Effect of nitrogen uptake on leaf area development and light interception of leek (Allium porrum L.)

Abstract

Experiment with leek (Allium porrum L.) was carried out in the field conditions, on a cambic soil. The aim of the experiment was to establish relationships among nitrogen uptake, leaf area index and light interception of leek crop. Nitrogen fertilizer, urea, was applied in amount of 250 kgN/ha. before transplanting (250 kgN/ha+0) and twenty days after transplanting leek (0+250 kgN/ha). Our results obtained that the second way of nitrogen fertilizer applying had a great influence on leaf area development, dry matter production and nitrogen uptake. Increasment of these parameters directly or indirectly had a great effect on increment of leaf area index and light interception of leek crop. .

U cilju proučavanja mineralne ishrane praziluka (Allium porrum L.) azotom predmet istraživanja bio je mehanizam delovanja usvajanja azota (Nu) na indeks lisne površine (LAI) i intercepciju svetlosti (I) kao značajnih pokazatelja produktivnosti u biljnoj proizvodnji. Praziluk je gajen na zemljištu tipa gajnjače, a za đubrenje useva upotrebljeno je sporo-delujuće azotno đubrivo urea u dozi od 250 kg N/ha, neposredno pre, odnosno dvadeset dana posle rasuđivanja praziluka. Povećano usvajanje azota, kao i jaza ontogeneze u uslovima đubrenja imali su značajan efekat na povećanje lisne površine, indeksa lisne površine i intercepciju svetlosti, stoje rezultiralo i povećanom produkcijom suve materije (W) useva praziluka. .