Investigating lodging in spearmint with overhead sprinklers compared to drag hoses using entropy values from low altitude RGB-imagery  

作　　者：Behnaz Molaei Abhilash Chandel R.Troy Peters Lav R.Khot Juan Quiros Vargas 

机构地区：[1]Center for Precision and Automated Agricultural Systems,Department of Biological Systems Engineering,Washington State University,24106 North Bunn Road,Prosser,WA 99350,USA [2]Institute of Bio-and Geosciences,Plant Sciences(IBG-2),Forschungszentrum Julich GmbH,52428 Julich,Germany

出　　处：《Information Processing in Agriculture》2022年第2期335-341,共7页农业信息处理（英文）

摘　　要：Lodging occurs when the crop canopy is too heavy for the strength of the stem and it fallsover onto the ground. This decreases crop yield and quality, and it makes harvest difficult.A research experiment was set up in a spearmint field on a center pivot with mid elevationspray application (MESA) overhead sprinklers, where the water was applied from a “midelevation” of 2 m above the ground level (AGL), and low elevation precision application(LEPA) sprinklers, where the water was emitted directly onto the soil surface through draghoses without wetting the crop canopy. Every-other span of this full-size center pivot wasconfigured with MESA and LEPA sprinklers alternatively. In 2018, imagery was collectedwith an unmanned aerial vehicle (UAV) from a cross section of this field. In 2019, a crosssection was again collected, but in addition UAV imagery was collected from marked lodgedand un-lodged areas of the field to validate the lodging detection method. These UAV-basedimagery data were captured with a ground sample distance (GSD) of 0.03 m. This researchintroduces using the texture feature, which is based on image entropy, was used to evaluate the degree of lodging. The results from 2018 showed that the average entropy of thegrayscale image from LEPA (5.5 (mean) ± 0.27 (standard deviation)) was significantly(P < 0.0001) greater than the average entropy (5.0 ± 0.25) of MESA. Also, the entropy valueextracted from the images in 2019 from the marked un-lodged locations were significantlyhigher compared to that of the lodged areas. Overall, the LEPA irrigation treatment was significantly less lodged compared to MESA. Moreover, the entropy value, or texture feature, isa viable method for estimating lodging using low altitude RGB imagery.

关 键 词：LODGING Spearmint Entropy value Texture feature LEPA and MESA irrigation systems 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]