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Exploring optimal farm resources management strategy for Quncho-teff (Eragrostis tef (Zucc.) Trotter) using AquaCrop model

Author

Listed:
  • Haileselassie, Hailay
  • Araya, A.
  • Habtu, Solomon
  • Meles, Kiros Gebretsadkan
  • Gebru, Girmay
  • Kisekka, Isaya
  • Girma, Atkilt
  • Hadgu, Kiros Meles
  • Foster, A.J.

Abstract

Teff is a major staple food crop in Ethiopia. Moisture and soil fertility are the two major factors limiting teff yield. Studies were conducted across three sites in Ethiopa [Mekelle (MK) in 2012 and 2016, Ilala (IL) in 2012 and Debrezeit (DZ) in 2009 and 2010]. The objectives of these studies were (1) to assess the response of Quncho-teff to different fertilizer and irrigation levels; 2) to quantify irrigation water productivity (IWP), and (3) to collect data to calibrate and validate AquaCrop model for simulating yield and evaluate optimal irrigation and sowing date strategy for Quncho-teff at different locations in Ethiopia. The different fertilizer levels were: 1) 64kgN and 46kg P/ha (N2P2); 2); 32kgN and 23kg P/ha (N1P1); 3) 0kgN and 0kg P/ha (N0P0) and 4) 52kgN and 46kg P/ha (N3P3). The four irrigation treatments were: zero (rainfed), two, four and full irrigation applications. Findings showed that full irrigation in combination with high fertilizer (N2P2) could give better yield. However, during abnormal rainfall, spreading the available fertilizer at a rate of 32kgN and 23kg P/ha may be preferable to applying 64kgN and 46kg P/ha. This study also indicated that the regional fertilizer recommendations for teff need to be revised taking in to account the soil characteristics, climate and irrigation water availability. The AquaCrop model was able to simulate the observed canopy cover, soil water, biomass and yield of teff satisfactorily. Canopy cover was simulated with normalized root mean square error (NRMSE), index of agreement (I) and R2 of 7%, 0.5 and 0.8, respectively. Soil moisture during the season was simulated with NRMSE of 11.4–15.7%, I of 0.99 and R2 of 0.85–0.9. Simulated final aboveground biomass values were in close agreement with the measured (NRMSE, 7.8%, I, 0.89 and R2, 0.66). There was also good agreement between simulated and measured grain yield with NRMSE, I and R2 values of 10.9%, 0.93, 0.80, respectively. Scenario analysis indicated that early sowing was the best option to maximize teff yield with the least amount of irrigation. Scenario analysis also showed that one irrigation during flowering stage could substantially improve irrigation water productivity (IWP) of teff and minimize the yield loses which could occur due to shifting of sowing date from early to normal. Two irrigation applications also substantially improved the yield and IWP of late sown teff. However, to get high yield, a late sown teff should receive at least four irrigation applications during the mid-growth stage of the crop. These results suggest that AquaCrop model can be used to identify optimal farm resource management strategies for teff production.

Suggested Citation

  • Haileselassie, Hailay & Araya, A. & Habtu, Solomon & Meles, Kiros Gebretsadkan & Gebru, Girmay & Kisekka, Isaya & Girma, Atkilt & Hadgu, Kiros Meles & Foster, A.J., 2016. "Exploring optimal farm resources management strategy for Quncho-teff (Eragrostis tef (Zucc.) Trotter) using AquaCrop model," Agricultural Water Management, Elsevier, vol. 178(C), pages 148-158.
    • Handle: RePEc:eee:agiwat:v:178:y:2016:i:c:p:148-158
    DOI: 10.1016/j.agwat.2016.09.002
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    References listed on IDEAS

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    1. Araya, A. & Stroosnijder, Leo & Girmay, G. & Keesstra, S.D., 2011. "Crop coefficient, yield response to water stress and water productivity of teff (Eragrostis tef (Zucc.)," Agricultural Water Management, Elsevier, vol. 98(5), pages 775-783, March.
    2. Araya, A. & Habtu, Solomon & Hadgu, Kiros Meles & Kebede, Afewerk & Dejene, Taddese, 2010. "Test of AquaCrop model in simulating biomass and yield of water deficient and irrigated barley (Hordeum vulgare)," Agricultural Water Management, Elsevier, vol. 97(11), pages 1838-1846, November.
    3. Tsegay, Alemtsehay & Vanuytrecht, Eline & Abrha, Berhanu & Deckers, Jozef & Gebrehiwot, Kindeya & Raes, Dirk, 2015. "Sowing and irrigation strategies for improving rainfed tef (Eragrostis tef (Zucc.) Trotter) production in the water scarce Tigray region, Ethiopia," Agricultural Water Management, Elsevier, vol. 150(C), pages 81-91.
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    1. Mihretie, Fekremariam Asargew & Tsunekawa, Atsushi & Haregeweyn, Nigussie & Adgo, Enyew & Tsubo, Mitsuru & Masunaga, Tsugiyuki & Meshesha, Derege Tsegaye & Ebabu, Kindiye & Nigussie, Zerihun & Sato, S, 2022. "Exploring teff yield variability related with farm management and soil property in contrasting agro-ecologies in Ethiopia," Agricultural Systems, Elsevier, vol. 196(C).

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