engleski

Heredity impacts on phosphorus and potassium concentrations in maize

Twenty maize (Zeal mays L.) hybrids were grown under field conditions on acid (pH KCl = 4.77) hydromorphic soil (moderate supplies of available P and according AL-method: 7.91 P2O5 and 9.17 K2O/100 g) during the 2000 and 2001 growing seasons (4 replicates, plant density 71429 plants/ha, basic plot 7.0 m2 = one 10-m row). Considerable differences of P and K status in the ear-leaf at silking stage were found among the maize hybrids. For example, they were from 0.269 % to 0.465% P, as well from 1.56% to 2.45% K. The lower P concentrations were found in three maize hybrids (OsSK378, OsSK298 and OsSK382: mean 0.276% P), while in four hybrids they were considerably higher (Alpos, Bc278, OsK2-191 and Clarica: mean 0.382% P). In two maize hybrids were found K concentrations lower than 1.60% K (OsSK333 and Os298: mean 1.57% K), while in five hybrids they were above 2.00% K (Os395, RK1456, Podravec 36, Os332 and Alpos: mean 2.17% K). Agreement of the leaf composition among the hybrids (comparison the results for 2000 and 2001) was considerably higher for P (r = 0.816**) than for K (r = 0.493*). Yield agreement was also significant (r = 0.587**). In both years of testing, negative correlation between yields and P status was found (r = -0.529* and -0.739**, for 2000 and 2001, respectively), while relationship between K and yields was low (r = -0.246 and -0.170, respectively).

maize hybrids ; Phosphorus status ; Potassium status ; heredity

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