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Potential of the APSIM model to simulate impacts of shading on maize productivity

Dilla, A, Smethurst, PJ, Barry, K ORCID: 0000-0003-2297-7931, Parsons, D ORCID: 0000-0002-1393-8431 and Denboba, M 2017 , 'Potential of the APSIM model to simulate impacts of shading on maize productivity' , Agroforestry Systems , pp. 1-11 , doi: 10.1007/s10457-017-0119-0.

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Abstract

A number of agroforestry models havebeen developed to simulate growth outcomes based onthe interactions between components of agroforestrysystems. A major component of this interaction is theimpact of shade from trees on crop growth and yield.Capability in the agricultural production systemssimulator (APSIM) model to simulate the impacts ofshading on crop performance could be particularlyuseful, as the model is already widely used to simulateagricultural crop production. To quantify and simulatethe impacts of shading on maize performance withouttrees, a field experiment was conducted at MelkassaAgricultural Research Centre, Ethiopia. The treatmentscontained three levels of shading intensity that reduced incident radiation by 0 (control), 50 and 75%using shade cloth. Data from a similar field experimentat Machakos Research Station, Kenya, with 0, 25 and50% shading were also used for simulation. APSIMadequately simulated maize grain yield (r2 = 0.97)and total above-ground biomass (r2 = 0.95) in thecontrol and in the 50% treatments at Melkassa, andlikewise in the control (r2 = 0.99), 25% (r2 = 0.90)and 50% (r2 = 0.98) treatments at Machakos. Similarly,APSIM effectively predicted Leaf Area Indexattained at the flowering (r2 = 0.90) and maturity(r2 = 0.94) stages. However, APSIM under-estimatedmaize biomass and yield at 75% shading. In conclusion,the model can be reliably employed to simulatemaize productivity in agroforestry systems with up to50% shading, but caution is required at higher levels ofshading.

Item Type: Article
Authors/Creators:Dilla, A and Smethurst, PJ and Barry, K and Parsons, D and Denboba, M
Keywords: APSIM, maize, crop modelling
Journal or Publication Title: Agroforestry Systems
Publisher: Kluwer Academic Publ
ISSN: 0167-4366
DOI / ID Number: 10.1007/s10457-017-0119-0
Copyright Information:

Copyright 2017 Springer Science+Business Media B.V.

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