Intercropping is a suitable method towards sustainable agriculture and environmental conservation. Accordingly, in order to evaluate the effect of green bean additive intercropping on Cucurbita pepo yield, an experiment was carried out at the Agricultural Research Station of Bu-AIi Sina University, as a randomized complete block design (RCBD) with three replications. Treatments included sole cropping of Cucurbita pepo, additive intercropping of 25% green bean + Cucurbita pepo, additive intercropping of 50% green bean + Cucurbita pepo, additive intercropping of 75% green bean + Cucurbita pepo and additive intercropping of 100% green bean + Cucurbita pepo. Analysis of variance (ANOVA) showed that yield parameters of Cucurbita pepo included seed number fruit"1, fruit diameter, and fruit weight, as well as grain yield were affected significantly by experimental treatments. The highest values for seed number fruit'1 (288 seed fruit"1), fruit diameter (67 cm), fruit weight (2.93 kg) and seed yield (93 g m"2) were achieved at sole cropping of Cucurbita pepo. In all intercropping treatments indices of land equivalent ratio and competition index was >1 and <1, respectively. Additive intercropping of 75% green bean + Cucurbita pepo indicated that the highest land equivalent ratio (1.46). Therefore, this treatment increased land use efficiency and produced maximum total yield.
