RESPONSE OF MAIZE GENOTYPES TO FERTILIZATION ON HYDROMORPHIC SOIL OF SAVA VALLEY
B. Šimić, V. Kovačević, Zorica Jurković
[Poljoprivreda / Agriculture. 9(1):20-24, June 2003.]
Scientific review
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ABSTRACT Growing seed-maize is more profitable than mercantile maize, but also riskier, especially under less favourable soil conditions because parents of maize hybrids are less tolerant than their progeny to environmental stress, including plant nutrition problems. For this reason, we conducted the field experiment with P and K fertilization and a range of maize genotypes (parents of seed-maize) on soil with moderate P and K supplies. Following application of 382 kg P and 726 kg K ha-1, maize grain yields increased from 1.93 t ha-1 to 2.86 t ha-1 (3-year means). High correlations were found between grain yields of maize genotypes and nutrient concentrations in ear-leaf at silking stage (r = 0.82** for P and r = 0.90** for K). Based on these results, we could recommend the higher P and K fertilization of seed-maize crops on soils of similar chemical properties. |
Keywords: fertilization, maize, nutritional status, phosphorus, potassium, yield
REAKCIJA GENOTIPOVA KUKURUZA NA GNOJIDBU NA HIDROMORFNOM TLU POSAVINE
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SAŽETAK Uzgoj sjemenskog kukuruza profitabilniji je od uzgoja merkantilnoga kukuruza, ali i više riskantan, osobito na tlima slabije plodnosti. Razlog tome je u činjenici da su roditelji hibrida kukuruza manje tolerantni od svoga potomstva prema stresu izazvanog okolišem, uključujući i probleme s ishranom. Zato smo postavili poljski pokus gnojidbe fosforom (P) i kalijem (K) i genotipovima kukuruza (roditelji sjemenskog kukuruza) na tlu umjereno opskrbljenom s P i K. Primjenom 382 kg P i 726 kg K ha-1, prinos kukuruza je povećan od 1,93 t ha-1 do 2,86 t ha-1 (3-god. prosjeci). Visoke su korelacije ustanovljene između prinosa zrna genotipova kukuruza i koncentracija P i K u listu ispod klipa u fazi svilanja (r = 0,82** za P and r = 0,90** za K). Na osnovu takvih rezultat, mogli bismo predložiti jače naglašenu gnojidbu fosforom i kalijem od uobičajene za sjemenski kukuruz na tlima sličnih kemijskih svojstava. |
Ključne riječi: gnojidba, kukuruz, stanje hraniva, fosfor, kalij, prinos
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