Vol. 7, Issue 2 (2019)
Indigenous nutrient supply and nutrient requirement of rice in reclaimed alkali soils
Author(s): Dr. S Ravichandran and S Saravanakumar
Abstract: Field experiments were conducted during samba (September-February) season of 2004 and 2005 in alkali soils with pH 8.6 and ESP 16 with amendments like gypsum @50% GR or distillery spentwash (DSW)@ 5 lakh litres /ha. By adopting the recommended DSW technology for the reclamation of alkali soils ie., one month time gap after application and leaching with good quality water, DSW apart from reclaiming alkali soils also recorded significantly higher rice grain yield of 6.58 Mg /ha over gypsum @50%GR. In moderately alkali soils (pH <8.7 and ESP<20) growing alkali tolerant rice cultivars viz, TRY-1 or BPT5204 recorded average rice yield of 5.87 Mg/ ha. The total factor productivity and partial factor productivity for N, P and K of rice increased by reclamation of alkali soils either with DSW or gypsum @50%GR. Reclaiming alkali soils using gypsum @50%GR, improved the recovery efficiency of N and P and decreased the recovery efficiency of K. Reclaiming through DSW application recorded significantly higher N and Na uptake. Reclaiming alkali soil with gypsum increased the N and P requirement of rice to produce one tonne of grain while decreased K requirement. But DSW reclamation increased the N,P, and K requirement of rice. The nutrient requirement to produce one tonne of rice is higher in reclaimed alkali soils than normal soil. The indigenous nutrient supply viz., INS, IPS and IKS increased with DSW application while it is almost comparable with no amendment in gypsum reclaimed alkali soil.
How to cite this article:
Dr. S Ravichandran and S Saravanakumar. Indigenous nutrient supply and nutrient requirement of rice in reclaimed alkali soils. 2019; 7(2): 36-39.