Effect of zinc enriched compost on transformation of zinc in rice soils of New Cauvery Delta of Thanjavur District, Tamil Nadu, India.

摘要

A field experiment was conducted during 2008-09 to study the effect of zinc enriched compost on transformation and availability of zinc in sandy loam soil under wet land condition. The ZnSO₄ was enriched with organics i.e., sugarcane pressmud compost and sugarcane pressmud compost witii sewage sludge (3:1) @ 0, 50, 75 and 100% or recommended zinc for rice in the state. The results proved that most of the applied zinc existed as Am Fe-Zn and the incorporation of Zn enriched compost increased the different Zn fractions appreciably as against the ZnSO₄ application. The relative distribution of various Zn fractions were in the order, Am Fe-Zn > Mn Ox-Zn > Om-Zn > Ws+Ex-Zn irrespective of zinc levels as enriched compost. The zinc fractions viz., Ws+Ex-Zn, Om-Zn and Mn Ox-Zn shown a conspicuous increase, which are known to play a vital rote in zinc nutrition of rice. The relationship between Ws+Ex-Zn; Om-Zn; Mn Ox-Zn and DTPA-Zn visualized the existence of dynamic equilibrium among the different Zn fractions in wetland rice soils.