The effect of tillage systems during the summer season of 2013 did not differ significantly due to studied soybean traits. During the winter season of 2013/2014, the results showed that, CA tillage system increased significantly all the studied wheat traits as compared with the other tillage systems | Annals of Agricultural Science 2015 60 1 105 112 H O S T E D BY Faculty of Agriculture Ain Shams University Annals of Agricultural Science locate aoas Studies on conservation agriculture in Egypt . Harb . Abd El-Hay . Hager . Abou El-Enin Agronomy Dep. Fac. of Agric. Al-Azhar Univ. Cairo Egypt Received 14 April 2015 accepted 18 April 2015 Available online 16 May 2015 KEYWORDS Abstract Four field experiments were carried out at Gemmieza Agricultural Experimental CA Research Station AL-Gharbia Governorate during the four seasons of winter 2012 2013 summer CT 2013 winter 2013 2014 and summer 2014 under exhausted clay soil condition to study the effect of SCA three different tillage systems conventional tillage CT conservation agriculture CA and semi- NPK CA SCA and two levels of NPK fertilizers 100 of the recommended doses of NPK and 1 2 Wheat recommended doses of it on yield and its components of wheat Gemmeiza-9 variety and soybean Soybean Giza-111 variety through maize wheat soybean wheat soybean M W S W S cropping sys- Yield tem. Results revealed that during the winter season of 2012 2013 all studied wheat traits and gross energy kcal kg significantly were increased by feeding 100 of the recommended doses of NPK fertilizer compared by adding the half NPK doses. The effect of tillage systems during the summer season of 2013 did not differ significantly due to studied soybean traits. During the winter season of 2013 2014 the results showed that CA tillage system increased significantly all the studied wheat traits as compared with the other tillage systems. Referring to the summer season of 2014 CA system scored significant high values for the studied soybean traits. As for the effect of studied NPK fertilizer levels results indicated that 100 of the recommended doses of NPK favored the values of the studied soybean and wheat traits significantly during sum- mer 2013 and winter 2013 2014 as compared by 50 of the recommended dose of NPK .
