Mapping crop evapotranspiration with high-resolution imagery and meteorological data: insights into sustainable agriculture in Prince Edward Island

Frontiers in Remote Sensing

Remote Sensing

Farhat Abbas¹  Bishnu Acharya²  Qamar Zaman³  Travis Esau³  Hassan Afzaal⁴  Fatima Imtiaz⁵  Xander Wang⁵  Aitazaz Farooque⁶ 

[1] College of Engineering Technology, University of Doha for Science and Technology, Doha, Qatar;College of Engineering, University of Saskatchewan, Saskatoon, SK, Canada;Department of Engineering, Faculty of Agriculture, Dalhousie University, Truro, NS, Canada;Faculty of Sustainable Design Engineering, University of Prince Edward Island, Charlottetown, PE, Canada;School of Climate Change and Adaptation, University of Prince Edward Island, Charlottetown, PE, Canada;School of Climate Change and Adaptation, University of Prince Edward Island, Charlottetown, PE, Canada;Faculty of Sustainable Design Engineering, University of Prince Edward Island, Charlottetown, PE, Canada;

关键词: crop evapotranspiration;    irrigation scheduling;    high-resolution imagery;    sustainable agriculture;    soil and water conservation;   

DOI  :  10.3389/frsen.2023.1274019

 received in 2023-08-07, accepted in 2023-09-29,  发布年份 2023

来源: Frontiers

【 摘 要 】

Soil moisture variability caused by soil erosion, weather extremes, and spatial variations in soil health is a limiting factor for crop growth and productivity. Crop evapotranspiration (ET) is significant for irrigation water management systems. The variability in crop water requirements at various growth stages is a common concern at a global level. In Canada’s Prince Edward Island (PEI), where agriculture is particularly prominent, this concern is predominantly evident. The island’s most prominent business, agriculture, finds it challenging to predict agricultural water needs due to shifting climate extremes, weather patterns, and precipitation patterns. Thus, accurate estimations for irrigation water requirements are essential for water conservation and precision farming. This work used a satellite-based normalized difference vegetation index (NDVI) technique to simulate the crop coefficient (Kc) and crop evapotranspiration (ETc) for field-scale potato cultivation at various crop growth stages for the growing seasons of 2021 and 2022. The standard FAO Penman–Monteith equation was used to estimate the reference evapotranspiration (ETr) using weather data from the nearest weather stations. The findings showed a statistically significant (p < 0.05) positive association between NDVI and tabulated Kc values extracted from all three satellites (Landsat 8, Sentinel-2A, and Planet) for the 2021 season. However, the correlation weakened in the subsequent year, particularly for Sentinel-2A and Planet data, while the association with Landsat 8 data became statistically insignificant (p > 0.05). Sentinel-2A outperformed Landsat 8 and Planet overall. The Kc values peaked at the halfway stage, fell before the maturity period, and were at their lowest at the start of the season. A similar pattern was observed for ETc (mm/day), which peaked at midseason and decreased with each developmental stage of the potato crop. Similar trends were observed for ETc (mm/day), which peaked at the mid-stage with mean values of 4.0 (2021) and 3.7 (2022), was the lowest in the initial phase with mean values of 1.8 (2021) and 1.5 (2022), and grew with each developmental stage of the potato crop. The study’s ET maps show how agricultural water use varies throughout a growing season. Farmers in Prince Edward Island may find the applied technique helpful in creating sustainable growth plans at different phases of crop development. Integrating high-resolution imagery with soil health, yield mapping, and crop growth parameters can help develop a decision support system to tailor sustainable management practices to improve profit margins, crop yield, and quality.

【 授权许可】

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Copyright © 2023 Imtiaz, Farooque, Wang, Abbas, Afzaal, Esau, Acharya and Zaman.