Estimating Yield Components, Limiting Factors, and Yield Gaps of Enset in Ethiopia Using Easily Measurable Above-Ground Plant Traits

Zerihun Yemataw, Alemar Said, Tesfaye Dejene, Walter Ocimati, David Amwonya and Guy Blomme
Additional contact information
Zerihun Yemataw: Southern Agricultural Research Institute (SARI), Hawassa P.O. Box 06, Ethiopia
Alemar Said: Southern Agricultural Research Institute (SARI), Hawassa P.O. Box 06, Ethiopia
Tesfaye Dejene: Southern Agricultural Research Institute (SARI), Hawassa P.O. Box 06, Ethiopia
Walter Ocimati: Bioversity International, Kampala Office, Kampala P.O. Box 24384, Uganda
David Amwonya: International Institute for Tropical Agriculture, Kampala P.O. Box 7878, Uganda
Guy Blomme: Bioversity International, Addis Ababa Office, c/o ILRI, Addis Ababa P.O. Box 5689, Ethiopia

Sustainability, 2021, vol. 13, issue 23, 1-16

Abstract: The quantification of yield for different enset products has mainly been based on farmers’ estimates, which are often inaccurate. Several allometric models have been developed to overcome this challenge. Building on past work, the current study developed allometric models for enset fiber, kocho, and bula yield estimation. Enset yield limiting factors and associated yield gaps were also determined. In this study, above-ground growth and yield (kocho, bula, and fiber) traits of five-year-old plants of two widely grown enset landraces, ‘Unjame’ and ‘Siskela’, were assessed in farmers’ fields at three contrasting altitude sites. Except for bula, a minor yield component, correlation, and PCA analysis showed strong association between the above-ground and yield traits. Allometric equations based on the above-ground traits significantly (R 2 = 25 to 68%) explained the variation in the yield traits. This study, for the first time, generated allometric models that can reliably estimate enset fiber yield. Leaf length, petiole length, and plant height are especially good for estimating fiber and kocho yields. The performance of models for bula were poor possibly due to the very low bula yields per plant. Soil chemical characteristics differently influenced enset yield attributes. For example, improving K supply can potentially enhance fiber yield. Higher yield gaps were observed for bula, with P accounting for the highest yield gaps across yield traits. Through careful targeting, the different yield attributes can thus be enhanced. This and previous studies clearly show that non-destructive enset plant assessments can provide solid information for quick and easy yield assessments for various traits during e.g., agronomic, germplasm evaluation, soil fertility enhancement, and intercropping trials.

Keywords: allometric equations; bula; fiber; kocho; yield gaps (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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