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