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The feasibility of hand-held thermal and UAV-based multispectral imaging for canopy water status assessment and yield prediction of irrigated African eggplant (Solanum aethopicum L)
Agricultural Water Management ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.agwat.2020.106584
Paul Reuben Mwinuka , Boniface P. Mbilinyi , Winfred B. Mbungu , Sixbert K. Mourice , H.F. Mahoo , Petra Schmitter

Abstract This study was conducted to evaluate the feasibility of a mobile phone-based thermal and UAV-based multispectral imaging to assess the irrigation performance of African eggplant. The study used a randomized block design (RBD) with sub-plots being irrigated at 100% (I100), 80% (I80) and 60% (I60) of the calculated crop water requirements using drip. The leaf moisture content was monitored at different soil moisture conditions at early, vegetative and full vegetative stages. The results showed that, the crop water stress index (CWSI) derived from the mobile phone-based thermal images is sensitive to leaf moisture content (LMC) in I80 and I60 at all vegetative stages. The UAV-derived Normalized Difference Vegetation Index (NDVI) and Optimized Soil Adjusted Vegetation Index (OSAVI) correlated with LMC at the vegetative and full vegetative stages for all three irrigation treatments. In cases where eggplant is irrigated under normal conditions, the use of NDVI or OSAVI at full vegetative stages will be able to predict eggplant yields. In cases where, eggplant is grown under deficit irrigation, CWSI can be used at vegetative or full vegetative stages next to NDVI or OSAVI depending on available resources.

中文翻译:

手持热和基于无人机的多光谱成像用于灌溉非洲茄子(Solanum aethopicum L)冠层水分状况评估和产量预测的可行性

摘要 本研究旨在评估基于手机的热成像和基于无人机的多光谱成像评估非洲茄子灌溉性能的可行性。该研究使用随机区组设计 (RBD),其中子地块使用滴灌计算的作物需水量的 100% (I100)、80% (I80) 和 60% (I60) 进行灌溉。在早期、营养和全营养阶段,在不同土壤水分条件下监测叶片含水量。结果表明,基于手机的热图像得出的作物水分胁迫指数(CWSI)对I80和I60所有营养阶段的叶片水分含量(LMC)敏感。无人机衍生的归一化差异植被指数 (NDVI) 和优化土壤调整植被指数 (OSAVI) 在所有三种灌溉处理的营养和完全营养阶段与 LMC 相关。在正常条件下灌溉茄子的情况下,在完全营养阶段使用 NDVI 或 OSAVI 将能够预测茄子产量。如果茄子在亏缺灌溉下生长,根据可用资源,CWSI 可以在 NDVI 或 OSAVI 旁边的营养或完全营养阶段使用。
更新日期:2021-02-01
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