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Absorption of Zn65 by plant roots from a layer of dry top soil (suction > 15 bar) was measured using a technique that obviated water stress in the plant.

Effects of water content of the topsoil on the supply of manganese, zinc and copper to plants from an acid, siliceous sandy soil were investigated. The experiment was designed to provide a good supply of water and of nutrients other than those mentioned above at all times.

A glasshouse experiment was conducted to study the effects of water content of the topsoil on the micronutrient nutrition of Italian ryegrass (Lolium multiflorum Lam.) growing in a siliceous sandy soil of marginal micronutrient status, with and without a supply of micronutrients at lower depths. The main objectives were to investigate whether micronutrient supplies would be sustained for the regrowth of defoliated grass after the topsoil had dried, and to assess the contribution made by small amounts of micronutrients in the subsoil to nutrient supply.