Spektral yansıma değerlerinin yem bezelyesinde (Pisum sativum) fosfor düzeylerinin belirlenmesi amacıyla kullanımı

Yıl 2012, Cilt: 25 Sayı: 1, 53 - 57, 01.06.2012

Y. Özyiğit M. Bilgen

Öz

Bu çalışmada bir baklagil yem bitkisi olan yem bezelyesindeki (Pisum sativum L.) fosfor
düzeylerinin spektral yansıma değerleri kullanarak belirlenmesi amaçlanmıştır. Çalışma hem
arazi koşullarında hem de sera koşullarında yürütülmüş ve sera uygulamaları için plastik
saksılar kullanılmıştır. Arazi ve sera koşullarında yetiştirilen bitkilerde hem genel (kanopi) hem
de yapraktan yansıma ölçümleri yapılmış ve ölçümler için 325-1075 nm dalga boyları arasında
yansıma ölçümü yapabilen taşınabilir bir spektroradyometre kullanılmıştır. Yansıma
ölçümlerinden sonra biçilen bitkiler 65°C‟de 48 saat kurutularak laboratuarda fosfor analizleri
yapılmıştır. Laboratuarda belirlenen fosfor düzeyleri ile spektral yansıma değerlerine değişken
ekleme ve eleme (stepwise) regresyon analizi uygulanmış ve fosfor düzeyleri ile ilişkili dalga
boyları belirlenerek regresyon eşitlikleri oluşturulmuştur. Elde edilen sonuçlara göre örneklerin
fosfor düzeyleri ile dalga boyu yansıma değerleri arasında önemli ilişkiler belirlenmiştir.
Özellikle yapraktan yapılan kontrollü ölçümlerde daha sağlıklı sonuçlar elde edilmiştir.
Çalışmadan elde edilen sonuçlar yem bezelyesindeki fosfor düzeylerinin tahmin edilmesinde
spektral yansıma değerlerinin kullanılabileceğini göstermektedir.

Anahtar Kelimeler

Yansıma değeri, Spektroradyometre, Fosfor düzeyi, Yem bitkisi, Yem bezelyesi

Use of spectral reflectance values to determine phosphorus levels in field pea (Pisum sativum)

Öz

The purpose of this study was to determine phosphorus levels in field pea (Pisum sativum L.) based on spectral reflectance values. The study was conducted under both field and greenhouse conditions. Plastic pots were used in greenhouse experiments. Both canopy and leaf measurements were performed in plants which grown in field and greenhouse. A portable spectroradiometer which can measure reflectance wavelength range of 325-1075 nm was used for reflectance measurements. After reflectance measurements, plants were cut and dried in air forced oven at 65°C for 48 h, and phosphorus analyses were carried out in laboratory. Stepwise regression analysis was performed to phosphorus levels determined in laboratory and spectral reflectance values and regression equations were constituted with wavelengths which related with phosphorus levels. According to the results, significant relationships were determined between phosphorus levels and wavelength reflectance values. Better results were obtained in controlled measurements performed in leaves. The results show that, spectral reflectance values can be used to predict phosphorus levels in field pea.

Anahtar Kelimeler

Reflectance value, Spectroradiometer, Phosphorus levels, Forage crops, Field pea

Kaynakça

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