5th
16
Mert Acar1 1 2 Zeliha Bereket Barut3 Nurullah Acir4
1 2 3 4 fiziksel 1), An --10 cm, 10-20 cm ve 20-le hesaplanan FTK 0- - - -20 cm derinlikte %50.3 - -2) ve 20- -
-Anahtar Kelimeler: Toprak
Can Conservational Soil Tillage Systems Reduce Physical Soil Quality?*
Abstract
Plant production can be potentially limited by physical soil conditions that reduce aeriation and water availability or increase mechanical resistance to root growth. This study was carried out to investigate the effects of tillage methods applied for nine
quality (SPQ). The field experiment was initiated in 2006 at Experimental and Research Station of Cukurova University with 3 replicates according to complete randomized block experimental design. The tillage treatments are: Conventional tillage with stubble (CT-1), Conventional tillage with stubbles burned (CT-2), Heavy disc harrow reduced tillage (RT-1), Rototiller reduced tillage (RT-2), Heavy disc harrow zero soil tillage (HZT), no-till tillage (ZT) treatment. Available water content (AWC), aggregate stability (AS), bulk density (BD), penetration resistance (PR) and water filled pore space (WFPS) were determined for 0-10 cm, 10-20 cm and 20-30 cm depths of the soils sampled from experimental plots. The data obtained were converted to unitless scores using soil management assessment framework of United States Department of Agriculture and soil health assessment of Cornell University. SPQ calculated by arithmetic means of individual indicators ranged from 51.0% (RT-2) to 60.3% (CT-2) in 0-10 cm, from 50.3% (RT-2) to 63.2% (CT-2) in 10-20 cm and from 50.2% (RT-2) to 60.6 (CT-2), respectively. Contrary to expectations, the physical quality function of soil under CT applications is higher than that under the RT and NT systems. The increase in SPQ under conventional practices is due to the high WFPS and PD scores and relatively higher BD and AWC scores obtained under CT applications. The most important improvement in the name of SPQ in RT and NT systems is high AS scores. However, since SPQ reflects the same amount of effect from individual indicators, the AS effect was not sufficient to change the general SQI.
