Initial growth and development of southern sandbur based on thermal units
Availability of basic information on weed biology is an essential tool for designing integrated management programs for agricultural systems. Thus, this study was carried out in order to calculate the base temperature (Tb) of southern sandbur (Cenchrus echinatus), as well as fit the initial growth a...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira da Ciência das Plantas Daninhas
2014-06-01
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| Series: | Planta Daninha |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200011&tlng=en |
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| author | E.C.R. Machado R.S.O. Lima A.P.P. Silva B.S. Marques M.F. Gonçalves S.J.P. Carvalho |
| author_facet | E.C.R. Machado R.S.O. Lima A.P.P. Silva B.S. Marques M.F. Gonçalves S.J.P. Carvalho |
| author_sort | E.C.R. Machado |
| collection | DOAJ |
| description | Availability of basic information on weed biology is an essential tool for designing integrated management programs for agricultural systems. Thus, this study was carried out in order to calculate the base temperature (Tb) of southern sandbur (Cenchrus echinatus), as well as fit the initial growth and development of the species to accumulated thermal units (growing degree days - GDD). For that purpose, experimental populations were sown six times in summer/autumn conditions (decreasing photoperiod) and six times in winter/spring condition (increasing photoperiod). Southern sandbur phenological evaluations were carried out, on alternate days, and total dry matter was measured when plants reached the flowering stage. All the growth and development fits were performed based on thermal units by assessing five base temperatures, as well as the absence of it. Southern sandbur development was best fit with Tb = 12 ºC, with equation y = 0,0993x, where y is the scale of phenological stage and x is the GDD. On average, flowering was reached at 518 GDD. Southern sandbur phenology may be predicted by using mathematical models based on accumulated thermal units, adopting Tb = 12 ºC. However, other environmental variables may also interfere with species development, particularly photoperiod. |
| first_indexed | 2024-12-20T08:05:03Z |
| format | Article |
| id | doaj.art-1029996d833e46bf9e8bee5c3a9a9d2a |
| institution | Directory Open Access Journal |
| issn | 0100-8358 |
| language | English |
| last_indexed | 2024-12-20T08:05:03Z |
| publishDate | 2014-06-01 |
| publisher | Sociedade Brasileira da Ciência das Plantas Daninhas |
| record_format | Article |
| series | Planta Daninha |
| spelling | doaj.art-1029996d833e46bf9e8bee5c3a9a9d2a2022-12-21T19:47:26ZengSociedade Brasileira da Ciência das Plantas DaninhasPlanta Daninha0100-83582014-06-0132233534310.1590/S0100-83582014000200011Initial growth and development of southern sandbur based on thermal unitsE.C.R. Machado0R.S.O. Lima1A.P.P. Silva2B.S. Marques3M.F. Gonçalves4S.J.P. Carvalho5Instituto Federal do Sul de Minas GeraisInstituto Federal do Sul de Minas GeraisInstituto Federal do Sul de Minas GeraisInstituto Federal do Sul de Minas GeraisInstituto Federal do Sul de Minas GeraisInstituto Federal do Sul de Minas GeraisAvailability of basic information on weed biology is an essential tool for designing integrated management programs for agricultural systems. Thus, this study was carried out in order to calculate the base temperature (Tb) of southern sandbur (Cenchrus echinatus), as well as fit the initial growth and development of the species to accumulated thermal units (growing degree days - GDD). For that purpose, experimental populations were sown six times in summer/autumn conditions (decreasing photoperiod) and six times in winter/spring condition (increasing photoperiod). Southern sandbur phenological evaluations were carried out, on alternate days, and total dry matter was measured when plants reached the flowering stage. All the growth and development fits were performed based on thermal units by assessing five base temperatures, as well as the absence of it. Southern sandbur development was best fit with Tb = 12 ºC, with equation y = 0,0993x, where y is the scale of phenological stage and x is the GDD. On average, flowering was reached at 518 GDD. Southern sandbur phenology may be predicted by using mathematical models based on accumulated thermal units, adopting Tb = 12 ºC. However, other environmental variables may also interfere with species development, particularly photoperiod.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200011&tlng=enCenchrus echinatusweedbiologygrowing degree daysmodeling |
| spellingShingle | E.C.R. Machado R.S.O. Lima A.P.P. Silva B.S. Marques M.F. Gonçalves S.J.P. Carvalho Initial growth and development of southern sandbur based on thermal units Planta Daninha Cenchrus echinatus weed biology growing degree days modeling |
| title | Initial growth and development of southern sandbur based on thermal units |
| title_full | Initial growth and development of southern sandbur based on thermal units |
| title_fullStr | Initial growth and development of southern sandbur based on thermal units |
| title_full_unstemmed | Initial growth and development of southern sandbur based on thermal units |
| title_short | Initial growth and development of southern sandbur based on thermal units |
| title_sort | initial growth and development of southern sandbur based on thermal units |
| topic | Cenchrus echinatus weed biology growing degree days modeling |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200011&tlng=en |
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