Author(s): Narisipuram Harika, RB Singh, Umesh Singh and Pradeep Mishra

Abstract: Agriculture plays a crucial role in Indian economy; it contributes nearly 17% to Indian GDP. In a country like India where over 70 per cent of rural population depends on agriculture for their livelihood and more than 50 per cent of net sown area comes under rainfed agriculture, it is important to analyse the rainfall trends as it is critical for determining water availability to meet a variety of demands, including agricultural, industrial. We can make better decisions on crop sowing timing and irrigation patterns by doing trend analysis study, resulting on a higher yield. So, the present study has attempted to know the rainfall patterns of Visakhapatnam district of Andhra Pradesh for over 31 years from 1991-2021, 31 years data was collected from Indian Meteorological Department, Pune later using non- parametric methods like Mann- Kendall, spearman rho and Sen slope estimator test.The analysis showed that the average rainfall of Visakhapatnam district in Andhra Pradesh for 31 years from 1991-2021 was 1111.33 mm and 728.62, 223.59, and 159.85 mm of rain on average during the monsoon, pre-monsoon, and winter months. There are 53 annual rainy days during this time, 35, 12, and 6 rainy days over the seasons, respectively. Therefore, the results clearly depict that the intensity of rainfall was higher during monsoon season. The main aim of the study is to provide detailed knowledge of the rainfall pattern and identify if there are any changes in trend change points in the time series. The results will benefit sustainable agriculture activities planning in the region like sowing time of crop, therefore enhancing productivity of crops.

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