Growth of Torpedograss from Rhizomes Planted under Flooded Conditions 1
Growth of Torpedograss from Rhizomes Planted under Flooded Conditions 1
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淹水条件下种植的根茎鱼雷草的生长 1
DOI：
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发表时间：
1996
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影响因子：
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通讯作者：
D. Sutton
中科院分区：
文献类型：
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作者：
D. Sutton
本文报道了红柳（Panicum repens L.）将具有三至四个发育良好的芽的根茎种植在具有控释肥料的充满沙子的浸水容器中，导致100%存活。在南佛罗里达，这些根茎在室外培养16周，在种植后的前4周内仅产生总生物量的2%。最快的增长发生在8至12周时，39%至52%的总生物量产生。根，其中包括根茎，包括从39至55%的总植物生物量。然而，较高的根冠比与较低的施肥量有关。总干重为26至52克/容器后，16周的容器中的植物与肥料在2.5克/330厘米2的低利率。最高的干重发生在夏季时，656克生产的植物在40克肥料每330厘米2。基于代表种植根茎的初始干重，这一高速率表示在16周期间重量增加了728倍。生物量没有增加的肥料量高于40克率。在淹水条件下种植根茎后，生长有一个最初的滞后期，持续4周。然而，一旦根状茎建立，生长继续在夏季或冬季条件下的砂培养基的肥力取决于快速。这些数据表明，用于控制鱼雷草问题的除草剂处理必须杀死所有的根茎，因为一些节点具有在短时间内产生大量植物材料的潜力。
Sections of torpedograss ( Panicum repens L.) rhizomes with three to four well-developed buds planted in flooded, sand-filled containers with controlled release fertilizer resulted in 100% survival. For these rhizomes cultured outdoors for 16-weeks in south Florida, only 2% of the total biomass was produced during the first 4 weeks after they were planted. The most rapid growth occurred between 8 and 12 weeks when 39 to 52% of the total biomass was produced. Roots, which included the rhizomes, comprised from 39 to 55% of the total plant biomass. However, higher root to shoot ratios were associated with lower rates of fertilizer. Total dry weight was 26 to 52 g per container after 16 weeks for plants in containers with fertilizer at a low rate of 2.5 g per 330 cm 2 . The highest dry weight occurred during the summer when 656 g were produced by plants at 40 g of fertilizer per 330 cm 2 . Based on initial dry weights representative of rhizomes planted, this high rate represents a 728-fold increase in weight during the 16-weeks. Biomass was not increased by amounts of fertilizer higher than the 40-g rate. There was an initial lag phase of growth that lasted 4 weeks after planting the rhizomes under flooded conditions. However, once the rhizomes became established, growth continued at a rapid rate under both summer or winter conditions depending on fertility of the sand culture medium. These data show that herbicide treatments for control of torpedograss problems must kill all the rhizomes since a few nodes have the potential to produce a large amount of plant material in a short period of time.