EFFECTS OF EXOGENOUS NITROGEN LEVELS ON THE YIELD OF RICE GRAIN IN SHEIKHUPURA, PAKISTAN
Muhammad Nawaz*, Anwar Javaid Wahla*, Muhammad Saleem Kashif*, Masood Qadir Waqar**, Muhammad Anjum Ali*** and Asim Raza Chadhar****
A three-year field experiment was conducted at Adaptive Research Farm, Sheikhupura to optimize the nitrogen levels for two coarse cultivars. The coarse rice cultivars are the non-basmati rice cultivars having no fragrance. The experiment was laid out in randomized complete block design in factorial arrangement. The experiment consisted of three nitrogen rates viz. 85, 170 and 255 kg ha , and two rice cultivars viz. KSK- 133 and KS-282. Both these rice cultivars are widely grown by the farmers in rice-wheat around the experimental site. Every year, the nursery of both the rice cultivars was transplanted during the second week of July. The results indicated that different nitrogen levels had a significant effect on all studied parameters of both rice cultivars during all the years of experimentation. Both cultivars also differed significantly from each other in number of grains per spike, 1000-grain weight and paddy yield during all the years of experimentation. Application of nitrogen at 255 kg ha was the most suitable level of nitrogen for both the cultivars. The performance of KSK-133 was better than KS-282 at all levels of N during all the years. In conclusion, to attain higher yields of coarse rice, KSK-133 should be grown and the nitrogen should be applied at 255 kg ha under agroecological conditions of Sheikhupura.