Evaluation of Soil Color and Soil Fertility Relations on Cultivated Semi-Arid Sloping Landscapes

Year 2023, , 19 - 25, 30.04.2023

Zeinab Abdi Djama , Seval Sünal Kavaklıgil , Sabit Erşahin

https://doi.org/10.55507/gopzfd.1213097

Abstract

Soil color is a critical property, providing important information on soil properties. Soil color highly spatially varies on cultivated semi-arid sloping landscapes, indicating differences in soil properties that affect soil fertility. This study evaluated the relationships between color variables (L*: soil brightness, a*: redness, and b*: yellowness) and some basic soil properties on air dry and wet (around field capacity) soil samples, in a semi-arid sloping landscape having been under wheat cultivation for a long time. The values of color variables and soil properties were graphed and relationships between them were modeled using most proper regression models. The soil properties were poorly related to values of a* and b*, while CaCO3, sand, clay, and K contents and EC were highly significantly correlated with values of L*-wet (L*-values obtained on moist soil samples). Soil EC and CaCO3 content can be safely predicted by L*-wet in the study area. Also, the L*-wet should be preferred over L*-dry in predicting soil properties from soil color components in the study area and similar soils.

Keywords

Soil color, Soil fertility, Soil water content, semi-arid sloping landscapes

Ekili Yarı-Kurak Eğimli Bir Arazide Toprak Rengi ve Toprak Verimliliği Arasındaki İlişkinin Değerlendirilmesi

Abstract

Toprak rengi, toprak özellikleri hakkında önemli bilgiler sağlayan kritik bir özelliktir. Toprak rengi, ekili yarı kurak eğimli arazilerde mekansal olarak oldukça değişkendir ve bu, toprak verimliliğini etkileyen toprak özelliklerindeki farklılıkları gösterir. Bu çalışmada uzun süredir buğday ekimi yapılan yarı kurak eğimli bir arazide hava kuru ve ıslak (tarla kapasitesi civarında) toprak örneklerinde renk değişkenleri (L*: toprak parlaklığı, a*: kırmızılık ve b*: sarılık) ile bazı temel toprak özellikleri arasındaki ilişkileri değerlendirilmiştir. Renk değişkenlerinin değerleri ve toprak özellikleri grafik haline getirilmiş ve aralarındaki ilişkiler en uygun regresyon modelleri kullanılarak modellenmiştir. Toprak özellikleri a* ve b* değerleriyle zayıf bir şekilde ilişkiliyken, CaCO3, kum, kil ve K içerikleri ve EC, L*-wet (nemli toprak numunelerinde elde edilen L* değerleri) değerleriyle yüksek oranda anlamlı bir şekilde ilişkili çıkmıştır. Toprak EC ve CaCO3 içeriği, çalışma alanındaki L*-wet ile güvenle tahmin edilebilir. Ayrıca, çalışma alanındaki toprak rengi bileşenlerinden ve benzer topraklardan toprak özelliklerinin tahmin edilmesinde L*-wet, L*-dry yerine tercih edilmelidir.

Keywords

Toprak rengi, Toprak verimliliği, Toprak su içeriği, yarı kurak eğimli alanlar

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