Effects of Root-trimming and Cutting-heights on Growth Performance of Potted Native Warm-season Grasses

Abstract

Mechanized transplanting of native warm-season grass (NWSG) seedlings raised in biodegradable strip-cups may require trimming outgrown and entwined roots to facilitate individual placement and complete root covering. During establishment, mowing is often used to reduce weed competition and promote tillering. In two randomized complete block split-split-plot design experiments, effects of root-trimming and cutting-height on growth and biomass production of potted NWSGs [big bluestem (BB, Andropogon gerardii Vitman), eastern gamagrass (GG, Tripsacum dactyloides L.), indiangrass (IG, Sorghastrum nutans L.), and switchgrass (SG, Panicum virgatum L.)] were assessed. Six-week old seedlings were transplanted, with or without root-trimming, and four of each type and species, assigned to 10-, 15-, or 20-cm cutting-height. All plants were fertilized uniformly and watered sufficiently. After a 7-d adjustment period, plants were clipped to 10 cm which promoted tillering. A three-week regrowth was then allowed before the first of three forage harvests, at assigned cutting-heights. Plant heights were recorded every two weeks after transplanting and on each harvest date. Data  were analyzed for effects of root-trimming, cutting-height, and species. Root-trimming had no effect on the parameters. Cutting-height had no effect on plant heights except for second GG and SG regrowths, and/or the third BB and SG. Cutting-height affected only SG forage biomass significantly ( P 100%, but with similar root:total biomass ratios. Overall, species yield increased in the order; IG

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修剪根高对盆栽原生暖季草生长性能的影响

在可生物降解条形杯中种植的本地暖季草(NWSG)幼苗的机械化移栽可能需要修剪长出的和缠绕的根，以方便个别放置和完全覆盖根。在建立过程中，割草通常用于减少杂草竞争和促进分蘖。通过2个完全随机分组-分块-分块设计试验，研究了修剪根系和刈割高度对盆栽NWSGs[大蓝茎(BB, Andropogon gerardii Vitman)、东部野草(GG, trisacum dactyloides L.)、印度草(IG, Sorghastrum nutans L.)和柳枝稷(SG, Panicum virgatum L.)]生长和生物量的影响。移植6周大的幼苗，有或没有修剪根部，每种类型和物种各4个，分别被分配到10、15或20厘米的扦插高度。所有的植物都均匀施肥并充分浇水。经过7 d的调整期后，将植株修剪至10 cm，促进分蘖。然后在三次牧草收获的第一次之前，在指定的切割高度上进行三周的再生。移栽后每两周和每个收获日记录植株高度。分析了根系修剪、扦插高度和种数的影响。修剪根系对各参数无影响。除第二次GG和SG再生和/或第三次BB和SG再生外，扦插高度对株高没有影响。刈割高度仅显著影响SG牧草生物量(P为100%)，但对根与总生物量的影响相似。总体上，物种产量依次增加;IG < BB < < SG GG。结果表明，在土壤水分和肥力充足的情况下，修剪根系不会影响NWSGs的生长和生物量。在nwsg建立期间，每隔≥3周刈割3次，每次刈割20厘米，可能不会对恢复生长或地下生物量产生负面影响。在提出实际的设施管理建议之前，需要实地研究的结果。

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