Abstract
To sustain food security and crop condition monitoring, yield estimation must improve at local and global scales. The aim of this review was to give a background of satellite-based crop monitoring and crop yield estimation, including the use of crop models. Recently, most advances in remote sensing techniques, aimed at complimenting the traditional crop harvest surveys, have focused on high-production and information-rich areas. However, there is limited research in dynamic landscapes using these techniques at local scales in most Southern African countries. Models such as the Decision Support System Agro-Technology’s (DSSAT) CERES-model, and Agricultural Production Simulator (APSIM) have been used to simulate maize biophysical parameters and yield variability in a changing climate. Despite the successes, there is still need to consider yield prediction using simplified models that decision-makers can use to plan for food support and sales. The application of freely-available satellite data with focus on maize crop as a staple for Southern Africa, highlights some challenges such as heavy reliance on agro-meteorological estimations and regional estimations of crop yield. It also raises questions of predicting across large growing belts without consideration of diverse cropping patterns. Conversely, future opportunities in crop monitoring and yield estimation using remotely sensed-data still shed a light of hope. For instance, employing multi-model configurations or multi-model ensembles is one of the major missing gaps needing consideration by crop modeling research. Other simpler, but versatile opportunities are the use of crop –monitoring applications on smart phones by small holder farmers to provide phenological data to decision makers throughout a growing season.
Highlights
Crop condition monitoring and yield estimations must continuously produce timely, and spatially dependable updates for decision support systems
This review aims at enlighting the information on use of satellite derived biophysical parameters in crop monitoring and crop yield estimations with relations to crop models, with particular interest in Southern Africa, where food insecurity is worsening in a changing climate
Satellite-based crop yield predictions employ similar approaches centered on spectral signatures and the estimated yields can be as reliable as actual yields
Summary
Crop condition monitoring and yield estimations must continuously produce timely, and spatially dependable updates for decision support systems. As unfavorable climatic events continue hampering agriculture, consistent crop monitoring and yield estimation will form an imperative basis of management and increased global resilience With this information, relevant stakeholders can make timely and more accurate decisions during disasters and surplus production. Innovations of state-of-the-art satellite missions have taken an impressive turn over the decades resulting in remarkable contributions to precision agriculture (Biffis & Chavez, 2017) and cross-cutting sectors such as ecosystem services, health, soil mapping and socio-economic development (Bellora et al, 2017; Erickson, 1984; Shepande, 2010; Ferencz et al, 2004) The results of these undertakings, such as soil mapping and delineation of agroecological regions, are useful in decision-making and policy directions on resource management (Chapoto et al, 2016; Burke & Lobell, 2017). This review aims at enlighting the information on use of satellite derived biophysical parameters in crop monitoring and crop yield estimations with relations to crop models, with particular interest in Southern Africa, where food insecurity is worsening in a changing climate
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