Effects of Biuret Content of Urea in Soil and Foliar Application on Dwaif Indica Rice Cultivar IR 8

Foliar and soil application of urea containing 0, 0.3, 0.6, 0.9, 1.2 and 1.5 per cent biuret contamination were studied on dwarf indica rice IR 8 at U. P. Institute of Agricultural Sciences in a field trial during 1968. Variations in biuret content of urea applied as a basal dressing did not bring about a statistically significant change in grain yield even up to the highest level of 1.5 per cent. However, rice appears to be very sensitive to biuret in Joliar spray. A negative linear regression of grain yield on level of biuret was highly significant. No interaction between levels of biuret in urea applied through soil and foliage was observed.