The influence of increased amounts and source of nitrogen on maize organic production

Abstract

Investigation about effect of high amounts of nitrogen and source of nitrogen on maize organic production was conducted on Agriculture faculty experimental field in Radmilovac. Object of research was hybrid ZP 434. Four variants of nitrogen nutrition were applied: 50 kg/ha, 100 kg/ha, 150 kg/ha 200 kg/ha and control. Second factor was two source of nitrogen ammonium-nitrate (KAN) and carbamide (Urea). Results showed that application of high amounts of nitrogen on soil with 0.17% of this nutrient had significant effect on maize plants, morphological characteristics productivity and nutritive value of grain. Effect of two different sources of nitrogen was influenced by water regime during growing period. Under conditions of better water regime Urea was more suitable for plant nutrition while effect of KAH was better under unfavorable water regime.

Dvogodišnja istraživanja uticaja povećanih količina i oblika azota na organsku produkciju kukuruza izvedena su na Školskom dobru Poljoprivrednog fakulteta u Radmilovcu. Predmet proučavanja bio je hibrid kukuruza ZP 434. Obuhvaćene su četiri varijante ishrane kukuruza azotom 50 kg/ha, 100 kg/ha 150 kg/ha i 200 kg/ha aktivne materije i kontrola. Drugi faktor bila su dva oblik azotnih soli: krečni amonijumnitrat (KAN) i karbamid, odnosno diamid ugljene kiseline (Ureja). Rezultati ovih istraživanja pokazali su da na zemljištu srednje obezbeđenom azotom (0,17%) ovaj biogeni elemenat u povećanim količinama značajno utiče na morfološke i produktivne osobine biljaka, kao i na hranljivu vrednost zrna kukuruza. Oblik azotnih hraniva takođe, je uticao na ove vrednosti, ali je efekat Ureje, odnosno KAN-a bio različit pri različitom vodnom režimu. U uslovima povoljnijeg rasporeda padavina Ureja je bila pogodnija za ishranu biljaka, a KAN u godini sa nepovoljnijim vodnim režimom.