Evaluation of mustard (Brassica compestris Var. Toria) and legume intercropping under 1 : 1 and 2 : 1 row-replacement series systems

Field experiments were conducted at Agricultural Experimental Farm, Giridih , Bihar during the winter seasons of 1992-93 and 1993-94 to compare 1:1 and 2:1 row-replacement series intercropping of mustard (Brassica campestris V ar. Toria) with pea (Pisum sativum), with lentil (Lens culinaris) and with gram (Cicer areitinum L.). Intercropping systems were assessed on the basis of new indices termed 'actual yield loss' (AYL) and 'intercropping advanta ge' (IA), as well as several existing intercropping indices such as LER, RC C and aggressivity. Intercropping reduced the yield of component crops, com pared with respective pure stands. Mustard + pea in 1:1 row-replacement ser ies gave the highest mustard yield equivalent value(1.00 t/ha). When the ac tual sown proportion was considered, mustard+lentil (1:1) resulted in maxim um AYL (+0.438) and IA (+2.889) values. We conclude that AYL and IA are mor e appropriate, particularly when per plant yield is considered.