engleski

Influence of tillage systems on soil erosion by water on stagnosol in Central Croatia

In all four trial years, the highest soil loss by erosion was recorded in the control-standard treatment after USLE involving ploughed but bare soil. The losses were several times higher than tolerant erosion (T values), estimated at 10 t/ha/year (Schwertmann et al. 1987 ; Bašić, 1992): in the first year � 146.3 t/ha, in the second year � 110.11 t/ha, in the third year � 86.7 t/ha and 54.1 in four year of investigation. In the treatment with up-down the slope ploughing a soil loss of 38.5 t/ha was recorded in maize, 38.1 t/ha in soybean, 0.54 t/ha in winter wheat and 0.40 t/ha in oil rape production. In the no-tillage treatment, erosion loss was lower than in up-down the slope ploughing, but in maize still twice as high as tolerant� 22.8 t/ha, in soybean (13.5 t/ha) it exceeded the tolerant T value, while it was insignificant in winter wheat and oil rape (0.22 respectively 0.34 t/ha). Conventional across the slope ploughing was more efficient in terms of soil protection from erosion in all the crops grown, except maize: 11.6 t/ha, in soybean 5.3 t/ha, in winter wheat and oil rape insignificant 0.074 respectively 0.13 t/ha. Very deep across the slope ploughing resulted in a loss of 21.12 t/ha in maize, 5.2 t/ha in soybean, and 0.305 t/ha in winter wheat respectively 0.17 t/ha in oil rape production. Subsoiling with across the slope ploughing rendered the best results in stopping erosional processes: a soil loss of 2.9 t/ha was recorded in maize and soybean while insignificant 0.132 and 0.08 t/ha in winter wheat respectively oil rape.

erosion by water; USLE; tillage systems; erosional drift; pseudogley

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