engleski

Influences of fertilization on yield and nutritional status of maize

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 P2O5 + 150 K2O) ; b) a + 1500 kg P2O5 ha-1 ; c) a + 1500 kg K2O 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.

maize ; grain yield ; phosphorus ; potassium ; fertilization ; ear-leaf ; zinc ; manganese ; copper ; iron

nije evidentirano