the investigation of competition indices in intercropping of wheat (triticum aestivum l.) and chickpea (cicer arietinum l.) under nitrogen consumption

in order to investigate the competition indices of intercropping wheat and chickpea under nitrogen consumption, an experiment was arranged as factorial based on randomized complete block design with three replications during 2009 – 2010 in gonbad kavous university farm. planting patterns factor included four levels of sole cropping wheat (w), two rows of wheat with one row of chickpea (w2c1) one row of wheat with two rows of chickpea (w1c2) and sole cropping chickpea (c) and nitrogen consumption contained four levels of 0, 25, 50, 75 and 100 kg n/h per/ha. results showed that the highest grain yield and wheat equivalent yield was obtained from sole cropping of wheat. in the intercropping of two rows of wheat with one row of chickpea and one row of wheat with two rows of chickpea land equivalent ratio was 0.87 and 0.71 respectively that was less than sole cropping of wheat and cicer. relative crowding coefficient of wheat in two rows of wheat with one row of chickpea and one row of wheat with two rows of chickpea was 1.93 and 1.73 and of chickpea was 0.15 and 0.17 respectively. the aggressivity parameter indicated a tendency for wheat to dominate cicer in both intercropping. competitive ratio in two rows of wheat with one row of chickpea was greater than one row of wheat with two rows of chickpea. actual yield loss and intercropping advantage in wheat was positive and in cicer was negative. actual yield loss and intercropping advantage in intercropping of wheat and cicer was decreased.