Dr. V.R.BhattRAJANI KUMARI2017-05-182017-05-182012http://krishikosh.egranth.ac.in/handle/1/5810011369A pot experiment entitled “Effect of humic acid and its sources in combination with and without zinc on yield and chemical composition of maize” was carried out at the Dept. of Soil Science and Agricultural Chemistry, BACA, AAU, Anand during 2011-12. The soil used for the experiment was loamy sand in texture and deficient in zinc and medium in nitrogen, available phosphorus and potassium. At the very first, extraction of humic acid from FYM and vermicompost was done by using 0.1 N NaOH extractant. This humic acid was used for both pot experiment and incubation study. In addition to this comparison of both the humic acids was done for their chemical properties. Recovery of humic acid from vermicompost was more as compared to that of FYM. Total acidity, C, H and N was relativelyenSoil Science, StudyStudyThesis