Abstract

A study was undertaken to assess the effect of combined application of organic-P and inorganic-N fertilizers on yield and yield components of carrot (Daucus carota L.). The field experiment was conducted at Kombolcha ATVET College, South Wollo, Ethiopia.Seeds of carrot were sown on raised beds of a black clay soil. “Orga “and urea were used as sources of phosphorus and nitrogen, respectively, for the fertilizer treatments. The rates of fertilizers used in the experiment were, 309 kg “orga” ha^-1 combined with six rates of urea (0, 68.5, 267.2, 274,342.5 and 411 kg urea ha^-1). The field experiment was laid out in a randomized complete block design with seven fertilizer treatments, replicated five times. Yield and yield components of carrot were significantly influenced by the pre-harvest combined application of “orga” and urea treatments. Pre-harvest application of 309 kg “orga” ha^-1 combined with 274 kg urea ha^-1 increased yield of carrot by 46% compared to the control treatment. The values of yield components of carrot were also increased in response to the increased rate of combined “orga” and urea fertilizer application. The result showed that the combined application of 309 kg ha^-1 “orga”and 274 kg ha^-1 urea resulted in the maximum yield of carrot.

Key words: Carrot, “orga”, urea, yield, yield components.