Nitrogen Maize Fertilization Based on Analyses

Gnojenje koruze z dušikom bi moralo temeljiti na stanju razpoložljivega N v tleh oziroma v rastlinah. Zato je bil na njivi Perutnine Ptuj proučen vpliv šestih odmerkov dušika (0, 50, 100, 150, 200, 250 kg N ha-1) na višino rastlin, maso rastlin, pridelek zrnja, značilnosti storža, klorofilmeterskimi odčitki ter povezave med Nmin, pridelkom in klorofilom v listih koruze. Obravnavanje ima statistično značilen vpliv na analizo zrnja, na višino in maso rastlin 10 m-2. Najvišjo maso rastlin smo dobili pri odmerku nad 150 kg N ha-1. Prav tako imajo obravnavanja statistično značilen vpliv na dolžino, dolžino neoplojenega dela ter na število vrst na storžu. Pri tem je meritev klorofila v fazi 7-9 listov pri kontroli znašala 415 pri odmerku 250 kg N ha-1 pa 503. Na podlagi determinacijskega koeficienta (R2) lahko z N-min pojasnimo 52,5 % variabilnosti klorofilmeterskega odčitka in 38,4 % variabilnosti pridelka zrnja. Pri tem so korelacijske povezave med klorofilmeterskim odčitkom in pridelkom ter med N-min in pridelkom čvrste.The fertilization of maize with nitrogen should be based on the amounts of nitrogen in the soil or in the plants in the fertilization area. The effects of six rates of nitrogen (0, 50, 100, 150, 200, 250 kg N ha-1) on plant height, plant weight, grain yield, cob characteristics, chlorophyll meter readings in the leaves, and correlation between N-min, yield and chlorophyll meter readings were carried out on a portion of land provided by Perutnina Ptuj. The treatment significantly affects corn analysis, plant height and plant weight. The maximum plant weight was over 150 kg N ha-1. The treatment also significantly affects the length, unfertile part and the number of lines on the cob. The chlorophyll readings for the V7−V9 stage at the control treatment were 415 and at the rate of 250 kg N ha-1 they were 503. Regarding the calculated coefficients of determination (R2), varying the N-min leads to a variation of 52.5% in the chlorophyll meter readings and a grain yield variation of 38.4%. The correlation coefficients between the chlorophyll meter readings and yield readings, and between N-min and yield are strong