EFFECT OF PLANT DENSITY AND FERTILIZATION LEVELS ON YIELD AND YIELD COMPONENTS OF SOME VARIETIES OF SUNFLOWER (Helianthus annuus L.) .

Abstract

This experiment was carried out in the experiments station of the agriculture college/ university of Diyala in the spring season of 2014 in 23/2/2014 . using a silty loam soil. Experiment have achieved on sunflower with a factorial experiment ، a split split plot randomized complete block design with three replications . This study included three factors ، first the NPK fertilizer with three levels (0، 150 ، 300) Kg/h-1 which are divided into two times first after 30 days when seeds germinated and the second after 35 days after the first . The second factor was the plants density with three levels ( 66666، 80000، 100000) plant/h-1 and the third factor three varieties of sunflower (shemoos ، Akmar and Euroflower ) ، and here it was the important results obtained: The highest density level (100000) plant/h-1 gave the highest results the characters studied which were ، head diameter ، yield ( ton / h-1 ) . Level of 150 Kg/ h-1 of NPK fertilizer was the best for head diameter and yield ( ton / h-1 ) . Shemoos variety exceeded other varieties in head diameter ، 1000 seed weight ، yield ( ton / h-1 ) and (seeds number in head-1 ) . The interaction ( Akmar variety X 150 Kg NPK / h-1 ) gave the highest values in head diameter. The interaction (Shemoos variety X 66666 plants per hector) gave significant differences in seeds number per head ، 1000 seeds weight ، yield ( ton / h-1 ) .The interaction (Shemoos variety X150 Kg NPK / h-1 X 100000 plants/ h-1 ) gave the highest significant results in seeds yield.