Yield of upland rice cultivated under sprinkler irrigation as a function of row spacing and seed density

Plant development, plant phenology, yield components and grain yield of upl and rice, cv. IAC 201, submitted to three different row spacings (30, 40 an d 50 cm) and densities (100, 150 and 200 viable seeds/m(2)) were studied. T he experiment was set under field conditions in a Dark-Red Latosol, loamy t exture, in Selviria, MS, Brazil, under sprinkler irrigation conditions with water replacement tension of -0.070 MPa. The number of stalks and panicles per area increased with row spacing reduction; density of 100 viable seeds /m(2) is more indicated for IAC 201 cultivated under sprinkler irrigation c onditions, because seed spend is smaller; row spacing of 30 cm allowed the maximum grain yield.