Author(s):

KH Bodar, KB Polara, PB Bunsa and BB Barad

Abstract: A field study entitled “Fractions of Zinc in Calcareous Vertic Haplustepts as Influenced by Sixteen Years of Fertilization and Manuring in LTFE Soils” at Junagadh. The effect of integrated nutrient management (INM) on fractions of zinc under groundnut-wheat cropping sequence of a Haplustepts soil was studies in a long-term field experiment initiated during kharif 1999 at Junagadh, Gujarat. Effect of varying dose of N, NP, NPK with FYM, Zn, S and Rhizobium on fractions of zinc. The soil of the experimental site was clay loam in texture, alkaline in reaction, low in available nitrogen and phosphorus, while high in potassium, sulphur and zinc. The study was aimed to find out the effect of continuous application of inorganic fertilizers and organic manure on the distribution of Zn fractions. There was an increase in soil DTPA available Zn status of LTFE soils, while some important forms of Zn such as reducible Zn, total Zn and residual Zn was recorded decline. Conversion of exchangeable to DTPA-Zn was evident. In light of this, overall mean DTPA available Zn was recorded high values (1.43 ppm) as compared to the critical values. Further the internal turnover of Zn along with other fertilizers could also help avoid the deficiencies of Zn even on a long run. The whole spectrum warranted a need to supply Zn nutrient through suitable sources to stabilize Zn status in the soil. The total form was a predominant component followed by DTPA available Zn. There were inter-conversions from DTPA available as well as total form to the reducible forms in a long run.

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