The effect of irrigation management and straw mulch on correlation analysis of traits with yield of peanut cultivars

Due to analyze the correlation and regression of agronomic traits (grain dimensions) with grain yield of two peanut cultivars under irrigation management conditions (water requirement) and plant mulch an experiment was done as factorial split plots based on completely randomized blocks design with 3 replications during 2019 in Astaneh Ashrafieh. The irrigation management in 3 three levels (no irrigation (rainfed), 50 and 100% of plant water requirement) as main factor and mulch application in 3 levels (0, 2 and 4 cm) and peanut cultivars in two levels (Guil and Gorgani) were considered as sub factor. The results showed that the interaction between irrigation and mulch had the highest seed yield in 100% of water requirement and 4cm of mulch application (2775 kg ha-1). The plant height at 100% of water requirement was 73.8cm which showed 13.7% and 7.7% increase than irrigation conditions and 50% of water requirement respectively. The highest plant height was obtained in 4 cm mulch treatment (75.5cm). In irrigation management, the highest seed length was obtained in 100% water requirement (2.4cm) and 4 cm mulch (2.4cm). The highest seed width was observed in 100% water requirement (1.2 cm), 4 cm mulch application (1.2 cm) and Guil cultivar (1.2cm). Seed yield was positively and significantly correlated (0.788**) with seed length. It can be concluded that with higher seed length, greater seed yield will be observed. Overall, water stress decreased yield and mulch application reduced the negative effects of water stress on both Guil and Gorgani cultivars. Guil cultivar showed higher resistance to waterdeficit stress compared to Gorgani cultivar.