Influence of Different Levels of Hydrogel on Root Nodulation in Chickpea (Cicer arietinum L.)

This study investigated the impact of varying levels of hydrogel on the root nodules of Chickpea (Cicer arietinum L.) during Rabi seasons of 2019-20 and 2021-22 at the Department of Biological Sciences, Sam Higginbottom Institute of Agriculture, Technology, and Sciences, (U.P). The experimental design was a randomized block design with four levels of hydrogel (25%, 50%, 75% and 100%) and two levels of irrigation (one irrigation and two irrigation) and all treatments replicated thrice. Observations on the number of nodules per plant, active nodules, and inactive nodules were recorded at 30, 60, and 90 days after sowing (DAS) and at maturity and analysed using Fisher's ANOVA. The results indicated that hydrogel application significantly affected nodule formation at all growth stages across both years. The highest number of nodules, active nodules, and inactive nodules were recorded in treatment T10 (2 irrigations + 100% hydrogel), followed by T9 (2 irrigations + 75% hydrogel), in both years. The enhanced nodule formation with hydrogel application was attributed to improved water availability to the roots during periods of water scarcity, highlighting hydrogel's role in optimizing nitrogen availability and promoting chickpea growth, which is crucial for enhancing soil fertility.