Sanjeevaiah, SH and Rudrappa, KS and Lakshminarasappa, MT and Huggi, L and Hanumanthaiah, MM and Venkatappa, SD and Lingegowda, N and Sreeman, SM (2021) Understanding the temporal variability of rainfall for estimating agro-climatic onset of cropping season over south interior Karnataka, India. In: Agronomy, 11 (6).
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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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
| Item Type: | Journal Article |
|---|---|
| Publication: | Agronomy |
| Publisher: | MDPI AG |
| Additional Information: | The copyright for this article belongs to MDPI AG |
| Department/Centre: | Others |
| Date Deposited: | 03 Aug 2021 11:23 |
| Last Modified: | 03 Aug 2021 11:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/69013 |
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