Spatial Variation of DTPA Extractable Iron, Copper, Zinc and Manganese Concentrations in Suluova and Merzifon Plain Soils

Öz

Appropriate plant nutrient management is important for achieving high crop yield and protecting environmental quality. The aims of this study are; i.) to determine the DTPA extractable micronutrient concentrations in Suluova and Merzifon Plains, ii.) to understand the relationship between micronutrients and related soil properties affecting the availability of micronutrients, and iii.) to figure out the spatial structure of micronutrients. Seventy-Six soil samples from Merzifon and 143 samples from Suluova Plain were collected to measure available zinc (Zn), iron (Fe), cupper (Cu) and manganese (Mn) concentrations along with soil clay, silt and sand contents, pH, electrical conductivity (EC), calcium carbonate and organic matter contents. Descriptive results showed that Zn and Fe deficiencies were widespread throughout the study area while soils had sufficient amount of Cu and Mn. Mean Zn and Fe concentrations in Merzifon Plain were respectively 0.28 mg kg-1 and 2.0 mg kg-1 and 0.28 mg kg-1 and 3.26 mg kg-1 for Suluova Plain, respectively. Soil Zn and Mn concentrations had positive and pH and Zn had negative statistically important relations (P<0.01). In general, Zn concentrations were inadequate level at high pH locations whereas adequate Zn concentrations were obtained at locations where soil pH is between 7.20 to 8.00. Available Fe had positive correlations with Cu and Mn concentrations whereas statistically important negative correlations were obtained with sand content. Iron in Merzifon Plain and Fe, Zn and Cu in Suluova Plain had strong spatial dependency, while other micronutrients showed moderate spatial dependency. The range values obtained in geostatistical modeling should be taken into consideration as the minimum sampling distance for the future studies in the study area.

Anahtar Kelimeler

• Mapping
• geostatistics
• spatial dependency
• micronutrient

Suluova ve Merzifon Ovaları Topraklarının Yarayışlı Demir, Bakır, Çinko ve Mangan Konsantrasyonlarının Mesafeye Bağlı Değişimi

Öz

Bitki besin elementlerinin doğru amenajmanı, yüksek ürün elde etme ve çevresel kalitenin korunmasında oldukça önemlidir. Bu çalışmanın amaçları; Suluova ve Merzifon Ovaları topraklarının DTPA'da ekstrakte edilebilir mikro element konsantrasyonlarını belirlemek, bu mikro elementlerin yarayışlılığına etki eden diğer toprak özellikleri ile ilişkisini anlamak ve mikro elementlerin mesafeye bağlı yapısını ortaya koymaktır. Merzifon ovasından 76 ve Suluova ovasından 143 adet toprak örneği alınmış ve yarayışlı çinko (Zn), demir (Fe), bakır (Cu) ve mangan (Mn) konsantrasyonları ile toprak kil, silt ve kum içerikleri, pH, elektriksel iletkenlik (EC), kalsiyum karbonat ve organik madde içerikleri belirlenmiştir. Tanımlayıcı istatistik sonuçları çalışma alanının büyük bir kısmının Zn ve Fe açısından yetersiz, ancak Mn ve Cu bakımından toprakların yeterli olduğunu göstermiştir. Ortalama Zn ve Fe konsantrasyonları Merzifon ovasında sırasıyla 0.28 mg kg-1 ve 2.0 mg kg-1 ve Suluova ovasında ise 0.28 mg kg-1 ve 3.26 mg kg-1'dır. Toprakların Zn konsantrasyonu istatistiksel olarak Mn ile pozitif ve pH ile negatif önemli korelasyonlar (P<0.01) göstermiştir. Genelde pH'nın yüksek olduğu yerlerde Zn yetersizliği görülürken, pH' nın 7.30-8.00 arasında olduğu bir kısım alanlarda Zn' nun bitkiler için yeterli düzeyde olduğu belirlenmiştir. Yarayışlı Fe, Cu ve Mn ile pozitif korelasyonlara sahip iken, kum içeriği ile negatif korelasyon göstermiştir. Merzifon ovasında Fe, Suluova ovasında ise Fe, Zn ve Cu' ın mesafeye bağımlılığının yüksek olduğu belirlenmiştir. Diğer mikro elementlerin ise orta düzeyde mesafeye bağımlılık gösterdiği tespit edilmiştir. Jeoistatistiksel modellemede elde edilen range değerleri, çalışma alanında ilgili özelliğin örneklenmesinde minimum mesafe olarak alınmalıdır.

Anahtar Kelimeler

• Haritalama
• jeoistatistik
• mesafeye bağımlılık
• mikroelement
• Mapping
• geostatistics
• spatial dependency
• micronutrient

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