Chemical Speciation of Zinc and their Availability to Wheat in a Typic Haplusterts as Influenced by Zinc Fertilization
Keram K. S.*, Sharma B.L., Sharma G.D.
Department of Soil Science and Agricultural Chemistry, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur, 482 004, Madhya Pradesh, India
*Corresponding author E-mail: firstname.lastname@example.org
The results of comprehensive field ex-periment was revealed the application of Zn @ 2.50, 5.00, 10.00 and 20.00 kg ha−1 significantly increased DTPA-extractable Zn, WS-Zn, EX-Zn, CMPLX-Zn, ORG bound-Zn, CRAMOX bound-Zn, CRYOX bound-Zn and total-Zn at 0, 15, 30, 60, 90 and 120 DAS as compared to control. Howev-er, the DTPA-extractable Zn, WS-Zn, EX-Zn, CMPLX-Zn, ORG bound-Zn, CRAMOX bound-Zn, CRYOX bound-Zn and total-Zn reduced with ascending days after sowing (0 to 120 DAS). The maximum residual-Zn was observed with the application of 1.25 kg Zn ha−1 at 15, 30, 60, 90 and 120 DAS. Further, it was revealed that the fractions contributing to directly and positively to total-Zn are WS-Zn, EX-Zn, CMPLX-Zn, ORG bound-Zn, CRAMOX bound-Zn, CRYOX bound-Zn and residual-Zn and indicates the influence of these fractions on availability of Zn in soil un-der field condition. The per cent contribution of all the fractions to total-Zn decreased with the increasing days after sowing (0 to 120 days), while the contribution of residual-Zn was maxi-mum and increased with ascending days after sowing.