Rice responds to zinc in landformed fields (2012)

Beecher G, Dunn B


When topsoil is removed during landforming, often the subsoil is exposed and remains at the soil surface. The subsoil is frequently deficient in nitrogen and phosphorus, and sometimes zinc. Zinc is important for rice nutrition. Zinc deficiency causes
flooded rice seedlings to starve for oxygen, impacting on rice seedling vigour and survival. When sowing into cut areas with exposed subsoil, apply zinc
as a seed coat or apply zinc in a fertiliser blend when drill sowing rice. In a fertiliser blend, aim to apply zinc at a rate of 5 kg Zn/ha. The zinc fertiliser needs to be placed close to the seed. High levels of soil phosphorus or high phosphorus fertiliser applications to soils with low levels of zinc are commonly responsible for zinc deficiencies in rice, as are sites where soils have elevated bicarbonate levels.