Abuja Journal of Agriculture and Environment (AJAE)

YIELD ATTRIBUTES AND YIELD OF UPLAND RICE (ORYZA SATIVAL.) AS AFFECTED BY 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 1 , Issue 1 (2021)

ABSTRACT:

Field trials were conducted during 2018 and 2019 wet 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 evaluate the performance of upland rice (Oryza sativa L.) as affected by weed management strategies, source and rate of biochar. The treatments consisted of three sources of biochar organic biomass (rice husk, groundnut shell and wood shavings), three rates of the biochar (0, 2 and 4 t ha-1) and three different weed management strategies [chemical weed control (Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha applied pre-emergence), integrated weed control method (Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha applied pre-emergence + one hand weeding at 9 WAS) and cultural weed control method (Hand weeding at 3, 6 and 9 WAS) which is the farmers’ practice]. 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. All the treatments were laid out in a Split-Plot Design and replicated three times. The results showed that integrated weed management gave the best weed control that enhanced performance of yield attributes such as grain weight per plant, number of grains per panicle and 1000-paddy weight which translated to higher paddy yield of 3.61 t ha-1compared to the chemical weed control. The application of biochar at 2 t ha-1 recorded the highest paddy yield of 3.74 t ha-1compared to the control. Incorporation of rice husk biochar enhanced yield parameters such as number of grains per panicle and 1000-paddy weight more than other sources of biochar that translated to paddy yield of 3.18 t ha-1. The results showed that integrated weed control and application of 2 t ha-1 rice husk biochar are considered most appropriate for paddy yield of upland rice at Samaru in the Northern Guinea Savanna ecological zone of Nigeria.

KEYWORDS:

weed management, biochar, upland rice, yield