( *1 Ph.D. Scholar, 2 Assistant Professor 3 B. Tech and 4 M. Tech) Eco. Env. & Cons. 28 (4) : 2022; pp. (1766-1772) Copyright@ EM International ISSN 0971–765X Assessment of crop water requirement and yield attributes of groundnut under drip irrigation with black plastic mulch S. Rahaman 1 *, K. N. Raja Kumar 2 , B. Hareendra Goud 3 and V. Yamuna Tejaswi 4 1 Department of Farm Machinery and Power Engineering, 2,4 Department of Soil and Water Engineering Dr. NTR College of Agricultural Engineering, Bapatla 522 101, India Acharya N.G. Ranga Agricultural University, Lam, Guntur (Dist.), Andhra Pradesh, India (Received 14 March, 2022; Accepted 14 May, 2022) ABSTRACT Groundnut (Arachis hypogaea L.) variety of TAG-24 was selected for the experiment with four treatments namely drip-T 1 , drip with mulch-T 2 , mulch-T 3 and control-T 4 . The research objective is to study crop-water requirement, uniformity coefficient, yield attributes such as yield, plant height, root length, number of pods m -2 , seed and shell weight m -2 . Crop water requirement (CWR) for groundnut crop was calculated as 449.1 mm by CROPWAT 8.0 Software. Experiments were conducted by supplying different amount of water among various treatments such as 100% of CWR in T 4 , 90% of CWR in T 1 & T 3 and 80% CWR in T 2 respectively. Uniformity coefficient was found as 0.86 for drip irrigation. Highest and lowest yield was reported in T 2 as 4.45 t ha -1 and 2.89 t ha -1 in T 4 . Among all the treatments plant height and root length was reported highest as 52 cm and 48 cm in T 2 , similarly number of podsm -2 , seed and shell weight m -2 were reported highest as 583, 0.47 kg and 0.24 kg in T 2 respectively. The yield attributes were observed highest in T 2 because of efficient water application at root zone by drip, controlled weed growth and conserved soil moisture by mulch which creates favorable conditions for plant growth. Key words: Black polyethylene mulch, CROPWAT 8.0 Software, Crop water requirement (CWR), Drip irrigation system, Groundnut and Yield attributes. Introduction The groundnut (Arachis hypogaea, L.) is a prominent oilseed and food crop, which ranked 4 th and 14 th in the world (Ahmed et al., 2016) contributes for 40% of total national oilseed output (Priya et al., 2013). Ac- cording to the Indian agricultural statistics at a glance 2018, groundnut yields 9.18 million tonnes per year on 4.91 million ha, with average yield of 1868 kg ha -1 . It generates 1.04 million tonnes per year in 0.74 million hectares in Andhra Pradesh, with average of 1416 kg ha -1 productivity. In terms of both land and groundnut output, India is the world’s big- gest country. After Rajasthan and Gujarat, Andhra Pradesh is 3 rd largest producer of groundnuts. Groundnut largely cultivated in Rayalaseema dis- tricts of Anantapur, YSR Kadapa, Kurnool, and Chittoor, as well as along the Andhra Pradesh coastal lines. Water is primary source of life for all living or- DOI No.: http://doi.org/10.53550/EEC.2022.v28i04.014