5th
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1 2 Mert Acar1 Nurullah Acir3 Zeliha Bereket Barut4
1 2 3 4 --soya fasulyesi rotasyonundaki killi bir top
-10 cm, 10-20 cm ve 20-30 cm derinlikteki toprak lara -- -1 - - -30 cm derinlikte ise %73.3 -Anahtar Kelimeler: Fosfor
Variation of Chemical Soil Quality under Different Soil Tillage Systems
Abstract
Conservational tillage methods have been developed with the aim of sustaining agricultural production and preventing degradation caused by traditional methods. The purpose of this study was to investigate the effects of six different tillage methods applied for nine years on a clayey soil under Cukurova conditions on soil chemical quality (SCQ). SCQ indices provide information on availability of plant nutritions on crop growth. The field experiment was established 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 (ZT) treatment. pH, electrical conductivity (EC), sodium adsorption ratio (SAR), available phosphorus (P) and potassium (K) were determined for 0-10 cm, 10-20 cm and 20-30 cm depths of the soils sampled from experimental plots. The data were converted to unitless scores using non-linear scoring curves of soil management assessment framework developed by United States Department of Agriculture. The highest P score of the first 10 cm depth was found under NT and significantly decreased with the intensity of soil tillage. Electrical conductivity and partially K scores of three depths in all applications were scored as 1.0 which is the highest score. Tillage methods, only at
0-SCQ calculated by the arithmetic means of the individual indicators scores. The 0-SCQ function was ranged between 87.5% (CT-1) and 92.6% (NT) at depth of 0-10 cm, between 79.4% (NT) and 83.1% (RT-1) at 10-20 cm depth and 73.3% (HZT) to 77.9% (CT-2). The well mixing of surface soil with moldboard plow in the CT has caused less change of SCQ compared to conservational practices.
