engleski

Impacts of ameliorative fertilization by phosphorus and potassium on maize yields

The field experiment of phosphorus (triplephoshate 45% P2O5) and potassium (muriate of potash 60% K2O) fertilization was conducted on planosol (pH 1n KCl = 3.67) of Central Croatia (Bjelovar-Bilogora County) in spring 2004 (a = ordinary fertilization, b = a + P1, c = a + P2, d = a + P3 , e = a + P1, f = a + P2, g = a + P3 , h = a + P2K2). The amounts of added either/or P2O5 and K2O were (kg/ha) 500, 1000 and 1500, for the step 1, 2 and 3, respectively. The experiment was conducted in four replicates (basic plot 77 m2). In the next years (2005-2009) the experiment fertilized uniformly (maize: 160 N + 60 P2O5 + 80 K2O kg/ha). Aim of this study was testing residual effects of the fertilization on maize in 2008 and 2009. Maize yields was for 17% higher in 2008 than in 2009 (11. 37 and 9.69 t/ha, respectively) mainly due to summery differences in precipitation and temperature regimes (July+August: 2008 and 2009 = 136 and 72 mm, 21.8 and 22.5 oC). By the fertilization yields of maize were increased up to 9 % in 2008 and 14 % in 2009. With that regard, by g (P3) and h (PK) treatments were achieved the highest yields (g + h means: 11.81 and 10.21 t/ha, for 2008 and 2009). Also, by the P3 treatment grain moisture was decreased for 4.7% (2-year means: 25.2% and 20.5%, for a and g, respectively).

maize ; phosphorus and potassium ; ameliorative fertilization ; yield

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