engleski

Influences of fertilization by phosphorus and potassium on yield and nutritional status of corn

A field experiment with ameliorative fertilization was conducted in four replicates on the Luzani hydromorphic soil in 2001 as follows: a) control ; b) a + 750 kg P2O5 ha-1 ; c) a + 1500 kg P2O5 ha-1 ; d) a + 750 kg K2O ha-1 ; e) a + 1500 kg K2O ha-1 ; f) = c + e. Phosphorus was applied as monoammonium phosphate (MAP: 12% N + 52% P2O5) and potassium as KCl. Residual effects of the ameliorative fertilization were tested in the next growing season (2002) with ordinary fertilizer application rate (kg ha-1: 177 N + 100 P2O5 + 150 K2O). In each plot of three corn hybrids were grown (OsSK44, OsSK552 and Bc5982). As affected by fertilizeration corn yields were increased in comparison with control up to 22% and 25% for 2001, and 2002, respectively. In both years of testing the hybrids OsSK444 and Bc5982 had similar yields. However, the yields of the OsSK552 were for 9% lower and for 10% higher in comparison to the remaining two hybrids for the 2001 and the 2002, respectively.

potassium; phosphorus; corn; ameliorative fertilization; hydromorphic soil

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