PROFITABILITY OF UPLAND RICE (Oryza sativa L.) PRODUCTION UNDER DIFFERENT WEED MANAGEMENT STRATEGIES, SOURCE AND RATE OF BIOCHAR IN NORTHERN GUINEA SAVANNA.

Author(s): Tabat, Y. K., D. B. Ishaya., H.N. Kura and I.Y. Amapu.
Volume/Issue: Volume 2 , Issue 1 (2022)

ABSTRACT:

Field trials were conducted during 2018 and 2019 rainy seasons on the research farm of the Institute for Agricultural Research (IAR), Ahmadu Bello University Samaru, Zaria (11o11ꞌN, 07o38ꞌE 686m above sea level) in the Northern Guinea Savanna ecological zone of Nigeria. The experiment was carried out to assess the profitability of upland rice (Oryza sativa L.) production under different weed management strategies, source and rate of biochar. The treatments consisted of three different weed management strategies [chemical weed control (Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha applied pre-emergence), integrated weed control (Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha applied pre-emergence + one hand weeding at 9 WAS) and cultural weed control (Hand weeding at 3, 6 and 9 WAS)], three sources of biochar (rice husk, groundnut shell and wood shavings) and three rates of the biochar (0, 2 and 4 t ha-1). All the treatments were laid out in a Split-Plot Design and replicated three times. The three rates of biochar and three different weed management strategies were factorially combined and laid out as the main plot treatment. The sub-plot treatments consisted of the three sources of biochar. The results showed that application of Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha + one hand weeding at 9 WAS in combination with rice husk biochar at 2 t ha-1 gave the highest return on investment of ₦469, 417.50 and a profit of ₦2.75 per every naira invested and is considered most profitable for upland rice production at Samaru in the Northern Guinea savanna ecological zone of Nigeria.

KEYWORDS:

Weed Management, Biochar, Upland Rice, Profit