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1 Department of Agronomy, India
2 Principal, Bihar Agricultural College, India
*Corresponding author:Sunil Kumar, Department of Agronomy, India
Submission: July 18, 2018; Published: November 26, 2018
ISSN: 2637-7659 Volume3 Issue4
Rainfall analysis for Pusa, Purnia, Sabour and Patna representing north west alluvial plains (Zone I), north east alluvial plains (Zone II) and south alluvial plains (Zone III A and III B), respectively using annual and weekly rainfall data was carried out for Bihar state. The overall mean annual rainfall was lowest (1031 mm) for zone III B and highest (1466.7mm) for zone II. But coefficient of variation was highest (30.8%) for Pusa (zone I) and lowest (23.7%) for Patna (zone III B). A long-term significant decreasing trend in annual rainfall was observed in Patna (zone III B). At Pusa and Purnea, 25th to 34th SMW are favorable weeks for field preparation/sowing and transplanting of rice crop due to more than 75% probability of rainfall of 10-30mm. At Sabour, probability of rainfall being more than 20mm is 75% during 25th-33rd week while for Patna; it is during 27th-34th SMW. So, sowing and field operations may be delayed by two weeks in Patna region. The study revealed that crop varieties could be selected through the analysis of wet spell durations with the onset of monsoon in each region. In the flood situation, short duration rice varieties can be grown after removal of flood water. When monsoon is late or dry spell is encountered, it is wise to follow direct seeded rice or intercropping of green gram or black gram. Under stress situations, less water requirement suited crops like sorghum, ragi, finger millet and others could be adopted preferentially on land use suitability of a given soil.
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