Influence of zinc fractions on available zinc in soil as influenced by application of enriched organic manures under different moisture regimes

摘要

Zinc appears to-be distributed throughout the mineral and organic fractions of the soil. Complexed, water soluble, exchangeable and organically bound fractions which forms less than 5 percent of soil zinc are considered to be important for plant nutrition (Iyengar and Deb, 1977). The form in which zinc is present in soil plays a crucial role in determining its availability to plants. To assess the effect of various fractions of zinc on the zinc availability in soil, a laboratory experiment was conducted at different moisture regimes, the details of which are given in the present paper.