The use of thermal time to model common lambsquarters (Chenopodium album) seedling emergence in corn

被引:26
作者
Leblanc, ML [1 ]
Cloutier, DC
Stewart, KA
Hamel, C
机构
[1] Inst Rech & Dev Agroenvironm, St Hyacinthe, PQ J2S 7B8, Canada
[2] Inst Malherbol, Ste Anne De Bellevue, PQ H9X 3R9, Canada
[3] McGill Univ, Dept Plant Sci, Ste Anne De Bellevue, PQ H9X 3V9, Canada
[4] Agr & Agri Food Canada, Swift Current, SK S9H 3X2, Canada
关键词
degree days; heat sum; temperature; thermal time; thermal units; weed emergence; weed emergence modeling;
D O I
10.1614/P2002-108
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 [作物学];
摘要
A mathematical model was developed to predict common lambsquarters seedling emergence in southwestern Quebec. The model was based on the thermal-time concept, using air temperatures in the double-sine calculation method. The model was built using data from five experiment-years for corn naturally infested with weed populations. Once developed, the model was calibrated using different crop seedbed preparation times. The base temperature was then adjusted for each time of seedbed preparation. A power regression function was used to relate adjusted base temperatures and the accumulated thermal units at seedbed preparation time. A modified Weibull function was then fitted to the field emergence data, expressed as the cumulative proportion of the total seedling emergence over the growing season as a function of cumulative thermal units. The simplicity and accuracy of this model would make it an excellent tool to predict common lambsquarters seedling emergence in field situations, facilitating the determination of the timing of scouting in integrated weed management systems.
引用
收藏
页码:718 / 724
页数:7
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