TY  - JOUR
AU  - Mirshekari, Bahram
TI  - Yield and harvest  index of sunflower (Helianthus  annus) grown by a monocultur system in competition  with redroot pigweed (Amaranthus retroflexus)
JO  - Agroecology Journal
VL  - 6
IS  - 1
SP  - 73
EP  - 88
PY  - 2010
DO  - 
ER  -