Effects of waterlogging time on growth, physiology and yield of peanut cultivar L14 (Arachis hypogaea)

Abstract

This study was conducted to evaluate the effects of waterlogging time on growth, physiology and yield of L14 peanut cultivar in the grasshouse of Faculty of Agronomy (Vietnam National University of Agriculture, Ha Noi) in Spring 2020. The experiment was designed as a randomized block design with 2 factors. Factor 1 was irigation regime including CT1: normal irrigation and CT2: waterlogging for 10 weeks and then drainage (soil moisture: 70 - 80%); Factor 2 was the time of waterlogging, including waterlogging at the seedling (3 leaves stage), flowering (25 days after begining of flowering), and full pod stages (65 days after begining of flowering). The results showed that waterlogging reduced both growth and physiological parameters, such as plant height, primary branch length, number of leaves/plant, fresh weight and dry matter, and nodule formation, soil plant analysis development index, and chlorophyll fluorescence efficiency. Only the increased ion leakage indicated the level of waterlogging stress. However, waterlogging at the seedling stage had a great impact on the number of pod per plant, and the pod set rate resulted in a 60.3% reduction in the individual yield of the cultivar L14 compared to the control. Meanwhile, waterlogging at the flowering and full pod stages caused a similar decrease in yield of peanut cultivar L14 ( 31%). Thus, waterlogging at the seedling stage for 10 weeks had the greatest effect on the yield of peanut variety L14.