تأثير الزراعة الحافظة و المخففة في بعض الخصائص الفيزيائية للتربة اللومية الطينية و إنتاجية الشعير في ظروف منطقة الاستقرار الثالثة في سورية

الملخص EN

The experiment was conducted at Salamia Agricultural Research Center in Hama Governorate, on a clay loam soil during 2009/ 2010 and 2010/ 2011 seasons, to evaluate the speed and till number including conservation agriculture (no till), on some soil physical properties and barley yield, using CRBD design.

Increasing the front wheel speed of the tractor from 5.07 to 7.71 Km hr-1 and the till number to 2, reduced soil bulk density, penetration resistance, and mean weigh diameter, while saturated hydraulic conductivity was increased.

Increasing the front wheel speed of the tractor to 10.22 Km hr-1, increased bulk density, and penetration resistance, and reduced saturated hydraulic conductivity, which had negative effect on barley yield planted after vetch.

The treatment tilled twice at medium speed (7.71 km.

hr-1) followed by conservative agriculture producing the highest barley yield, where the biological yield reached (4253 and 3727) kg.ha-1 during the first season, and (5964 and 5744) kg.ha-1 during the second season respectively.

Conservative agriculture was superior over tilled treatments, in attaining the lowest penetration resistance, and the highest saturated hydraulic conductivity by the end of the growing season.

Generally, conservative agriculture contributed in improving soil physical properties and barley yield.

Therefore, its application is recommended under targeted environmental conditions