Effect of acidified biochar applications on DTPA extractable microelement content in a coarse textured soil

Öz

Since the biochars obtained by gasification process generally have alkaline character, their application to soils containing high lime content adversely affects availability of plant nutrients. This study was carried out to investigate the effects of original (alkaline) and acidified biochar applications on pH, EC and DTPA extractable micro element content in a calcareous sandy loam soil. In the incubation experiment, original (BpH9.4) and acidified biochars (BpH6.5 and BpH3.6) at different pH levels were used. Biochars were mixed into the soil at four different doses (0%, 1%, 2% and 4%) and incubated at 20-24°C. Soil samples were taken on the 30th and 90th days of the incubation experiment carried out at the moisture level at the field capacity. It was determined that the pH and EC values of the soils increased as the incubation period increased. The highest increase in soil pH was observed in the BpH9.4 application (0.46 units) compared to the control, and the highest decrease was observed in the BpH3.6 (0.19 units) application. Generally, BpH9.4 application decreased the soil EC value, while BpH6.5 and BpH3.6 applications increased it. The greatest increase in EC over the control was determined in the BpH3.6 application (342%). As the incubation period increased, the pH, EC and DTPA extractable Fe content of the soils increased, while the Cu, Mn and Zn contents decreased. In BpH3.6 application, DTPA extractable Fe (49%), Mn (43%) and Zn (16%) contents increased, and, DTPA extractable Cu content (19%) increased in BpH6.5 application compared to the control.

Anahtar Kelimeler

• Biochar
• acidification
• sandy soil
• lime
• incubation
• micronutrient

Asitleştirilmiş biyoçar uygulamalarının kaba bünyeli bir toprakta DTPA ile ekstrakte edilebilir mikro element içeriğine etkisi

Öz

Gazlaştırma işlemiyle elde edilen biyoçarlar genellikle alkali karaktere sahip olduklarından yüksek kireç içeren topraklara uygulanması bitki besin elementlerinin yarayışlılığını olumsuz etkilemektedir. Bu çalışma ile kumlu tınlı bünyeye sahip kireçli bir toprağa orijinal (alkali) ve asitle modifiye edilmiş biyoçar uygulamalarının toprakta pH, EC ve DTPA ile ekstrakte edilebilir mikro element içeriğine etkileri araştırılmıştır. İnkübasyon denemesinde orijinal (BpH9.4) ve farklı pH düzeylerinde asitleştirilmiş biyoçarlar (BpH6.5 ve BpH3.6) kullanılmıştır. Biyoçarlar dört farklı dozda (%0, %1, %2 ve %4) toprağa karıştırılarak 20-24oC’de inkübasyona bırakılmıştır. Tarla kapasitesi nem düzeyinde yürütülen inkübasyon denemesinin 30. ve 90. gününde toprak örneklemeleri yapılmıştır. Inkübasyon süresi uzadıkça toprakların pH ve EC değerlerinin arttığı belirlenmiştir. Toprak pH’sındaki en fazla artış kontrole kıyasla BpH9.4 uygulamasında (0.46 birim), en fazla azalış ise BpH3.6 (0.19 birim) uygulamasında olmuştur. Genel olarak BpH9.4 uygulaması toprak EC değerini azaltırken, BpH6.5 ve BpH3.6 uygulamaları artırmıştır. Kontrole kıyasla EC değerindeki en fazla artış BpH3.6 uygulamasında (%342) belirlenmiştir. İnkübasyon süresi uzadıkça toprakların pH, EC ve DTPA ile ekstrakte edilebilir Fe içeriği artarken, Cu, Mn ve Zn içerikleri azalmıştır. BpH3.6 uygulamasında DTPA ile ekstrakte edilebilir Fe (%49), Mn (%43) ve Zn (%16) içerikleri, BpH6.5 uygulamasında ise DTPA ile ekstrakte edilebilir Cu içeriği (%19) kontrole kıyasla artmıştır.

Anahtar Kelimeler

• Biyoçar
• Asitleştirme
• Kumlu toprak
• Kireç
• İnkübasyon
• Mikro element

Kaynakça

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