Effects of Bulk Density and Drainage System on Infiltration

Abstract

In this study, the effects of subsurface drainage system and bulk density of surface layer on infiltration capacity were investigated in an alluvial soil (Typic Ustifluvent) of Tokat-Kazova Agriculture Enterprise. Using double-ring infiltrometers, infiltration capacities were measured at four distances from the drain line installed 3 years ago with average drain depth of 143 cm (0-, 4.75-, 18.75- and 37.5-m which is above drain line installed 25-35 years ago). Four measurements were performed for each distance. For bulk density determination of surface soils at the locations infiltration test performed, two undisturbed soil samples with 1-1.5-m forward and backward from the locations were taken. The results showed that the infiltration capacity was not much affected by the distances from the drain line, however, bulk density of surface layer affected the infiltration capacity with medium degree and negatively ( correlation coefficient r = -0.698, P < 0.003)

Keywords

• Drain spacing, drainage system, infiltration, bulk density

Hacim Ağırlığı ve Drenaj Sisteminin İnfiltrasyona Etkileri

Öz

Bu çalışmada alüvyal oluşumlu (Typic Ustifluvent) Tokat-Kazova Tarım İşletmesi arazisinde üç ve 25-35 yıl önce döşenmiş ortalama 1.43 m derinlikli toprakaltı drenaj sistemleri ile yüzey toprağına ait hacim ağırlığının infiltrasyon hızına etkileri araştırılmıştır. Çift silindir infiltrometreler kullanılarak, eski ve yeni dren hatları, bu hatların orta noktaları ve yeni hattan 4.75 metre mesafeli hat boyunca dörder adet infiltrasyon testleri yapılmıştır. Herbir test yerine ait yüzey toprağının hacim ağırlığının belirlenmesi için ise, test yerinin1-1.5 metre ileri ve gerisinden birer adet bozulmamış toprak örneği alınmıştır. Sonuçta, dren hatlarından mesafeye göre, toprakaltı drenajının infiltrasyonu fazla etkilemediği, fakat yüzey toprağının hacim ağırlığının infiltrasyonu orta derecede ve ters orantılı olarak (korelasyon katsayısı r = -0.698, P < 0.003) etkilediği bulunmuştur.

Anahtar Kelimeler

• Dren aralığı, drenaj sistemi, infiltrasyon, hacim ağırlığı

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