Evaluation of riser spacing in sprinkler irrigation for groundnut

Bheemaiah G.; Chari A. V.

Investigations were carried out to find out the effect of sprinkler riser spacing on groundnut crop at water use laboratory, College Farm, Rajendranagar, Hyderabad [India] during summer 1972. Among the three riser spacings of 12 m., 15 m. and 18 m., higher application efficiency (61.75%), pattern efficiency (62.10%) and co-efficient of uniformity (71.40%) was recorded with 12 m, riser spacing with more average catch depth of water compared to 15 m. and 18 m. riser spacings. Efficiency was least in 18 m. riser spacing. Under the three spacings studied the pod yield of groundnut was significantly higher (19.23 q/ha) with 12 m. riser spacing followed by 15 m. (16.25 q/ha) and 18 m. (11.66 q/ha) riser spacings. The co-efficient of variation in yield was high (32%) in 18 m. spacing and it was less in 15 m. (27%) and 12 m. spacings (25%). The water use efficiency was significantly higher with closer spacing of 12 m. (2.99 kg. pods/mm.) and was less in 18 m. (2.38 kg. pods/mm.) riser spacing.