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Effectiveness of crop-waste compost on a Eutric Ferralsol
- Amoding, Alice, Stephen Tenywa, John, Ledin, Stig, Otabbong, Erasmus
- Zeitschrift für Pflanzenernährung und Bodenkunde 2011 v.174 no.3 pp. 430-436
- Zea mays, compost quality, corn, crops, fertilizer rates, grain yield, leaf area index, markets, municipal solid waste, nitrogen, nitrogen content, nutrient utilization, phosphorus fertilizers, pollution, risk, soil fertility, Uganda
- Lack of environmentally safe handling of garbage is a growing problem in urban sub-Saharan Africa (SSA). Composting the garbage for soil-fertility management presents an opportunity for reducing the risks of environmental pollution. This study aimed at evaluating the agronomic effectiveness and nutrient-utilization efficiency of urban market crop-waste compost on a Eutric Ferralsol. The study was conducted in central Uganda with treatments including compost applied at 0, 5, and 10 t ha⁻¹ (d.w. basis); inorganic N fertilizer at rates of 0, 40, and 80 kg ha⁻¹ and inorganic P fertilizer at 0, 9, and 18 kg ha⁻¹. Maize (Zea mays L.), variety Longe 4 was used as the test crop. The nutrient quality of the compost was medium with total N of 0.9% and total P of 0.45%. Compost significantly increased plant height, LAI, stover weight, and grain yield; however, there were no significant differences between the 5 and 10 t ha⁻¹ rates. Nitrogen also had a significant effect on LAI and stover yield, though there was no significant difference between the 40 and 80 kg ha⁻¹ rates. Likewise, P increased plant height with no significant difference between the 9 and 18 kg ha⁻¹ rates. Mineral N at 40 kg ha⁻¹ led to the highest increase in N uptake by plants (76%) above the control. Nitrogen- and P-utilization efficiencies for the 5 t ha⁻¹ compost rate were more than twice that of the 10 t ha⁻¹ rate. The highest P-utilization efficiency (69%) was obtained where 9 kg ha⁻¹ P was applied with 40 kg ha⁻¹ N, while the highest N-utilization efficiency (48%) was obtained with the 5 t ha⁻¹ compost applied together with N at 40 kg ha⁻¹. From the above studies, it is clear that effectiveness of the 5 t ha⁻¹ compost rate is the most promising.