In recent years a physiological disorder of rice (Oryza sativa L.) seedlings growing in soils high in exchangeable calcium has been diagnosed as zinc deficiency. Calculations show that less than 30 g of zinc is needed to satisfy the nutrition of a hectare of 6-8-wk-old rice plants. Rice seed was soaked and germinated in dilute solutions of zinc ethylenediamine tetraacetate, zinc sulfate and zinc lignosulfonate prior to planting in greenhouse pots containing a zinc-deficient soil. The rice plants grown from the zinc-treated seed produced more growth and sorbed more zinc than rice plants grown from untreated seed.
Kasireddy, Narsimaha R. and Thompson, Lyell F.
"Zinc Nutrition of Rice Plants as Influenced by Seed Germinated in Zinc Solutions,"
Journal of the Arkansas Academy of Science: Vol. 28
, Article 14.
Available at: http://scholarworks.uark.edu/jaas/vol28/iss1/14