_____________________________________________________________________________________________________ *Corresponding author: E-mail: uchenna.ukwu@unn.edu.ng; Asian Journal of Research in Agriculture and Forestry 6(3): 1-7, 2020; Article no.AJRAF.58515 ISSN: 2581-7418 Comparative Effects of Different Levels of Kolgrace Organic Fertilizer on the Growth and Yield Attributes of Greengram (Vigna radiata (L) Wilczek) in the Screenhouse P. N. Ihejiofor 1 , U. N. Ukwu 1,2* and G. O. Adeoye 1 1 Department of Agronomy, University of Ibadan, Ibadan, Nigeria. 2 Department of Crop Science, University of Nigeria, Nsukka, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. Author GOA designed the study and supervised the experiment. Authors PNI and UNU managed data collection, wrote the protocol and wrote the first draft of the manuscript. Author UNU performed the statistical analysis, managed the analyses of the study. Authors PNI and UNU managed the literature searches. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJRAF/2020/v6i330104 Editor(s): (1) Dr. Odunze Azubuike Chidowe, Ahmadu Bello University, Nigeria. (2) Dr. Cengiz Yucedag, Mehmet AkifErsoy University, Turkey. (3) Dr. Nebi Bilir, Isparta University of Applied Sciences, Turkey. Reviewers: (1) Shweta Sahni, Shri Guru Ram Rai University, India. (2) Jamini Saikia, Assam Agricultural University, India. Complete Peer review History: http://www.sdiarticle4.com/review-history/58515 Received 10 May 2020 Accepted 16 July 2020 Published 29 July 2020 ABSTRACT Aim: To investigate growth and yield response of greengram to different levels of Kolgrace organic fertilizer with a view to determining the most favorable application rate for greengram production. Study Design: Completely randomized design (CRD) with treatments replicated five (5) times. Place and Duration of Study: Screenhouse of the Department of Agronomy, University of Ibadan, Nigeria, between July to November 2016. Methodology: Six levels of kolgrace organic fertilizer were used (0.00, 0.50, 1.00, 2.00, 4.00 and 8.00 t ha -1 ). Top soil (0 -15 cm) was collected from the Teaching and Research Farm of the Department of Agronomy, and leached of nutrients by soaking and washing in water for 24 hours. 2 kg of air-dry soil was mixed with the appropriate fertilizer rate and filled in each pot. 3 seeds were Original Research Article