Field Productivity of Carrot (DaucuscarotaL.) in Adamawa Cameroonand Chemical Properties of Roots According ToChicken Manure Pretreatments and Vivianite Powder

Abstract

Field trial was carried out in the Sudano-Guinean zone of Cameroon to investigate the effect of pretreatment of chicken manures and vivianite powder (applied as mineral supply) on agronomic parameters of carrot plants (Daucus carota L.) and some chemical properties of carrot roots. Randomized complete block design with 11 treatments and three replications was used. Treatments were applied per plant: T0 = control; P5 = 5g vivianite powder, P10 = 10g vivianite powder, FS1 = 0.25g dried manure, FS2 = 0.5kg dried manure; FC1=0.25 Kg composted manure; FC2=0.5 Kg composted manure; X1=0.25 Kg dried manure+0.25 Kg composted manure; X2=0.5 Kg dried manure + 0.5 Kg composted manure; X3=0.5 Kg composted manure + 0.25 Kg dried manure; X4=0.25 Kg composted manure + 0.5 Kg dried manure. Growth parameters (plant height and number of leaves) and production parameters (length of root, fresh weight of root and root yield) are evaluated. Results show that plants from X2 presented significantly (p <0.05) highest plants height: 26.18 ± 4.62 cm; length of root: 17.53 ± 2.4 cm; weight of fresh root: 68.48 ± 1.79 g; root yield: 7.28 ± 1.12 t/ha. Β-Carotene content of carrot root ranged from 0.85 for T0 to 10.86 mg/100 gMF for X2. In conclusion, X2 treatment should be recommended to carrot growers of Adamawa –Cameroon. But several studies on chemical properties of carrot root need to be investigated