Abuja Journal of Agriculture and Environment (AJAE)

GROWTH CHARACTERS AND PADDY YIELD OF UPLAND RICE (ORYZA SATIVA L.) AS INFLUENCED BY WEED MANAGEMENT STRATEGIES, SOURCE AND RATE OF BIOCHAR IN NORTHERN GUINEA SAVANNA
Author(s): Tabat, Y. K., Ishaya, D. B., Kura, H.N. and Amapu, I.Y.
Volume/Issue: Volume 1 , Issue 2 (2021)

ABSTRACT:

Field trials were conducted during 2018 and 2019rainy seasons on the research farm of the Institute for Agricultural Research (IAR), Ahmadu Bello University Samaru, Zaria (11o11ꞌN, 07o38ꞌE 686m above sealevel) in the Northern Guinea Savanna ecological zone of Nigeria. The experiment was carried out to evaluate growth characters and paddy yield of upland rice (Oryza sativa L.) as influenced by 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 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 9WAS) which is the farmers’ practice], three sources of biochar organic biomass (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 application of Saflufenacil + Dimethenamid-P at 0.5 kg a.i/ha+ one hand weeding at 9 WAS effectively controlled weeds and enhanced performance of plant height, leaf area index and crop growth rate which significantly increased paddy yield than other weed control methods. The incorporation of rice husk biochar at 2 t ha-1 gave highest performance for growth attributes and the resultant paddy yield than other sources and rates 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 ricehusk biochar at 2 t ha-1is most appropriate for enhancing growth and increasing paddy yield of upland rice at Samaru in the Northern Guinea Savanna ecological zone of Nigeria.

KEYWORDS:

weed management, biochar, upland rice, yield