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Oloyede-Kamiyo Qudrah Olaitan,Olaniyan Amudalat Bolanle,Abdul-Waheed Jafar Ayinde,Akinseye Benson Akinloye 한국작물학회 2021 Journal of crop science and biotechnology Vol.24 No.5
Low soil nitrogen (N) is one of the major abiotic stresses reducing maize yield in Africa. Twenty-fve maize varieties which included quality protein maize (QPM), drought and Striga tolerant maize, and two low soil nitrogen (LN) tolerant maize as checks, were evaluated in two locations between 2017 and 2018 to identify varieties with tolerance to LN. The feld was mopped of nitrogen by planting maize twice without fertilizer and the soil was analyzed before the trial. The experiment was laid out in a randomized complete design in three replications. Urea fertilizer was applied in a split dose at 2 and 4 weeks after planting at rate of 30kgN/ha for low nitrogen (LN) and 90kgN/ha for high nitrogen (HN) plot. Data were collected on days to fowering, anthesis-silking interval, leaf death, grain yield, and other agronomic parameters. Data were subjected to analysis using SAS. Rank summation index (RSI) and cluster analysis were used to select the best varieties under LN. Apart from the two checks, varieties DT STR -Y2 SYN and TZE COMP3 DT had good yield of 1.99 tons/ha and 1.39tons/ ha, respectively, under LN, with yield gap of 0 and 44%, respectively. The top ranked varieties under LN using RSI either appear singly or in a group under cluster analysis. They included drought and Striga tolerant varieties along with the two LN checks, implying that Striga tolerant maize also possesses the ability to tolerate LN. The varieties could, therefore, be involved in a breeding program for improvement for low soil nitrogen. Low soil nitrogen (N) is one of the major abiotic stresses reducing maize yield in Africa. Twenty-fve maize varieties which included quality protein maize (QPM), drought and Striga tolerant maize, and two low soil nitrogen (LN) tolerant maize as checks, were evaluated in two locations between 2017 and 2018 to identify varieties with tolerance to LN. The feld was mopped of nitrogen by planting maize twice without fertilizer and the soil was analyzed before the trial. The experiment was laid out in a randomized complete design in three replications. Urea fertilizer was applied in a split dose at 2 and 4 weeks after planting at rate of 30kgN/ha for low nitrogen (LN) and 90kgN/ha for high nitrogen (HN) plot. Data were collected on days to fowering, anthesis-silking interval, leaf death, grain yield, and other agronomic parameters. Data were subjected to analysis using SAS. Rank summation index (RSI) and cluster analysis were used to select the best varieties under LN. Apart from the two checks, varieties DT STR -Y2 SYN and TZE COMP3 DT had good yield of 1.99 tons/ha and 1.39tons/ ha, respectively, under LN, with yield gap of 0 and 44%, respectively. The top ranked varieties under LN using RSI either appear singly or in a group under cluster analysis. They included drought and Striga tolerant varieties along with the two LN checks, implying that Striga tolerant maize also possesses the ability to tolerate LN. The varieties could, therefore, be involved in a breeding program for improvement for low soil nitrogen