Effect of poultry manure on the growth, yield and root-knot nematode (Meloidogyne spp.) infestation of carrot (Daucus carota L.)

Abstract

Currently, synthetic pesticides which are highly detrimental to man and the environment are the principal means of nematode control. However, the use of organic amendments might provide a sustainable control option as nematicidal properties have been identified in many animal wastes. A field experiment was carried out to determine the effectiveness of different levels of poultry manure (PM) applications on root-knot nematode infestation of carrot. There were four treatments (0, 2, 4 and 6 t/ha of PM) laid out in a randomised complete block design with four replications. The various levels of PM were worked into the soil on raised beds before carrot seeds were sown. Data were taken on growth performance (plant height, number of leaves and canopy spread), yield characteristics (root weight, root length and root girth) and infestation (root-galling index and nematode population in the soil). PM significantly reduced both root galling and nematode population with 4 t/ha significantly increasing yield characters of carrot. Since PM significantly reduced (p < 0.05) nematode infestation and promoted growth and yield of carrot, farmers are encouraged to use it preferably at 4 t/ha.