Sumam Susan VargheseIndira, MAnnie KoruthJoseph, C AKAU2019-01-282019-01-281997Journal of Tropical Agriculture, 35(1), 23-25.http://krishikosh.egranth.ac.in/handle/1/5810092698A field trial was conducted for four seasons to evaluate the efficacy of ammonium polyphosphatc (APP) for its sequestering effect of /me and to find out the optimum level of zinc for the rice crop. The results revealed the sequestering effect of APP to /.inc. Among the three levels of zinc application tried, 25 kg ZnSO4 per ha was found to be the optimum level of zinc for the rice crop.ennullArticle