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A satellite-based ex post analysis of water management in a blueberry orchard
(2020)
Eduardo Holzapfel
;
Mario Lillo-Saavedra
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RIVERA SALAZAR, DIEGO ANDRÉS
;
Viviana Gavilán
;
Angel García-Pedrero
1Scopus© Citations 6 2
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Early Estimation of Tomato Yield by Decision Tree Ensembles
(2022)
Mario Lillo-Saavedra
;
Alberto Espinoza-Salgado
;
Angel García-Pedrero
;
Camilo Souto
;
Eduardo Holzapfel
Crop yield forecasting allows farmers to make decisions in advance to improve farm management and logistics during and after harvest. In this sense, crop yield potential maps are an asset for farmers making decisions about farm management and planning. Although scientific efforts have been made to determine crop yields from in situ information and through remote sensing, most studies are limited to evaluating data from a single date just before harvest. This has a direct negative impact on the quality and predictability of these estimates, especially for logistics. This study proposes a methodology for the early prediction of tomato yield using decision tree ensembles, vegetation spectral indices, and shape factors from images captured by multispectral sensors on board an unmanned aerial vehicle (UAV) during different phenological stages of crop development. With the predictive model developed and based on the collection of training characteristics for 6 weeks before harvest, the tomato yield was estimated for a 0.4 ha plot, obtaining an error rate of 9.28%.
1Scopus© Citations 8 1
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Multiperiod Optimisation of Irrigated Crops under Different Conditions of Water Availability
(2018)
Mathias Kuschel-Otárola
;
Diego Rivera Salazar
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Eduardo Holzapfel
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PALMA INFANTE, CRISTIAN DERECK
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GODOY FAUNDEZ, ALEX ORIEL
We propose a nonlinear optimisation model which maximises profits by resource allocation on a monthly time scale, considering a monthly crop yield model. The proposed model was applied to six management scenarios (two seasonal and four monthly), nine conditions of water availability, and two situations of resource availability under Chilean conditions. These situations provided the same seasonal amount of resources, but different distributions over time. The model included improvements in water resource management such as water storage and water transactions, being the latter a monthly decision variable that can increase farmers’ profits. According to our results, monthly scenarios gave high profits, even better with appropriate resource distribution. When water costs are high, water transactions allow loss reduction of up to 50%. Regarding labour, the lack of availability is more critical than the wages.
31Scopus© Citations 8
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Simulation of Water-Use Efficiency of Crops under Different Irrigation Strategies
(2020)
Mathias Kuschel-Otárola
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RIVERA SALAZAR, DIEGO ANDRÉS
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Eduardo Holzapfel
;
Niels Schütze
;
Patricio Neumann
<jats:p>Irrigation management is a key factor in attaining optimal yields, as different irrigation strategies lead to different yields even when using the same amount of water or under the same weather conditions. Our research aimed to simulate the water-use efficiency (WUE) of crops considering different irrigation strategies in the Central Valley of Chile. By means of AquaCrop-OS, we simulated expected yields for combinations of crops (maize, sugar beet, wheat), soil (clay loam, loam, silty clay loam, and silty loam), and bulk density. Thus, we tested four watering strategies: rainfed, soil moisture-based irrigation, irrigation with a fixed interval every 1, 3, 5, and 7 days, and an algorithm for optimal irrigation scheduling under water supply constraints (GET-OPTIS). The results showed that an efficient irrigation strategy must account for soil and crop characteristics. Among the tested strategies, GET-OPTIS led to the best performance for crop yield, water use, water-use efficiency, and profit, followed by the soil moisture-based strategy. Thus, soil type has an important influence on the yield and performance of different irrigation strategies, as it provides a significant storage and buffer for plants, making it possible to produce “more crop per drop”. This work can serve as a methodological guide for simulating the water-use efficiency of crops and can be used alongside evidence from the field.</jats:p>
20Scopus© Citations 12

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