Yield and Quality Response of Soybean to Full and Deficit Irrigation at Different Growth Stages under Sub-Humid Climatic Conditions

Abstract

This study investigated the yield and quality response of soybean [Glycine max L. Merr.] to full and deficit irrigation applied at different growth stages under sub-humid climate conditions over a two-year period. A rain-fed non-irrigated treatment and 13 different irrigation treatments 1 full and 12 deficit irrigations were applied to soybeans at four critical development stages: vegetative V , flowering F , pod formation P and seed enlargement S . Deficit irrigation had a significant effect on seed yield, crude oil content, crude protein content and various agronomic parameters. The highest seed yield 4004 kg ha-1 was obtained with full irrigation based on the replenishment of 100% of soil water depletion from a soil depth of 90 cm at 7-day intervals throughout the development period and the lowest 1974 kg ha-1 with the rain-fed treatment, with a 50.6% difference in average yield between full irrigation VFPS and rain-fed treatments. The rain-fed treatment also resulted in the lowest crude oil content 19.1% and the highest crude protein content 33.6% . As a result, it may be concluded that while VFPS treatment may be the best choice for maximum yield under local conditions, irrigation schedules should be reconsidered when water cost is high and/or water is scarce; in such cases, an irrigation schedule that includes water deficit at the vegetative development stage can be applied

Keywords

• kısıntılı sulama
• soya fasulyesi
• tane verimi
• verim bileşenleri
• yağ oranı
• protein oranı
• deficit irrigation
• soybean
• seed yield
• yield components
• crude oil content
• crude protein content