EFFECT OF TILLAGE SYSTEM AND SEED RATES ON GROWTH AND YIELD OF DURUM WHEAT (Triticum durum) AND GROWTH OF ASSOCIATED WEEDS IN DRYLAND FARMING

Abstract

A field experiment was conducted during the growing season 2010-2011 at Namrood under supplementary irrigation and Al-koosh location under rainfall condition in Naniva province to evaluate tillage system (No till. Conventional till) under different seeding rates (100, 120, 140 kg / ha) to eliminate weed growth and to increase durm wheat var (Omm Rabie) yield Triticum durum L. However, the location was the third factor. The results showed that there was reduction in the number or dry weight of narrow 49.1 %.34.4 % respectively and broad leave weeds (57.9, 56.1 % respectively) in no till system when compared with conventional tillage but there was no difference between the two tillage system in wheat yield. In Al- Koosh location, there were reduction in the number and dry weight of grass weeds and dry weight of broad leave weeds when compared with Namrood location.Wheat yield was higher at Namrood as comparing with Al-Koosh (56.2 %) with difference between the two system up to 1952.8 kg / ha. On other hand, as seed rates had increased up to 140 kg/ha, the weed growth was low and the yield increased even if at 100 kg/ha seed rate. In general, the best result of crop yield at Namrood was with 100 kg/ ha seed rate under conventional tillage while at Al-Koosh location, Low yield had given in the con. Till differences between the two treatments reached up to 59.9 %.