evaluation of sowing patterns and weed control on mung bean (vigna radiate l. wilczek) - black cumin (nigella sativa l.) intercropping system

in order to study different arrangements and weed controls effects on mung bean (vigna radiate l. wilczek) – black cumin (nigella sativa l.) intercropping an experiment was conducted at the research station of faculty of agriculture, ferdowsi university of mashhad, iran, during growing season 2005 – 2006. sixteen treatments comprising combinations of eight sowing patterns [a1: sole black cumin, a2: sole mung bean, a3: 3 rows black cumin– 2 rows mung bean, a4: 3 rows black cumin – 2 rows mung bean, a5: 2 rows black cumin – 1 rows mung bean, a6: 1 row black cumin – 2 rows mung bean, a7: 3 rows black cumin – 3 rows mung bean (striped), a8: 1 row black cumin – 1 row mung bean (alternative rows)] and two weed controls [v1: unweeded, v2: completely hand weeding] were arranged in a factorial experiment based on randomized complete block design with three replications. results showed that in intercropping systems leaf area index (lai) of mung bean reduced but in the case of black cumin increased. mung bean total dry matter in intercropping system did not differ comparing with sole crop but total dry matter in black cumin increased. all yield components in both crops affected by sowing patterns and weed control treatments. number of branches/plant, number of pods or follicules/plant and number of seed/pods or follicules increased in a8, a4, a5 and a3 sowing patterns in mung bean and a3, a5 and a7 sowing patterns in black cumin compared with other arrangements. by increasing mung bean ratio in rows, the number of weed species, weed density, dry weight of weeds and abundance of weed species decreased. in unweeded treatment, number of branches/plant, number of pods or follicules/plant and number of seed/pods or follicules decreased in both crops. land equivalent ratio (ler) was more than 1.00 in all sowing patterns.