Effects of deficit irrigation (RDI) and partial root-zone drying (PRD) on yield, yield components and physiological characteristics of mungbean (Vigna radiate L.)

Document Type : Original Article

Authors

1 MS.C. student,. Department of Agronomy and Plant Breeding, Faculty of Agriculture,,Ilam University. Ilam. Iran

2 Assistant Professor, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Ilam University. Ilam. Iran.

3 Assistant Professor. Department of Irrigation and Drainage Engineering, Faculty of Agriculture, Ilam University. lam. Iran

4 Department of Agronomy and Plant Breeding,. Faculty of Agriculture, Ilam University. Ilam. Iran

Abstract

To study the effect of deficit irrigation (DI) and partial Root-Zone Drying (PRD) on yield and physiological characteristics of mungbean, a field experiment was conducted as a split plot experiment in a randomized complete block design with three replications and nine treatments at the research farm, Faculty of Agriculture, Ilam University during growing season in 2022. Treatments included three levels of deficit irrigation (100 (without stress), 70 (moderate stress) and 50% (severe stress) of field capacity) as main plots and three irrigation methods including; usual irrigation, fixed partial root-zone drying (FPRD) and alternative partial root-zone drying (APRD) as subplots. Results showed that the highest yield (2187.37 kg.ha-1) and total chlorophyll (2.28 mg.g-1fresh weigh) in the treatment without stress and usual irrigation and the lowest yield (570.70 kg.ha-1) and Total chlorophyll (1.11 mg.g-1fresh weigh) was obtained under severe stress conditions and usual irrigation method. Drought stress increased the content of malondialdehyde (32%), catalase (69%) and ascorbate peroxidase (63%) compared to non-stress conditions. In severe and moderate stress, the use of APRD compared to usual irrigation, increased yield, RWC, photosynthetic pigments and antioxidant activity in mung bean plants. However, these effects were not observed in the FPRD. In moderate stress, APRD with water saving showed a yield close to that of the control treatment. The results showed that in deficit irrigation, APRD was effective in reducing the effects of drought stress in the mung bean plant.
Keywords: Antioxidants, drought stress, Chlorophyll, Proline

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