Vol. 12, Issue 6 (2023)

Author(s):
NB Pawar, HC Patel, NB Patel and CJ Patel

Abstract:
Field experiments were conducted during kharif 2016, 2017 and 2018 to ascertain the effect of transplanting dates and nitrogen levels on the incidence and severity of rice diseases. The pooled results showed that rice seedlings transplanted on 2nd and 4th week of July recorded minimum sheath rot intensity of 12.63 and 12.06 percent respectively and whereas, minimum bacterial blight disease intensity, 16.96 per cent was observed when rice seedlings transplanted on 4th week of July. However, seedlings transplanted in 2nd week of August recorded maximum sheath rot incidence (26.22%), sheath rot intensity (20.98%) and bacterial blight disease intensity (33.21%). In case of discolor grains, the crop transplanted during 4th week of July registered lower (6.74%) per cent of discolored grains and were significantly superior over 2nd week of August transplanting date (10.29%). The increase rate of nitrogen levels from 80 to 100 to 120 kg/ha is directly proportional with increase disease intensity. The maximum grain yield (3070 kg/ha) and straw yield (4640 kg/ha) were obtained during 4th week July transplanted seedlings, whereas minimum grain and straw yield was noticed when seedlings were transplanted in 2nd week of August. Moreover, the maximum grain and straw yield 2994 kg/ha and 4468 kg/ha, respectively was recorded in treatment plots fertilized with 100 kg N/ ha.