, which can be intended for multiple-year use. The SDI is considered to be a very efficient irrigation system in terms of crop yield and water use efficiency as well as automated irrigation management. We evaluated the effects of irrigation criteria based on soil water content on soybean grain yield and irrigation water use efficiency under subsurface drip irrigation in a silt loam soil. Irrigation treatments consisted of 3 soil water content (SWC) with 25-26%, 20-21% and non-irrigated plot. SDI driplines were installed at a depth of
0.4 m below ground and 1.2 m spacing below every second ridge. The dripper delivery rate of 1 L h-1 was
operated under a pressure of 62-76kPa. Water was provided for10 minutes every 30 minutes from 08:00 to 18:00, from July 1, 2022 to October 23, 2022. Soil moisture sensor was installed at 0.3 m deep below soil surface of ridge and measured for the determination of volumetric SWC. The gross irrigation amounts at 25-26% and 20-21% SWC as irrigation criteria were 529.1 mm and 221.9 mm, respectively. The volumetric SWC at 25-26% soil water content irrigation ranged from 20.0% to 34.2% (25.0% at average), while at the non-irrigated plot ranged from 16.6% to 30.5% (21.2% at average). The differences in the SWC among the irrigation criteria increased as the days without rain got longer. The number of pod per plant significantly increased at 25-26% irrigation criteria compared to 20-21% treatment or non-irrigated plot. However, Soybean grain yield and irrigation water use efficiency were higher at 20-21% SWC irrigation than at 25-26%. Excessive irrigation might enhance vegetative growth, but delay maturing and result in increased incomplete grain. The irrigation criteria at 20-21% volumetric soil water content should be optimal for soybean production in silt loam soil.

Audience Take Away Notes

  • Drought stress greatly affects crop yield. Using a subsurface drip irrigation system, the yield of soybeans and irrigation water use efficiency were confirmed according to the soil moisture content.
  • The audience will know the difference in the yield of soybeans according to the soil moisture content in silt loam soil.
  • The audience will be helpful in examining the availability of SDI systems in dry areas.


Mr. Changhee Son studied Food technology at the Kyungbook National University, Republic of Korea. He then joined the upland crops research group at the Gyeongsangnam-do Agricultural Research and Extension Services (GNARES). He received Agronomy MS degree in 2023 at the Gyeongsang National University.


Signup for updates

By submitting this form, you are consenting to receive emails and notifications from Magnus Group. You can revoke your consent to receive emails at any time by using the Safe Unsubscribe link, found at the bottom of every email