Nature Environment and Pollution Technology

N. Rakesh ¹, D. Kamalakar ¹, P. Kalpana ², P. Rajendra Prasad ³

Affiliations
1 Deptt. of Chemical Engineering, R. V. R and J. C College of Engineering, Guntur-522 019, A. P., IN
2 Department of Chemical Engineering, GMR Institute of Technology, Rajam-532 127, A. P., IN
3 Department of Chemical Engineering, Andhra University, Visakhapatnam-530 003, A. P., IN

Abstract

The paper presents controlled release of zinc sulphate fertilizer made with super phosphate as inert matrix. Pellets were made from the mixture and the release rate of zinc sulphate with time was studied. The parameters covered are fractional zinc sulphate, fractional silicate lime, fractional super phosphate and diameter of the pellet. The parameters also measured with naphthalene coating pellets and compared. The release rate expression was obtained and represented as: -r_A = 5.85 f_ZnSO4 ^1.9 f_s 4.23 f_sl ^-0.72 (d_p/d_s)^1.2. The study is useful to identify the controlled release of zinc sulphate fertilizer and also to predict the release rate at any instant of time.

Keywords

Controlled Release, Release Rate, Fertilizer, Inert Matrix, Binding Agent.

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