Sodyum nitrat uygulamasının toprak havuzlardaki taban sedimentlerine etkileri

Bu çalışma toprak havuzlarda azot gübrelerinin, havuz taban toprağına potansiyel etkileri belirlemek amacıyla yapılmış ve toprak solunum çemberlerinin kullanıldığı laboratuvar çalışmalarıyla değerlendirilmiştir. Çalışma için dört ayrı toprak havuzun üst 5 cm’lik toprak tabakasından örnekler toplanmıştır. Sodyum nitrat uygulanmış her toprak segmentindeki mikrobiyel ayrışma bir solunum çemberi içerisinde ölçülmüştür. Çemberler 25°C de, karanlıkta kuluçka edilmiş ve 1, 2, 4, 8, 12, 16, 20, 24, 28, 32, 36, 46. günlerdeki solunumu ölçülmüştür. Sodyum nitrat uygulanmış ve uygulanmamış topraklar arasında toprak solunumları açısından istatistiki bir fark bulunamamıştır (p

Anahtar Kelimeler:

gölet, azotlu gübreler, sodyum nitrat, balık havuzu toprağı, çökelti

Effects of sodium nitrate enrichment on bottom sediments in earthen ponds

The potential influence of nitrogen fertilization on respiration of pond bottom soil was evaluated in laboratory studies using soil respiration chambers. Sample from the upper 5 cm sediment layer of four freshwater ponds were collected. Microbial decomposition of each soil segment was measured inside a respiration chamber inoculated with Sodium Nitrate. Chambers were incubated in the dark at 25°C and respiration was measured after 1, 2, 4, 8, 12, 16, 20, 24, 28, 32, 36, 46 days. No significant differences (p<0.05) in soil respiration was found among sodium nitrate treated and untreated soil. Soil respiration ranged between 6.55 mg CO2/g in sandy soil to 11.14 mg CO2/g in black soil.

Keywords:

ponds, nitrogen fertilizers, sodium nitrate, fish pond soils, sediment,

PDF

___

Avnimelech, Y., G. Zohar 1986. The effect of local anaerobic conditions on growth retardation in aquaculture systems. Aquaculture 58:167-174.

Boyd, C. E. 1985. Chemical budgets for channel catfish ponds. Transactions of the American Fisheries Society 114:291 -298.

Hutchinson, G. E. 1957. A Treatise on Limnology: Vol. 1. Geography, Physics, and Chemistry. John Wiley and Sons: New York.

Boyd, C. E. 1990. Water quality in ponds for aquaculture. Alabama Agricultural Experiment Station, Auburn University, Alabama.

Boyd, C. E., D. T. Coddington, 1994. Pond bottom soil respiration during fallow and culture Periods in heavily-fertilized tropical fish ponds. Journal of the World Aquaculture Society 25:417-423.

Boyd, C. E. 1994. Bottom soils, sedimet, and pond aquaculture. Chapman & Hall, New York.

Boyd, C. E., P. Munsiri, B. F. Hajek, 1995. Physical and chemical characteristics of bottom soil in ponds at Auburn, Alabama, USA and a proposed system for describing pond soil horizons. Journal of the World Aquaculture Society 26 (4): 346-377.

Masuda, K., C. E. Boyd, 1994. Phosphorus fractions in soil and water of aquaculture ponds built on clayey ultisols at Auburn, Alabama. Journal of the World Aquaculture Society 25:379-395.

Pavek, E. R. 1998. Effect of sodium nitrate enrichment on water quality variables, bottom sediments, and catfish production in earthen ponds. Master thesis. Auburn University, Auburn, Alabama, USA.

SPSS, 1997, SigmaStat Statstical Software, SPSS, Chicago.