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Assessing the impact of dry spell during monsoon season on rice productivity - A case study over Patna district

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Title Assessing the impact of dry spell during monsoon season on rice productivity - A case study over Patna district
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Creator N.Subash
 
Subject 10 Days consecutive dry spell, Monsoon rainfall, Rainfall variability, Rice productivity anomaly
 
Description Not Available
The monthly, seasonal and yearly rainfall characteristics, frequency of occurrence of 10 days or more consecutive dry spells during monsoon season and their influence on rice productivity were investigated using daily rainfall data for 49 years (1960–2008) recorded at Agricultural Research Institute, Patna, Bihar. The results revealed that monsoon season receives 84.4% (959.5 mm) of the annual rainfall (1136.8 mm) followed by 7.9% (89.6 mm) during post-monsoon season. The coefficient of variation of annual rainfall was recorded as 26% and the monthly values ranged from 43.2% (August) to 210.9% (December). The data on rice productivity was fitted into different models in curvefit program and it was observed that R2 value was higher for 10th degree polynomial fit. The scattering of data points from the trend line (10 th degree polynomial curve) indicated higher year-to-year variability. During the study period, 10 days or more consecutive dry spells occurred in four years (1966, 1982, 2004 and 2005) during July. During all the years, the rice productivity was recorded below the technological trend productivity. Similarly, 10 days or more consecutive dry spells during August occurred in four years (1968, 1973, 2004 and 2006) affecting the productivity. This clearly showed that if any 10 days or more consecutive dry spells occur during the months of July and August, there is likelihood of low rice productivity. This study also showed occurrence of 10 days or more consecutive dry spells during September may not have impacted severely rice productivity because of the flooded paddy fields along with higher relative humidity reducing the water demand and thereby the rice crop never experienced severe water stress situations.
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Date 2018-12-03T05:53:22Z
2018-12-03T05:53:22Z
2014-01-01
 
Type Research Paper
 
Identifier Subash, N. (2014). Assessing the impact of dry spell during monsoon season on rice productivity - A case study over Patna district. Indian Journal of Soil Conservation 42(3): 255-259.
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http://krishi.icar.gov.in/jspui/handle/123456789/15156
 
Language English
 
Relation Not Available;
 
Publisher Indian Association of Soil and Water Conservationist