Evaluation of different levels of nitrogen and superabsorbent polymer on yield and yield components of maize

To evaluate the effects of different levels of nitrogen and superabsorbent polymer on the performance and its components of maize (single cross (SC) 704), an experiment was conducted as split plot in a randomized complete block design with four replications, at the research farm of Islamic Azad University, Karaj branch, in 2015.The main factor of experiment included four levels of nitrogen (control, 150, 200 and 250 kg) and sub factor of experiment included two levels of with and without application of superabsorbent Estacozorob.The results showed that different levels of nitrogen significantly (P≤ 0.01) affected on the weight percentage of ear of corn, weight of thousand seeds, seed yield, biological yield, harvest index, number of kernels per ear of corn.The different levels of polymer had significant effects on the harvest index (P≤ 0.05) and other characters (P≤ 0.01). The interaction between different levels of nitrogen and superabsorbent only had no effect on the harvest index; however, significantly (P≤ 0.01) affects other characters.The highest weight of thousand seeds (232.57 g) and seed yield (12352.2 kg per ha) were caused by application of nitrogen fertilizer on the basis of the recommended dose (200 kg per ha) and superabsorbent polymer.