Studying the Relationship Between some Spectral Evidence and the Nutritional Elements of Citrus Orchards in Baqubah

Abstract

This study was conducted in three citrus or chord sites (Buhirz, Al-Huwaider, Khan al-Lawalwa) in Baqubah, Diyala, Iraq. The aim of this study to find out the type of relationship between each of Normalized Difference Vegetation Index (NDVI) and Soil Adjusted Vegetation Index (SAVI)with nutritional elements. Two sites (Al-Huwaider, Khan al-Lawalwa) were merged to be one site because of the adjacent borders of them Satellite imagery from the (Landsat 8) satellite was captured on 3/7/2022, including the study sites. The study sites were then extracted from the satellite imagery using the ARCgis pro software, and the sample locations were determined, maps were drawn, and spectral evidence values (NDVI, SAVI) were extracted for the purpose of completing the study. Laboratory analyses were conducted on citrus plant leaves taken from the study sites, and the major elements (NPK) were measured. The results show that the determination coefficient (R2) was hash between each of NDVI and SAVI, and nutrients concentration roles, using graphical points in Excel. It was concluded that the determination coefficient for the relationship between the spectral indices and nutrient concentrations is also high, indicating a correlation between the indices and nutrient levels in citrus tree leaves. From these results, it is possible to predict any point in the study sites where there is a deficiency of these nutrients.