Effect of iron, zinc and manganese levels on yield and yield attributing characters of rice

In a field experiment with 3 levels of Zinc (Zn) 0, 5 and 10 kg ha⁻¹, 3 levels of Iron (Fe) 0, 15 and 30 kg ha⁻¹ and 3 levels of Manganese (Mn) 0, 5 and 10 kg ha⁻¹ on rice it was found that zinc @ 10 kg ha⁻¹, iron 15 kg ha⁻¹ and manganese 5 kg ha⁻¹ produced highest number of panicles/m², filled spikelets (grains)/panicle, maximum panicle weight, panicle length, grain filling percentage, test weight, and grain and straw yields. Individually Zn, Fe and Mn registered 12.05, 8.60 and 4.46% more yield respectively over control. Furthermore Zn @ 10 kg ha⁻¹ was found to interact significantly with Mn @ 5 kg ha⁻¹ and Fe @ 15 kg ha⁻¹ in producing higher grain yield. Mn and Fe also interacted significantly and registered maximum increase in straw yield.