TY  - JOUR
T1  - Responses of Sunflower Yield and Grain Filling Period to Plant Density and Weed Interference
AU - , M. Sedghi AU - , R. Seyed Sharifi AU - , A. Namvar AU - , T. Khandan-e-Bejandi AU - , P. Molaei 
JO  - Research Journal of Biological Sciences
VL  - 3
IS  - 9
SP  - 1048
EP  - 1053
PY  - 2008
DA  - 2001/08/19
SN  - 1815-8846
DO  - rjbsci.2008.1048.1053
UR  - https://makhillpublications.co/view-article.php?doi=rjbsci.2008.1048.1053
KW  - Density
KW  -grain filling
KW  -sunflower
KW  -weed interference
KW  -yield
AB  - In order to study the effects of plant density and weed interference on sunflower yield and its attributes and also to determine the response of grain filling period in sunflower to plant density and weed interference, a factorial experiment was carried out using randomized complete block design with 3 replicates at research site of university of Mohaghegh Ardabili. Treatment were three levels of plant density (6, 8 and 10 plant m <SUP>2</SUP> as D<SUB>1</SUB>, D<SUB>2</SUB> and D<SUB>3, </SUB>respectively) and 2 levels of weed control (weedy and weed free). Results indicated that plant density had significant effects on sunflower growth characteristics. The highest grain yield obtained from D<SUB>2</SUB>. The highest 1000-grain weight, grain per head, stem and head diameter, dry matter, yield per plant and harvest index recorded at D<SUB>1</SUB>, while D<SUB>3</SUB> showed the highest values of plant height and percentage of hollow grains. The levels of weed control did not affected sunflower yield and yield attributes significantly (except number of grain per head) that probably due to soil salinity, weed genus, planting row space, density and high tolerance of sunflower to weeds. The highest rate and duration of grain filling recorded at D<SUB>1</SUB> in both levels of weed treatments. Furthermore, D<SUB>1</SUB> showed the highest mean of final grain weight, that probably due to effects of density on light interception by canopy.
ER  -