Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi
*Present address: Indian Institute of Horticultural Research, Upper Palace Orchards, Bangalore 560 006
Biuret concentration of 1 per cent and above (up to 4 per cent) in urea used in spray fertilization caused visible injuries to the foliage and markedly reduced the grain yield of wheat (var. Kalyansona) by 5 to 8 q/ha in comparison to biuret-free urea. The effect of 0.25 and 0.5 per cent biuret and of fertilizer urea (0.84% biuret) was practically of a similar order recording a mean decrease in grain production by 2 to 4 q/ha. An increase in the content of biuret from 1 to 4 per cent enhanced the straw yield. Significant depression in the percentage N composition of grain and straw was observed at biuret levels of 2 and 0.5 per cent, respectively. Increasing concentrations of biuret in urea progressively reduced the uptake of N by the crop
Biuret, foliar spray of urea, wheat yield and N composition
