Performance of Varieties under Different Nitrogen Fertilizer Levels

Nitrogen influence plant growth and yield of crops. To evaluate the yield potential of different pre released rice genotypes at different Nitrogen levels under Northern Telangana Zone. Experiment was laid out insplit plot design with five main plots (pre released cultures) and four sub plots (nitrogen levels) at RARS, Jagtial, Kharif 2018-19 to Rabi 2019-20.

Four pre released cultures of Northern TelaganaZone viz., C1-KNM-733, C2- KNM-1638, C3- JGL 24423 and C4: JGL-H-1 along with one check variety C5-MTU-1010 were evaluated and four nitrogen levels were tested . Based on two seasons data, 100% RDN:100-120 kg N ha-1 is enough with respect to KNM 1638 during Kharif 2018 and JGL-24423 during Rabi 2018-19 with 100% RDN-120-150 kg ha-1. Application of 100% RDN was on par with 90% RDN with urea were recorded highest yields with respect to varieties KNM 1638 during Kharifand JGL-24423 during Rabi.The highest yield was recorded in with respect to varieties KNM 1638 (9341kgha-1) followed JGL24423 (9927kgha-1) compare to check (9,341 kgha-1) during kharif season. Among the nitrogen levels 100% RDN recorded highest yield (10328 kg ha-1) and increasing dose resulted in decreasing yield. But cost benefit ratio was also highest recorded in JGL-24423(1:1.37) followed by KNM 1638 (1:1.31) during kharif season. In rabithe highest yield was recorded in pre released cultures JGL 24423 (5802kgha-1) followed by KNM 733 (5731kgha-1) compare to check (4651 kgha-1) and with respect to the nitrogen levels 100% RDN recorded highest yield @5231 kg ha-1 was on par to 90%RDN @ 4774 kg ha-1. B:C ratio maximum in JGL24423 was 1.37 and KNM733 was 1.36 and among the nitrogen levels 100 RDN @ 1.32 and 90%RDN @1.02.It canbe concluded that 100% RDN-100-120 kg N ha -1 is enough with respect varieties KNM 1638 during Kharif 2018-19 and JGL-24423 during Rabi-18-19 with 100% RDN-120-150 kg ha -1.