1. Understanding the Temporal Variability of Rainfall for Estimating Agro-Climatic Onset of Cropping Season over South Interior Karnataka, India
- Author
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Shivaramu Huchahanumegowdanapalya Sanjeevaiah, Nagesha Lingegowda, Kodandarama Shettygowdanadoddi Rudrappa, Manjunatha Melekote Hanumanthaiah, Sheshshayee M. Sreeman, Sowmya Dadireddihalli Venkatappa, Lingaraj Huggi, and Mohankumar Thavakadahalli Lakshminarasappa
- Subjects
Wet season ,010504 meteorology & atmospheric sciences ,onset ,0208 environmental biotechnology ,02 engineering and technology ,Monsoon ,01 natural sciences ,Crop ,Fortnight ,0105 earth and related environmental sciences ,Crop yield ,fungi ,Sowing ,food and beverages ,SIK ,Agriculture ,Land preparation ,020801 environmental engineering ,Agronomy ,rainfall trend ,rainfall shift ,Environmental science ,early season drought ,Agronomy and Crop Science ,Cropping - Abstract
Annual, seasonal and intra-seasonal variations in rainfall affect crop production from land preparation to the realization of potential crop yield in a region. Particularly, the onset of the rainy season is most crucial for determining the sowing period. Statistical analysis (Modified Mann-Kendall aka MMK-test for trend and likelihood ratio test for shifting pattern) of 60 years rainfall of south interior Karnataka (SIK) inferred the presence of temporal variability in rainfall. There was a monotonic increase in rainfall of February, March, April, June and August months (a positive sign of MM-K (tau) value), with a negligible rate of change (Sen’s slope towards zero). Upon seasonal analysis, there was a significant increase in winter, pre-monsoon and monsoonal rainfall as compared to post-monsoonal rainfall (higher Sen’s slope for pre-monsoon), indicating a need for agronomic interventions for estimating an effective date of sowing for reducing risks of crop production. Further, the agro-climatic onset of cropping season was estimated by considering soil–crop–water relations. Earlier onset of cropping season was estimated based on thresholds of soil–crop–water relations, which highlights sowing of crops in advance (May 1st fortnight) instead of late (June 1st fortnight) to avoid crop losses due to early-season drought.
- Published
- 2021
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