The Effects of Different Levels of Nitrogen and Plant Density on Nitrogen, Phosphorus and Potassium Uptake, Nitrogen Use and Uptake Efficiency in Cumin (Cuminum cyminum) Fruit

In order to investigate the effects of different levels of nitrogen and plant density on the uptake of nitrogen, phosphorus and potassium, nitrogen use and uptake efficiency in Cuminum cyminum fruits, a factorial experiment based on randomized complete blocks design with three plant densities, four nitrogen levels and three replications at field experimental of Nasar conservatory in Golge Rokh Torbat Heydarei was conducted. The results of this study showed that interaction effects between nitrogen fertilizer and plant density had significant effect (P≤ 0.01) on potassium and phosphorus percentage, but there were no significant effect on nitrogen percentage, use and uptake efficiency. According to the results of mean comparison, maximum uptake of N, P and K were obtained at 100 plant/m2 with 150 kg/ha N application. Furthermore, the highest nitrogen use and uptake efficiency were obtained from 50 kg/ha and 120 plant/m2,respectively. In conclusion, the results of this study showed that with decreasing plant density, potassium, nitrogen and phosphorus uptake were increased, due to the low competition among the plants for obtaining their required nutrients. Although the same effect on use and uptake efficiency were not observed.