Fresh root fragments of Rumex crispus and Rumex obtusifolius , which initially contain 65–70% moisture, progressively lose moisture when desiccated under conditions matching summer weather in southeast England. The likelihood of shoot emergence and the time it took in glasshouse conditions were both affected by desiccation, with R. crispus the most affected up to 48 hr and R. obtusifolius slower to emerge after 48 hr. These effects converged after longer desiccation periods, and R. crispus entirely failed to emerge after 120 hr. The dry weight of emerged shoots was not significantly different between the species until they were desiccated for 96 hr, after which R. obtusifolius dry weight was significantly reduced. In outdoor trials, desiccation for 24 or 48 hr had a lesser effect on emergence in either species when fragments were planted at the soil surface or at up to a depth of 10 cm, compared to deeper plantings, but emergence was significantly lower in plantings at 15 or 20 cm. Emergence delays were not significantly different between the species until they were planted at 15 or 20 cm, when R. obtusifolius was slower to emerge than R. crispus , an effect exacerbated by increasing desiccation. Similar interactions of increasing soil depth and desiccation were found in reductions in dry weight, number of tillers and leaf area, with R. obtusifolius generally, but not exclusively, better able to withstand more extreme trial conditions. Our findings suggest that control of these highly troublesome weeds can be assisted by appropriate agricultural practices, notably exposing cut fragments to drying conditions followed by deep burial.

中文翻译：

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干燥对阔叶蒌(Rumex obtusifolius)和卷蒌(Rumexcrispus)根碎片再生的影响

刚开始含有 65% 到 70% 水分的 Rumexcrispus 和 Rumex obtusifolius 的新鲜根碎片在与英格兰东南部夏季天气相匹配的条件下干燥时会逐渐失去水分。芽出现的可能性和在温室条件下花费的时间都受到干燥的影响，R.crispus 在 48 小时内受影响最大，而 R.obtusifolius 在 48 小时后出现的速度较慢。这些影响在更长的干燥时间后收敛，并且在 120 小时后 R.crispus 完全没有出现。在干燥 96 小时之前，不同物种之间出现的芽的干重没有显着差异，此后，钝叶 R. obtusifolius 的干重显着降低。在户外试验中，与更深的种植相比，干燥 24 小时或 48 小时对两种物种的出苗影响较小，当碎片种植在土壤表面或深度为 10 厘米时，与更深的种植相比，但种植在 15 或 20 厘米处的出苗率显着降低. 直到它们被种植在 15 或 20 厘米时，这些物种之间的出苗延迟才没有显着差异，此时 R. obtusifolius 的出苗速度比 R.crispus 慢，这种影响因干燥程度的增加而加剧。在干重、分蘖数和叶面积的减少中发现了增加土壤深度和干燥的类似相互作用，R. obtusifolius 通常但不完全是能够更好地承受更极端的试验条件。我们的研究结果表明，适当的农业实践可以帮助控制这些非常麻烦的杂草，