Real-time nitrogen management in aerobic rice by adopting leaf color chart (LCC) as influenced by silicon uri icon

abstract

  • Leaf color chart (LCC) guides fertilizer nitrogen (N) application to rice as per requirement of the crop on the basis of a critical leaf color. Two field experiments were conducted to evaluate the effect of silicon (Si) and LCC based N management in aerobic rice. Following LCC-based N management, from 60 to 90kg N ha(-1) and 75 to 100kg N ha(-1) with 10-40% and 25-30% less fertilizer N was used without any reduction in yield as compared to the package of practices of 100 (50kg N ha(-1) as basal + two split of 25kg N ha(-1)) kg N ha(-1) respectively, during both the seasons. The highest grain yield was noticed with 90kg N ha(-1) (30kg N ha(-1) as basal + LCC-3) and 100kg N ha(-1) (50kg N ha(-1) as basal + two split of 25kg N ha(-1)) along with the application of calcium silicate (CaSiO3) at 2t ha(-1) as sources of Si and on par with 60kg N ha(-1) (no basal + LCC-3) and 75kg N ha(-1) (30kg N ha(-1) as basal + LCC-3), respectively, during the season in 2008 and 2009. Higher fertilizer N use efficiency was recorded with Si and need-based N management using LCC-3 rather than recommended dose of fertilizer N.

publication date

  • 2017
  • 2017
  • 2017