EFFECT OF DIFFERENT SCHEDULING OF NITROGEN AND ZINC APPLICATION ON HYBRID RICE

Abstract

The field experiment was conducted at the Experimental plot of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka-1207 during the period from November, 2019 to May, 2020 in Boro season to find out the effect of nitrogen and zinc scheduling on performance of hybrid rice. BRRI hybrid dhan2 was used as planting material in this study. The experiment consisted of two factors: Factor A: Nitrogen management (3 levels) as i) N 0 – 0 kg ha -1 (control), ii) N 1 ii – 100 kg ha [50% RDN at 15 DAT + 50% RDN at 35 DAT] and iii) N 2 – 150 kg ha -1 [50% RDN at 15 DAT + 25% RDN at 35 DAT + 25% RDN at 50 DAT]. Factor B: Zinc management (4 levels) as i) Zn 0 - 0 kg ha -1 (control), ii) Zn 1 – 5 kg ha -1 [0.50% ZnSO 4 . H 2 O spray at 75 DAT (booting)], iii) Zn 2 – 10 kg ha -1 [0.25% ZnSO 4 . H 2 O spray at 75 DAT (booting) + 0.25% Zn spray at 90 DAT (anthesis)] and iv) Zn 3 – 10 kg ha -1 [0.25% ZnSO 4 O spray at 75 DAT (booting) + 0.25% Zn spray at 100 DAT (milking)]. The experiment was laid out in a Randomized Complete Block Design (Factorial) with three replications. Data on different growth and yield parameters of rice were recorded and significant variation was observed for different treatments. The maximum number of panicles hill⁻¹ (14.25), the longest panicle (25.73 cm), the highest number of grains panicle⁻¹ (111.95), the maximum 1000-grain weight (25.50 g), the highest grain yield (7.11 t ha⁻¹), the maximum straw yield (7.40 t ha⁻¹), significantly the maximum biological yield of 14.51 t ha⁻¹ and the highest value of harvest index (48.33%) were found from N 2 (150 kg N ha⁻¹) treatment. The highest number of panicles hill⁻¹ (13.33), the highest value of grains panicle⁻¹ (106.11), the maximum weight of 1000-grains (24.38 g), the highest grain yield (6.32 t ha⁻¹), the maximum straw yield (6.86 t ha⁻¹), the maximum biological yield (13.18 t ha⁻¹) and the highest value of harvest index (47.20%) was found from Zn 2 (10 kg Zn ha⁻¹) treatment. The application of 150 kg N ha⁻¹ [50% RDN at 15 DAT + 25% RDN at 35 DAT + 25% RDN at 50 DAT] and 10 kg Zn ha⁻¹ [0.25% ZnSO 4 . H 2 O spray at 75 DAT (booting) + 0.25% Zn spray at 90 DAT (anthesis)] provided significantly higher yield contributing and yield parameters in BRRI hybrid dhan2.