Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season
<div class="page" title="Page 2"><div class="layoutArea"><div class="column"><p><span>Growing degree-days (DD- °C days) required to complete growth phases in plants is generally considered as a constant. However, this practice has...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Faculty of Science, University of Peradeniya, Sri Lanka
2022-09-01
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| Series: | Ceylon Journal of Science |
| Subjects: | |
| Online Access: | https://cjs.sljol.info/articles/8031 |
| _version_ | 1797984412755820544 |
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| author | L. Suriyagoda T. Illangakoon S. Wijerathna U. Devasinghe |
| author_facet | L. Suriyagoda T. Illangakoon S. Wijerathna U. Devasinghe |
| author_sort | L. Suriyagoda |
| collection | DOAJ |
| description | <div class="page" title="Page 2"><div class="layoutArea"><div class="column"><p><span>Growing degree-days (DD- °C days) required to complete growth phases in plants is generally considered as a constant. However, this practice has recently been questioned. Therefore, we tested the DD requirement for the growth phases of three Sri Lankan rice varieties, Bg300, Bg352 and Bg358. These rice varieties are widely cultivated in Sri Lanka across years, seasons and locations. When averaged across seasons, years and locations, the DD required for heading and maturity of Bg300 were 1,051 and 1,543 °C days, while those of Bg352 were 1,098 and 1,627, and Bg358 were 1,203 and 1,698 °C days, respectively. Moreover, DD required for heading and maturity varied among locations. Number of days required for heading and ripening correlated negatively, </span><span>i.e</span><span>., reducing ripening duration by 8.4 h due to the delay in heading by one day. Further, DD required for heading and maturity were positively correlated with the mean seasonal minimum and maximum temperatures. Therefore, crop duration could not be lowered as expected under warming climates. Hence, genotype × environment dependent DD requirements of rice varieties need to be considered when making agronomic and policy decisions in both regional and seasonal scales, and increasing the precision of phenology predictions.</span></p></div></div></div> |
| first_indexed | 2024-04-11T07:02:27Z |
| format | Article |
| id | doaj.art-702ac13a76fc452087f441a9359ad09e |
| institution | Directory Open Access Journal |
| issn | 2513-2814 2513-230X |
| language | English |
| last_indexed | 2024-04-11T07:02:27Z |
| publishDate | 2022-09-01 |
| publisher | Faculty of Science, University of Peradeniya, Sri Lanka |
| record_format | Article |
| series | Ceylon Journal of Science |
| spelling | doaj.art-702ac13a76fc452087f441a9359ad09e2022-12-22T04:38:36ZengFaculty of Science, University of Peradeniya, Sri LankaCeylon Journal of Science2513-28142513-230X2022-09-0151322924510.4038/cjs.v51i3.80315938Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and seasonL. Suriyagoda0T. Illangakoon1S. Wijerathna2U. Devasinghe3University of Peradeniya, PeradeniyaRice Research and Development Institute, Bathalagoda, IbbagamuwaRajarata University of Sri Lanka, PuliyankulamaRajarata University of Sri Lanka, Puliyankulama<div class="page" title="Page 2"><div class="layoutArea"><div class="column"><p><span>Growing degree-days (DD- °C days) required to complete growth phases in plants is generally considered as a constant. However, this practice has recently been questioned. Therefore, we tested the DD requirement for the growth phases of three Sri Lankan rice varieties, Bg300, Bg352 and Bg358. These rice varieties are widely cultivated in Sri Lanka across years, seasons and locations. When averaged across seasons, years and locations, the DD required for heading and maturity of Bg300 were 1,051 and 1,543 °C days, while those of Bg352 were 1,098 and 1,627, and Bg358 were 1,203 and 1,698 °C days, respectively. Moreover, DD required for heading and maturity varied among locations. Number of days required for heading and ripening correlated negatively, </span><span>i.e</span><span>., reducing ripening duration by 8.4 h due to the delay in heading by one day. Further, DD required for heading and maturity were positively correlated with the mean seasonal minimum and maximum temperatures. Therefore, crop duration could not be lowered as expected under warming climates. Hence, genotype × environment dependent DD requirements of rice varieties need to be considered when making agronomic and policy decisions in both regional and seasonal scales, and increasing the precision of phenology predictions.</span></p></div></div></div>https://cjs.sljol.info/articles/8031development, growing degree-days, spatial variation, seasonal variation, thermal time |
| spellingShingle | L. Suriyagoda T. Illangakoon S. Wijerathna U. Devasinghe Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season Ceylon Journal of Science development, growing degree-days, spatial variation, seasonal variation, thermal time |
| title | Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season |
| title_full | Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season |
| title_fullStr | Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season |
| title_full_unstemmed | Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season |
| title_short | Degree-day requirement for heading and maturity of three most popular rice varieties in Sri Lanka as influenced by location and season |
| title_sort | degree day requirement for heading and maturity of three most popular rice varieties in sri lanka as influenced by location and season |
| topic | development, growing degree-days, spatial variation, seasonal variation, thermal time |
| url | https://cjs.sljol.info/articles/8031 |
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