Lecturer II , University of Nigeria Nsukka
Tillage management and organic fertilizer application are among the important factors affecting soil properties and yield of crops. A two-year field experiment was conducted to investigated the effect of different levels of abattoir waste (AW) and tillage on soil properties and yield of cowpea in Nkpologu soil series of Nsukka, Enugu State, Nigeria. The experiment was laid out as a spilt plot in a randomized complete block design (RCBD). Effects of two tillage system (conventional tillage (CT) and no-till (NT)) at 5 rates of AW (0 t ha-1, 2 t ha-1, 4 t ha-1, 6 t ha-1 and 8t ha-1) were studied. Soil pH, organic matter content (OM), total nitrogen (TN), exchangeable bases, cation exchange capacity (CEC), available phosphorus (AP) and grain yield of cowpea were measured after harvest in the first and second year. Conventional tillage significantly reduced OM, Ca2+, Mg2+ and AP of the soil. Abattoir waste increased soil properties measured progressively with increase in its rate for both CT and NT plots. Although CT had a higher percentage increase than NT for pH, OM and TN (28.4%, 59.5% and 73.9% respectively). While NT had higher percentage increase than CT for CEC and AP (50.9% and 68.3%). Conventional tillage at 8 t ha-1 AW had the highest significant cowpea yield (2878 kg ha-1 and 2060 kg ha-1 for year 1 and 2 respectively). Abattoir waste applied at 8 t ha-1 can be effectively used for tropical soils under conventional tillage for increase in yield and sustainable agriculture.