The effects of various organic wastes applied into eroded soil on dehydrogenase enzyme activity

Abstract

It is known that, organic wastes added to soil improve many soil properties. Bio-solid (BIO), tea production wastes (TEW) and tobacco production Wastes (TOW) are some organic wastes used for this target. The objective of our study was to find out the effects of these organic matter sources On dehydrogenase enzyme activity (DHA) in different levels of eroded soils. To determine different soil erosion levels (slightly, moderately and severely), erosion ratio (ER) and structural stability index (SSI) parameters were Used. ER values of slightly, moderately and severely eroded soils were determined as 5.36, 6.65 and 12.17 while their SSI values were determined 78.3, 77.8. and 68.7 respectively. Vertic calciudoll samples used in this research were taken from surface (0 to 20 cm depth) located oil agricultural areas of Samsun, Northern Turkey. This area has been used as agricultural activity for a long time. This study was conducted by applying four different doses of BIO, TEW and TOW (0, 2, 4 and 6 %, basis dry weight) into eroded soils under greenhouse condition. Each treatment was replicated three times in a split block design. After eighteen weeks incubation period, DHA was determined in all pots. According to analysis results, relation between erosion level and DHA were found as negative. TEM and TOW were increased DHA values in all erosion levels contrast to itself control application. The effects of different organic wastes oil DHA were increasing depended oil application dose. Additionally, BIO application was increased DHA with 2 % doses whereas it was decreasing DHA with 4 % and 6 % doses. These results were found statistically significant at P<0.001.