NDLI: Modeling the response of crop emergence to sowing depth and soil water deficit in direct-seeded rice

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Modeling the response of crop emergence to sowing depth and soil water deficit in direct-seeded rice

Content Provider	Consultative Group on International Agricultural Research (CGIAR)
Author	Kanno, Noriko Kumar, Virender Kato, Yoichiro
Spatial Coverage	Japan [JP]
Description	Background and aims Dry direct seeding of rice in the tropics often suffers from poor crop establishment owing to soil water deficit. A potential solution is sowing deeply to utilize residual soil moisture farther below the surface. We evaluated rice emergence under various sowing depths and soil moisture conditions and tested a model framework of it as a simultaneous function of sowing depth and soil moisture. Methods We combined data from three field experiments and one growth chamber experiment to collect emergence data for four rice cultivars (Dontokoi, Dular, Rc222 and Rc420). We independently parameterized the relationships between emergence and sowing depth or soil water tension using logistic functions. We expressed the final emergence as the product of the two functions. Results Emergence responses to sowing depth and soil moisture fitted the cultivar-specific logistic functions well. For Dular, a cultivar that tolerates deep sowing, emergence was greatest when sown at 4 to 5 cm below the surface under soil water deficit, versus 1 to 2 cm under wet conditions, and our combined model successfully reproduced this result. Conclusion Our emergence model framework supports adjustment of sowing depth to account for available soil water, making the model a powerful new tool for drought adaptation in direct-seeded rice.
Sponsorship	Japan Society for the Promotion of Science University of Tokyo
Related Links	https://cgspace.cgiar.org/server/api/core/bitstreams/3f9a8f9e-ece9-42e3-bcd5-67614ad924ca/content
File Format	PDF
ISSN	0032079X
DOI	10.1007/s11104-024-06996-x
Journal	Plant Soil
Edition	2024
Volume Number	2024
Language	English
Publisher	Springer Science and Business Media LLC
Access Restriction	Open
Rights License	CC-BY-4.0
Subject Keyword	Sowing Drought Soil Moisture Deficit Sowing Depth Seedling Emergence Rice Flooded Rice
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Food Science Plant Science

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