Use of Abattoir Wastewater Compost as Organic Fertilizer for Rice Production on a Ultisol in Delta State, Nigeria

Abstract

The research was conducted to monitor the influent of abattoir wastewater compost on rice growth and yield in Benin-Owah River Basin in Illah, Delta State, Nigeria. The compost was applied at 0, 2.5, 5.0, 10 t/ha, and NPK15:15:15 at 250 kg/ha laid in randomized complete block design with four replicates. Rice seeds were sown for two years, and residual effects were evaluated in the third year. Rice plant height, stem circumference, and the number of tillers was measured at two weeks intervals while rice yields have taken at harvest. Soil samples were taken yearly to monitor nutrient changes. Data obtained were analyzed with analysis of variance and mean separated with Duncan Multiple Range Test at α0.05. In the first year, NPK15:15:15 significantly gave the highest dry matter (6.28±1.45 t/ha) and grain yield (2.4±0.53 t/ha). While in the second year, 10 t/ha treatment produced the dry matter (7.69±1.60 t/ha) and grain yield (2.6±0.53 t/ha). In a residual study, the highest grain yield (2.8±0.72 t/ha) was produced in the plot treated with 10 t/ha, and it also gave the highest pH, organic carbon, total nitrogen, and available P content. The compost at the rate of 10 t/ha can increase soil fertility and rice yield.

Macadamia Husk Compost Improved Physical and Chemical Properties of a Sandy Loam Soil

“…Application of MHC increased soil pH in the current study probably due to (i) the high pH of the compost used (Table 1), which is consistent with previous findings [18,19], and (ii) a similar increase in exchangeable cations as shown by positive correlations between exchangeable K, Na, Ca, Mg, and soil pH (Table 7). Consistent with our findings, Macil et al [64] attributed an increase in soil pH of both clay and loamy sand soils with the application of biochar to high ash content and pH of the biochar, and Ojobor et al [38] concluded that application of rice husk compost increased soil pH due to the exchangeable Ca, Na, and K contained in the compost.…”

“…Organic matter is a source of nutrients and microbial activity in the soil, and it affects water holding capacity, soil structure, infiltration rate, soil aeration, and soil porosity [33,34]. The increase in SOC with the addition of compost, including MHC, to the soil has been reported previously and this was attributed to the high organic carbon in the compost [19,35,36] and an increase in the rate of carbon sequestration [14,37,38]. In the current study, the increase in soil organic carbon with compost application was likely due to the high C of the macadamia husk compost (Table 1), which is consistent with recent findings that carbon inputs from compost resulted in greater SOC at lower soil depths [15].…”

Effects of abattoir wastewater on the growth of <i>Solanum lycopersicum</i> L. (tomato)

“…The findings suggest that these organic nutrients jointly improve soil fertility and increase stem girth (Tsige et al, 2022). This result is also similar to the findings of Ojobor and Egbuchua (2020)…”