Effects of Different Nutrition Systems (Organic, Chemical and Integrated) and Biofertilizer on Yield and Other Growth Traits of Sunflower (Helianthus annuus L.)

In order to study the effects of different nutrition systems (organic, chemical, integrated) and biofertilizer (PGPR) on grain yield and its component in Sunflower (Helianthus annuus L.) an experiment was conducted using Alestar cultivar at the Research Farm of College of Agriculture, Tarbiat Modares University in 2007. Five levels of nutrition systems including F1 (100% organic), F2 (75% organic+25% chemical), F3 (50% organic+50% chemical), F4 (25% organic+75% chemicaL), F5 (100% chemical) in main plot and two levels of biofertilizer I1 (inoculation) and I00 (control) as subplot were used in a split plot arranged as a randomized complete block design with three replications. Results showed that different nutrition systems and biofertilizer significantly affected grain yield, oil percent and yield, protein percent, 1000 grain weight, number of grains per head and head diameter. The results revealed that the highest 1000 seed weight, number of grains per head and head diameter occur in integrated system F3 (50% organic+ 50% chemical). The grain yield in integrated system was more than organic and chemical systems. Seed inoculants with PGPR (I1) showed an increase in grain yield and yield components as campered to the control (without PGPR). The result reveals that yield and yield components produce better results during the combination of PGPR and integrated system than using either method alone. The highest yield (2890Kg/ha-1) was obtained using combination of PGPR with 50% organic + 50% chemical treatment (F3 I1).