P. DHAMODHARAN*, M. RAGURAMAKRISHNAN, N. ARIVUKKUMAR, K. KIRUTHIKA AND G. GUNALARASI
Department of Agronomy, AC&RI, TNAU, Coimbatore (Tamil Nadu), India
Department of Agronomy, Vanavarayar Institute of Agriculture, Pollachi (Tamil Nadu), India
Department of Agronomy, Dhanalakshmi Srinivasan University, Trichy (Tamil Nadu), India
*(e-mail: dhambala199@gmail.com)
(Received : 18 September 2023; Accepted : 28 September 2023)
SUMMARY
In the summer season of 2021, a research study was conducted at the Department of Agronomy, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Killikulam. The primary objective was to assess how varying doses of humic acid, in addition with the recommended fertilizer dose, affected the growth and physiological characteristics of African Tall fodder maize and CO 9 fodder cowpea under intercropping system. The study was structured by using randomized block design with 12 treatment combinations, each replicated three times. The study’s results highlighted that applying 125% of the recommended fertilizer dose, supplemented with enriched farmyard manure at a rate of 750 kg/ha, and applying 20 kg/ha of humic acid with addition of foliar spray treatments comprising 1.0% Urea and 0.5% CaCl2 (Treatment 8) were found to yield the highest plant height, number of leaves per plant, branches per plant, and increased dry matter production. Furthermore, this approach demonstrated superior physiological attributes, including agronomic growth rate, relative growth rate, and net assimilation rate at various crop growth stages. Notably, this treatment also exhibited the largest leaf area when compared to control treatments (Treatment 12).
Key words: Humic acid, intercropping, fodder production, physiological traits