Agroclimatic inventory for environmental characterization of rainfed rice-based cropping systems of eastern India
2000
Sastri, A.S.R.A.S. and V. P. | Singh
Climate is an important component of environment. In environmental characterization for developing strategies to improve productivity, an agroclimatic inventory is a prerequisite. In eastern India, comprising the states of Orissa, Bihar, West Bengal, eastern Madhya Pradesh, eastern Uttar Pradesh, and the northeastern states, rice is grown mostly under rainfed conditions in upland, lowland, and flood-prone ecosystems. As this region comes under the influence of the southwest monsoon from June to October, crop productivity depends entirely upon the vagaries of monsoon. Also, because of monsoon activity, the sky is mostly overcast and radiation becomes a limiting factor. In this study, the moisture regime was analyzed using simple measures such as amount of rainfall and number of rainy days and deprived parameters such as moisture availability and stable rainfall periods at different probability levels. A concept of stable rainfall period has been developed by defining it as a period when weekly rainfall exceeds 50mm.
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