Competition studies in intercropping of wheat (Triticum aestivm), rapeseed (Brassica campeshis) and pea (Pisum sativum)

Abstract

A field experiment was conducted during winter (rabr) seasons of 1990-92 on intercropping of wheat (Triticum aestivum L. emend. Fiori & Paol.), rapeseed [Brassica campestris (L.) Czernj & Casson] and pea (Pisum sativum Poir.) at Jorhat. Results showed that wheat+rapeseed was the best combination for getting yield advantage in intercropping over wheat + pea and rapeseed+ pea as judged by wheat equivalent yield and various competitive functions like land-equivalent ratio and aggressivity. Among the proportions 1 : 1was found to be the most favourable. Yield advantage in wheat + pea and rapeseed+ pea combination was also observed except at 1 : 7 -- 3 sowing proportion. Either with wheat or rapeseed when the sowing proportion of pea was more than 50%, intercropping became disadvantageous.