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Base temperatures affect accuracy of growing degree day model to predict emergence of bermudagrasses
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-03-27 , DOI: 10.1002/agj2.20660
M. Giolo 1 , R. Sallenave 2 , C. Pornaro 3 , C. Velasco‐Cruz 4 , S. Macolino 3 , B. Leinauer 4
Affiliation  

The germination of bermudagrass [Cynodon dactylon (L.) Pers.] under different temperature regimes has been extensively investigated, but a discrepancy remains between laboratory studies and field results. Thermal requirements calculated in growing degree days (GDD) have been found to differ within the same species depending on the location of the study. The accumulation of GDD may vary under different thermal conditions from seeding to seedling emergence and could depend on TBASE used in the calculation. The most widely used TBASE for bermudagrass is 5 °C. However, laboratory studies have suggested that a base temperature of 15 °C would more accurately predict seedling emergence. In this field study, we investigated the effect of using TBASE 5 °C vs. TBASE 15 °C on the estimation of GDD required by bermudagrass to emerge. Ten cultivars were seeded in northeastern Italy on three dates between 10 March and the end of April in 2013 and 2014. Number of emerged seedlings was counted weekly and soil temperature at 1-cm depth was recorded significant differences in seedling emergence between bermudagrass genotypes were found. Results demonstrated that the algorithm used to calculate GDD is strongly influenced by the TBASE used and to include a TBASE of 15 °C explains germination and emergence more accurately than a TBASE of 5 °C.

中文翻译:

基础温度影响生长期日模型预测狗牙根出现的准确性

狗牙根 [ Cynodon dactylon (L.) Pers.] 在不同温度条件下的萌发已被广泛研究,但实验室研究和现场结果之间仍然存在差异。已发现,根据研究地点的不同,在同一物种内以生长期 (GDD) 计算的热量需求有所不同。从播种到出苗的不同热条件下,GDD 的积累可能会有所不同,并且可能取决于计算中使用的T BASE。使用最广泛的T BASE百慕大草的温度为 5 °C。然而,实验室研究表明,15 °C 的基础温度可以更准确地预测幼苗的出苗。在这项实地研究中,我们研究了使用T BASE 5 °C 与T BASE 15 °C 对估计狗牙根出现所需的 GDD 的影响。在 2013 年和 2014 年 3 月 10 日至 4 月底的三个日期,在意大利东北部播种了 10 个品种。每周计算出苗数,并记录 1 厘米深度的土壤温度,发现百慕大基因型之间出苗率存在显着差异. 结果表明,用于计算 GDD 的算法受到所使用的T BASE 的强烈影响,并且包括Ť BASE 15℃更准确地解释发芽和出苗比Ť BASE 5℃。
更新日期:2021-03-27
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