GRAIN YIELD AND YIELD COMPONENTS OF MAIZE (Zea mays L.) AS INFLUENCED BY VARIETY AND TIME OF NITROGEN TOPDRESSING IN GUINEA SAVANNA OF NIGERIA.

K M LADAN, A NAMAKKA, A H HASSAN, A B LAWAL, D M JIBRIN

Abstract


Two field trials were conducted during 2016 wet season at the Institute for Agricultural Research (IAR) farm (Lat.11o 11’ N, Long. 070 38’ E, 686m above sea level), Samaru-Zaria and Jaji cantonment farm which is located at 30 Km from Zaria along Kaduna – Zaria road (Lat. 10o 49’ 25” N, Long. 07o 34’ 10” E, 600m above sea level). All the experimental sites are in the Northern Guinea Savanna of Nigeria. The trials were established to study the varietal effect and influence of the time for second dose of nitrogen fertilizer application (topdressing) on growth and yield of maize. The treatments consisted of three varieties of maize (SAMMAZ 14, SAMMAZ 15 and SAMMAZ 16) and six periods of topdressing (4, 5, 6, 7, 8 and 9 WAS). Data were collected on number of grains per row, cob diameter, cob weight, 100 grain weight and grain yield. The results showed that SAMMAZ 16 was consistently superior in term of yield components (37g cob weight, 5.98cm, 7.86cm, 5.48cm cob diameter and 38.89g of 100 grain weight) and yield (3887.4kg and 2587.2kg) over the other varieties while SAMMAZ 14 (38.63g) was statistically at par with SAMMAZ 16 (38.89g) in term of 100 grain weight and grain yield (SAMMAZ 14: 3730.90kg at Samaru, 2474.10kg at Jaji while for SAMMAZ 16: 3887.40kg at Samaru, 2587.20kg at Jaji) respectively. However, topdressing (N) at 6 WAS, resulted to better yield and yield components. Therefore SAMMAZ 16 and topdressing at 6 WAS are recommended for better yield components and higher yield in Nigerian Guinea savanna.


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