RELATIONSHIP BETWEEN NORMALIZED DIFFERENCE VEGETATION INDEX AND GREEN CANOPY COVER IN LEGUMINOUS CROPS

A. Vozhehova, P. Lykhovyd, S. Lavrenko
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Abstract

The article presents the results of a study on the relationship and the possibility of mutual conversion between the normalized differentiated vegetation index (NDVI) and fractional green canopy cover (FGCC) in legumes. The purpose of the work is to provide proposals for models of mutual conversion between the vegetation indices. Materials and methods. The basis of the study was formed by the photographic materials of the leguminous crops, taken at different phases of growth and development on the fixed sites every 10 m of the experimental fields, obtained and automatically calculated to establish the percentage of green canopy cover in Canopeo mobile application. Experimental materials were obtained in 2021 in the experimental fields of the Institute of Irrigated Agriculture of NAAS and in 2016 in the experimental field of the AC "Radyanska Zemlya". Subsequently, the geotags and dates of shooting photographic materials were tied to the satellite NDVI values ​​obtained through the OneSoil AI platform for each of the studied crops (the difference in dates is up to 3 days). The established pairs of FGCC and NDVI for each crop were submitted for statistical analysis by polynomial regression. Statistical calculations and graphical work were performed in Microsoft Excel 365 spreadsheets. Results. It has been established that there is a close linear and nonlinear relationship between the FGCC and NDVI indices of the studied crops. The strength of the relationship is high, with a correlation coefficient in the range of 0.95-0.98 and a determination coefficient of 0.90-0.97. Polynomials of the second stage (nonlinear regression models) can be successfully used for mutual conversion between vegetation indices; the error in recalculation for most crops did not exceed 10 %. Conclusions. A high affinity between the normalized differential vegetation index and the percentage of green canopy cover in the leguminous crops (R2 within 0.90-0.97) has been proven. The closest relationship is observed for soybeans and beans compared to chickpeas and peas. Key words: peas, common beans, conversion, chickpeas, regression analysis, soybean.
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豆科作物归一化差异植被指数与绿色冠层覆盖的关系
本文介绍了豆科植物归一化分化植被指数(NDVI)与绿色冠层覆盖度(FGCC)之间的关系及其相互转换可能性的研究结果。本文的目的是为植被指数之间相互转换的模型提供建议。材料和方法。研究的基础是通过在试验田每隔10 m的固定地点拍摄豆科作物生长发育不同阶段的摄影资料,获取并自动计算建立Canopeo移动应用程序中的绿色冠层覆盖百分比。实验材料于2021年在NAAS灌溉农业研究所的实验田获得,并于2016年在AC“Radyanska Zemlya”实验田获得。随后,将拍摄照片材料的地理标签和日期与通过OneSoil人工智能平台获得的每种研究作物的卫星NDVI值绑定(日期差异可达3天)。每个作物的FGCC和NDVI的建立对通过多项式回归进行统计分析。统计计算和图形工作在Microsoft Excel 365电子表格中进行。结果。结果表明,研究作物的FGCC与NDVI指数之间存在着密切的线性和非线性关系。相关性强,相关系数为0.95 ~ 0.98,决定系数为0.90 ~ 0.97。第二阶段的多项式(非线性回归模型)可以成功地用于植被指数之间的相互转换;大多数作物的重新计算误差不超过10%。结论。结果表明,归一化植被指数与豆科作物林冠绿盖度呈高度亲和关系(R2在0.90 ~ 0.97之间)。与鹰嘴豆和豌豆相比,大豆和豆类的关系最为密切。关键词:豌豆,普通豆,转化,鹰嘴豆,回归分析,大豆。
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