Abstract:
This study was done to determine the effects of varying soil moisture regimes on CO2 assimilation of
soybean [Glycine max (L.) Merrill] in pots under greenhouse conditions during 2017 and 2018 cropping
seasons. The experiment was conducted as a Randomized Complete Block Design (RCBD) in a 4 x 6
factorial treatment arrangement and replicated 3 times. Soil moisture regimes (80, 60, 40 and 20% of
field capacity) and cultivars (Gazelle, Nyala, EAI 3600, DPSB 8, Hill and DPSB 19) were first and second
factors, respectively. Collected data were subjected to Analysis of Variance (ANOVA) using Linear
Mixed Model in GENSTAT. Significantly different treatment means were separated using Tukey’s test at
0.05 significance level. Leaf relative water content, stomata conductance, photosynthesis rate and substomatal
CO2 concentrations significantly (P < 0.001) declined with increasing soil moisture stress.
Total leaf chlorophyll content increased (P < 0.001) with increased soil moisture stress. Cultivars DPSB
19 and DPSB 8 had relatively higher leaf relative water content and stomata conductance at reduced
soil moisture regime at 20% moisture from field capacity indicating moisture stress tolerance potential
of the cultivars.
Key words: Flowering stage, podding stage, seasons, soil moisture regimes, soybean cultivars.
