Monitoring of leaf nitrogen content in sugar beet by vegetation index values

Yıl 2020, Cilt: 8 Sayı: 1, 69 - 76, 24.06.2020

Mert Dedeoğlu

https://doi.org/10.33409/tbbbd.757448

Cited By: 1

Öz

Leaf nitrogen (N) content is one of the most important variables for agricultural applications due to its critical roles in photosynthesis and plant metabolism. In this study, it was aimed to relate the Redge -NDVI values derived from Sentinel 2A satellite images with the leaf N% contents in sugar beet plants for three different vegetation periods on a parcel basis. The study was carried out using leaf samples taken from 26 different farmers' lands selected in Konya-Çumra region between May-June-July 2019 and satellite images provided close to the specified dates. With the research, satisfactory accuracy coefficients (0.74 ≤ r2 ≤ 0.83) were obtained between leaf N contents and Redge - NDVI values during the vegetative and root development phase, but it was determined that the relationship decreased (r2 <0.70) during the sugar beet root growth period. As a result of the study, it was found successful to use Sentinel 2A satellite image and Red Edge spectral band in order to monitoring %N of sugar beet in early – mid vegetation periods rapidly and non-destructively in large areas and short time intervals. In addition, it has been suggested that by conducting similar studies can be provided valuable information to remote sensing applications that may increase the efficiency of nitrogen.

Anahtar Kelimeler

Nitrogen, red edge band, Sentinel-2, sugar beet, vegetation index

Vejetasyon indis değerleri ile şeker pancarı yaprak azot içeriğinin izlenmesi

Öz

Yaprak azot (N) içeriği fotosentez ve bitki metabolizmasındaki kritik rolleri nedeniyle tarımsal uygulamalar için en önemli değişkenlerdendir. Bu çalışmada Sentinel 2A uydu görüntülerinden türetilen Redge -NDVI değerleri ile üç farklı vejetasyon dönemi için şeker pancarı bitkisinde yaprak %N içeriklerinin parsel bazlı olarak ilişkilendirilmesi amaçlanmıştır. Çalışma Konya-Çumra bölgesinde seçilen 26 farklı çiftçi arazisinden Mayıs-Haziran-Temmuz 2019 tarihlerinde alınan yaprak örnekleri ve belirtilen tarihlere yakın temin edilen uydu görüntüleri kullanılarak yürütülmüştür. Araştırma ile vejetatif gelişim ve kök oluşum evresinde yaprak %N içerikleri ve Redge – NDVI değerleri arasında tatmin edici doğruluk katsayıları (0.74 ≤ r2 ≤ 0.83) elde edilmiş, ancak şeker pancarı kök büyüme dönemi içerisinde ilişkinin azaldığı (r2 <0.70) belirlenmiştir. Çalışma sonucu şeker pancarı bitkisinin erken-orta vejetasyon dönemlerinde %N içeriğinin hızlı ve tahribatsız olarak geniş alanlarda ve kısa zaman aralıklarında izlenmesi için Sentinel 2A uydu görüntüsü ve Red Edge spektral bandının kullanımı başarılı bulunmuştur. Ayrıca benzer araştırmaların yürütülmesi ile azot kullanım etkinliğini artırabilir uzaktan algılama uygulamalarına değerli bilgiler sağlanabileceği önerilmiştir.

Anahtar Kelimeler

Azot, red edge bant, Sentinel-2, şeker pancarı, vejetasyon indisi

Kaynakça

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