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A field experiment, ‘Optimizing inter row spacing in sugarcane based intercropping systems in semi-arid regions of Karnataka were conducted during 2013-14 an d 2014-15 at KIAAR, Sameerwadi, Karnataka. The experiment consisted of 12 treatments in plant cane and 23 in ratoon cane. There were three row spacings i.e., 1.2 m, 2.4 m (paired row) and 3.6 m (paired row) and three intercrops (soy bean, green pea and drill sown onion) in plant cane and two intercrops (watermelon and cucumber) in ratoon cane. In the plant cane, a significantly higher number o f millable canes (NMC) (1,34,717 ha-1), cane yield (110 t ha-1) and CC S yield (14.9 t ha-1) at harvest were recorded in su garcane at 1.2 m row spacing than at 2.4 m or 3.6 m spacing. In the r atoon cane also, NMC (1,00,953 ha-1), cane yield (67 t ha-1) and CCS yield (7.8 t ha-1) were significantly higher at 1. 2 m row spacing compared to 2.4 m and 3.6 m row spaci ngs respectively. Sugarcane at 1.2 m + green pea and on ion were the best intercropping systems compared to o her intercropping systems in plant cane where as sugarca ne at 1.2 m + green pea followed by (fb) watermelon wa s the best intercropping system compared to others in ratoon c ane. In case of total productivity of both plant an d ratoon crops, sugarcane at 1.2 m + green pea fb ratoon + cucumber produced higher combined cane yield (187 t ha-1) wi th 9 q ha-1 of green pea and 44 q ha-1 of cucumber compared to oth er intercropping systems.

Optimizing Inter Row Spacing in Sugarcane Based Intercropping Systems in Semi-Arid Regions of Karnataka