Influences of soil and fertilization with phosphorus and potassium on zinc, manganese, copper and iron status in maize

Jurkovic, Z. and Kovacevic, V. and Loncaric, Z. and Zdunic, Z. (2006) Influences of soil and fertilization with phosphorus and potassium on zinc, manganese, copper and iron status in maize. Cereal Research Communications, 34 (1). pp. 525-528. ISSN 0133-3720

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Abstract

Increased rates of P and K (monoammonium phosphate and potassium chloride) were applied in four replicates on two soils in spring 2001 as follows: a) standard fertilization (kg ha ⁻¹ : 177 N + 100 P ₂ O ₅ + 150 K ₂ O); b) a + 1500 kg P ₂ O ₅ ha ⁻¹ ; c) a + 1500 kg K ₂ O ha ⁻¹ ; d) = b + c. Residual effects of the fertilization were tested in the next year. Maize (OsSK552 hybrid) growing on Luzani soil resulted in 15% lower yield compared to the Kobas soil (7.75 and 9.06 t ha ⁻¹ , respectively). Mean the leaf (the ear-leaf at silking) concentrations (mg kg ⁻¹ ) were 41.8 (Zn), 14.1 (Cu) and 131 (Fe), respectively. The leaf Mn was by 60% lower and the leaf Zn by 16% higher in 2002 compared to 2001. Maize grown in the Luzani trial had by 9% lower the leaf Zn, 10% lower the leaf Cu and by 37% higher the leaf Mn compared to the Kobas soil. Under the influence of P fertilization, the leaf Zn decreased by 37% compared to the control. Application of both P and K resulted in decreases of leaf Zn by 30%. However, P fertilization, alone or in combination with K, increased the leaf Mn for 111% and 72% respectively. Significant difference the leaf Cu (by 9% lower) was found under influences K fertilization only. The leaf Fe was independent on these factors.

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