ABSTRACT Two fodder beet (Beta vulgaris L.) cultivars (‘Rivage’ and SF Brigadier™) were evaluated in a field experiment to quantify the effect of cultivar and sowing date on growth physiology. The crops were sown on 19 September, 17 October, 17 November and 15 December in 2014. Crops were sequentially harvested and separated into storage root, leaf blade and petiole for analysis. Fodder beet growth was sigmoidal; the growth of leaf blades and petioles dominated the lag phase while storage root growth dominated the exponential phase. The appearance of the 25th leaf marked the beginning of the exponential phase. The maximum growth rate was not affected by the cultivar or sowing date. Total dry matter (DM) yield was the same for September- and October-sown crops (2444 ± 164 g DM m−2); showing little advantage of early sowing because cold temperatures slowed canopy development. The November- and December-sown crops produced 18% and 30% lower yield than the October-sown crops. ‘Rivage’ partitioned 5% greater DM to the storage root, an indication of greater sink strength, than SF Brigadier. Information on the pattern of growth can aid management decisions for optimising yield, and is valuable for the improvement of fodder beet models.

中文翻译：

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新西兰不同日期播种的两种饲料甜菜 (Beta vulgaris L.) 品种的作物生长发育动态

摘要 在田间试验中评估了两种饲料甜菜（Beta vulgaris L.）栽培品种（'Rivage' 和 SF Brigadier™），以量化栽培品种和播种日期对生长生理的影响。作物于 2014 年 9 月 19 日、10 月 17 日、11 月 17 日和 12 月 15 日播种。作物依次收获并分成贮藏根、叶片和叶柄进行分析。饲料甜菜生长呈 S 形；叶片和叶柄的生长主导滞后期，而贮藏根的生长主导指数期。第 25 片叶子的出现标志着指数期的开始。最大生长速度不受品种或播种日期的影响。9 月和 10 月播种的作物的总干物质 (DM) 产量相同（2444 ± 164 g DM m-2）；由于寒冷的温度减缓了冠层的发育，因此早期播种几乎没有优势。11 月和 12 月播种的作物比 10 月播种的作物产量低 18% 和 30%。与 SF Brigadier 相比，“Rivage”将 5% 的 DM 分配到存储根，这表明下沉强度更大。有关生长模式的信息可以帮助优化产量的管理决策，并且对于饲料甜菜模型的改进很有价值。