Phenology, growth and productivity of rice (Oryza sativa l.) under reduced sunlight intensity and foliar nitrogen application

The field experiments related to the study were conducted at Punjab Agricultural University, Ludhiana and Krishi Vigyan Kendra, Bahowal. There 20 treatment combinations comprising of four levels sunlight intensity [control (full sunlight), 50% reduction in light during 15-45(R15-45), 46-75(R46-75) 76-105(R76-105) DAT] five foliar nitrogen application (only recommended nitrogen, no spray), spray 3% urea before (NB), midway(NM), afterwards(NA) midway-afterwards(NMA) addition application]. Radiation level R15-45 significantly preponed (2-5 days) occurrence phenological stages from maximum tillering physiological maturity. Similarly, R46-75 (3-9 occurrences flag leaf initiation NB, delayed maturity days), NM (2-4 NA anthesis (1-4 NMA panicle emergence days). Plant height rice was increased due (5.21-5.26%) (6.95-7.61%) also with NM, by 9.95-9.89, 9.65-10.06, 8.06-7.57 9.65-9.29 per cent, respectively. Number tillers m-2 reduced (4.71-15.99%) under low conditions (5.59-23.34%) application. Yield attributes affected Grain yield as a result (9.19-11.41%), (14.29-16.35%) R76-105 (8.15-10.67%) resulted significant increase grain 9.32-10.19, 5.74-6.38 4.59-5.74 cent respectively, compared control.