Clay soil samples were collected using a shovel to a depth of more than two feet. Each sample was then placed in five sacks, each 20 cm deep and weighing 30 kg. This was carried out in the month of March, during a period of no rainfall and minimal weed growth, at Tsuanin Kura GRA Sabon Tasha, Kaduna South, Kaduna State. Maize seedlings (AS-SAMAD Agro Allied Co., PZ Kaduna State) were purchased from an agrochemical store in Kaduna Metropolis, Kaduna State, Nigeria. NPK 20:10:5 Matrix Fertilizer (KM 3 Dumbin Duste Zaria, Kaduna) was also obtained from an agrochemical store in Kaduna Metropolis. Rabbit manure was collected from a garden at Tsuanin Kura GRA. Calcium hydroxide, Sodium Hydroxide, thiourea, Nitric and Sulfuric acids were procured from chemical vendors along Kano Road, Kaduna Metropolis, Kaduna State, Nigeria.