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Optimizing Soil Fertility Management Strategies to Enhance Banana Production in Volcanic Soils of the Northern Highlands, Tanzania

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Department of Earth and Environmental Sciences, Division of Soil and Water Management, KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium
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Department of Sustainable Agriculture, Biodiversity and Ecosystems Management, Nelson Mandela African Institution of Science and Technology, Arusha P. O. Box 447, Tanzania
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Department of Water and Environmental Sciences, Nelson Mandela African Institution of Science and Technology, Arusha P. O. Box 447, Tanzania
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International Institute of Tropical Agriculture, Nelson Mandela African Institution of Science and Technology, Arusha P. O. Box 447, Tanzania
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Department of Biosystems, Division Plant Biotechnics, KU Leuven, W. De Croylaan 42, 3001 Heverlee, Belgium
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Author to whom correspondence should be addressed.
Agronomy 2020, 10(2), 289; https://doi.org/10.3390/agronomy10020289
Received: 13 December 2019 / Accepted: 31 January 2020 / Published: 18 February 2020
Banana is an important crop in high altitude areas of Tanzania, grown widely both as a food staple and as the main source of income. However, its production is constrained by low soil fertility, a result of gradual nutrient mining by the crop. Currently, soil fertility management in banana-based farming systems in the country relies mainly on applications of animal manure. However, the amount of manure produced in most farms is not enough to replenish soil fertility due to the small number of animals kept by smallholder resource-poor farmers who are the major producers in the country. Field experiments were conducted at three sites with varying soil types and contrasting weather conditions along the altitudinal gradients on the slopes of the volcanic mountains of Kilimanjaro and Meru, northern Tanzania to (1) investigate the effect of mineral nitrogen (mineral N) fertilizer applications on the growth and yield of Mchare banana (Musa spp., AA, a traditional East African highland cooking banana sub-group), at the four levels of 0, 77, 153, and 230 kg N ha−1 year−1 as a starter strategy to improve the current soil fertility management strategies, and (2) evaluate the effect of the combined use of inorganic and organic N sources on growth and banana fruit production as an alternative strategy to manage soil fertility and minimize animal manure requirements. The treatment factors were trial sites (Tarakea, Lyamungo, and Tengeru) as the main factor and N fertilization strategies (as urea alone, sole cattle manure, and in combination with urea, sole common bean (Phaseolus vulgaris L.) haulms as well as in combination with urea) as a sub factor. Bean haulms and cattle manure were applied each year for two years. Fertilization at 153 kg N ha−1 year−1 derived solely from urea significantly (p < 0.001) resulted in high yield increment of up to 42% relative to the control. However, the increase was highest (52%) with the same N dose derived from cattle manure in combination with urea at 50% substitution. Sole bean haulms resulted in a smaller yield increment, the same as the lowest N dose from the sole urea fertilization treatment. The study concludes that soil fertility management in smallholder banana-based farming systems should not solely rely on animal manure and mineral fertilizers. View Full-Text
Keywords: East African highland banana; fertilizer efficiency; integrated soil fertility management; Mchare banana; Musa spp.; Tanzania East African highland banana; fertilizer efficiency; integrated soil fertility management; Mchare banana; Musa spp.; Tanzania
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I. Meya, A.; A. Ndakidemi, P.; Mtei, K.M.; Swennen, R.; Merckx, R. Optimizing Soil Fertility Management Strategies to Enhance Banana Production in Volcanic Soils of the Northern Highlands, Tanzania. Agronomy 2020, 10, 289.

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