Field experiments were conducted in 2010 cropping season at the Research Centre of the College of Agriculture, Mampong Campus of the University of Education, Winneba (latitude 7? and 8? North of Equator and Longitude 1?and 24? West of the Greenwich) in the forest transitional zone of Ghana to evaluate the effect of three levels of grasscutter manure (GM), chicken manure (CM), and NPK on soil chemical properties, growth and yield of carrot. The treatments were, no fertilizer or manure (control), 300kgNPK/ha, 10tCM/ha, 3 levels of grasscutter manure (10t, 15t and 20t/ha), laid out in a randomized complete block design with 3 replications. The 3 levels of grasscutter manure and chicken manure enhanced the soil organic C, total N, available P, exchangeable K, Ca, Mg and CEC better than NPK and the control treatments. Organic matter content and percent base saturation were high in the amended plots than the control. Plant height, number of leaves, leaf chlorophyll content, root length, root diameter and root yield for the 15 and 20t/ha grasscutter manure performed better than the rest of the amendments. The study showed that among the organic manures evaluated, grasscutter manure of 15 and 20t/ha gave the improved levels of the soil chemical properties and yield of carrot.