Two field experiments were conducted on the Teaching and Research Farm of the Federal University of Agriculture, Abeokuta (7°15′ N, 3°25′ E, altitude 140 m above sea level) in south western Nigeria between June and November, 2012 to evaluate the performance of two sunflower varieties (SAMSUN-3 and Funtua) as affected by different sowing dates and organic fertilizer application. The experiment was laid out in split-split plot design with sowing dates as main plot, organic fertilizer as sub-plot and variety as sub-sub-plot, and replicated three times. Sowing date significantly (P 0.05) increased and reduced number of phenological days to flowering of early and late sown sunflower, respectively. Funtua (a local adapted variety) matured 7 days later than SAMSUN-3 (recently released variety) when sown late. Application of organic fertilizer significantly (P 0.05) increased plant height of early and late sown sunflower. Delay in sowing till first week in September significantly (P 0.05) reduced head diameter, number of seeds per head and seed yield of late sown sunflower. Oil and protein contents of seeds from early and late sown sunflower plants were significantly (P 0.05) increased by organic fertilizer application, except protein content of late sown sunflower. However, it significantly (P 0.05) increased oil yield by 23% relative to the control in the late sown sunflower. Based on the comparatively high seed yield (850.45-1,525.78 kg/ha) recorded in our study, it is recommended that sunflower *Corresponding author: V.I.O. Olowe,

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Purpose Transformation of nitrogen (N) from different manure sources to available forms to promote food security in context of rising climate change is vital. Effect of manure (types, nutrients, high rates and application time) on soil N transformation requires further investigation. This study evaluated effects of three animal manures on soil N mineralization of sandy clay loam. Methods A 22-week field study in a Randomized Complete Block Design (three replicates) was conducted using dried Cattle, Goat and Poultry Manures (CGPM), applied at 5, 10, 20, 40, 60, 80, 120 ? -N and NO 3 --N at 12 WAI. High rates of CGPM were not injurious to these soil properties; hence this has implication for N to maximize plants uptake as well as decrease losses to environment.

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