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在美国,大多数商用甘薯是利用膨大了的贮藏根来繁殖秧苗。秧苗繁殖的特点随栽培品种而定。把生产有利用价值秧苗的数量提高到最大限度,同时把生产它们所需要的时间降到最低限度,可减轻育秧成本,便于提早移栽。尽管小贮藏根的产苗量常常少于大贮藏根的,然而通常却喜欢用小薯块排种,因后者比等量大薯块的产秧量多。催芽处理能增加早秧的产量。为了检查其薯块内部品质,可以把薯块切成薄片,而后将该薯块的近顶梢排种育苗。该方法可彻底评价其內部品质,但在很大程度上却削减了贮藏根的产苗潜力。在佐治亚州,很多栽 相似文献
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甘薯一段苗(带顶尖的0~25 cm)及二段苗(25~50 cm)试验结果表明:一段苗的薯干粗淀粉含量极显著高于二段苗,一段苗有利于提高迷你薯比率,而二段苗有利于提高大中薯率。在3个甘薯品种中,广薯87一段苗的单株结薯数、薯干产量、淀粉产量和鲜薯产量分别比二段苗提高51.7%、38.7%、41.9%和20.2%,前三者达显著差异;广薯79一段苗的鲜薯产量、薯干产量和淀粉产量分别比二段苗提高15.3%、11.9%和20.0%;相反,普薯24二段苗的单株鲜薯重、鲜薯产量、薯干产量和淀粉产量分别比一段苗提高12.0%、12.0%、15.7和11.8%。因此,应针对不同甘薯品种一段苗和二段苗的生长特性以及市场目标来择优选用。 相似文献
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种薯生理成熟对早播马铃薯芽生长和产量的影响Subratakroy等著那凤琴译马铃薯(SolanumtuberosumL.)在印度西北平原9月份播种,早期生长阶段易遭遇平均29℃左右的高温。高温下生长的植株细弱、叶小,产量下降(Kushwah和Govi... 相似文献
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早熟甘薯鲜薯产量与其相关因素的灰色关联度分析 总被引:1,自引:0,他引:1
应用灰色系统理论中关联度分析法对7个早熟甘薯品种的6个相关因素与鲜薯产量的关联度分析,结果表明甘薯早熟品种与其相关因素的的关联度排列顺序依次为:上薯率r5,藤叶重r3,一次分枝数r2,烘干率r6,最长蔓长r1,结薯数r4。明确了各因素对鲜薯产量影响的主次关系,为选育早熟高产甘薯品种提供了理论依据。 相似文献
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移栽与直播对油菜根系建成及籽粒产量的影响 总被引:3,自引:0,他引:3
为深入理解根系调控在轻简化栽培技术中的作用,以甘蓝型油菜品种中双11号和中油杂12号为材料,通过设置直播(4.5万株/公顷)和移栽(12万株/公顷)两种栽培方式,高氮和低氮两种施肥方式的田间试验,从群体的角度研究了油菜的根系分布特征。结果表明,直播油菜根系比移栽油菜分布更深,直播油菜在0~10cm土层的根系分布显著低于移栽油菜,但在10~20cm和20~30cm土层的根系显著高于移栽油菜;初花期根干重是决定油菜群体籽粒产量的主要因素,根干重越大,籽粒产量越高;粗壮的根系是油菜获得高产的关键,移栽油菜的根系比直播油菜更为粗壮,增施氮肥有助于根系的粗壮型生长。 相似文献
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甘薯‘胜利百号’根腐病株为何出现显蕾开花的研究未见报告。本文鉴定了茄病镰孢甘薯专化型[Fusarium solani(Mart)Sacc.f.sp.batatas McClure,简称FSB]引起甘薯‘胜利百号’根腐病和诱导其显蕾开花(图1,2)。就FSB的V100-93-06菌株室内接种‘胜利百号’的接种方法、对不同甘薯栽培型的致病性及其粗毒素对甘薯组培苗叶片,芽的萌发数量和根的影响进行了研究。结果表明。切根接种和针刺接种方法较好(图3),V100—93-06菌株对不同甘薯栽培型呈现不同的致病性(表1),其粗毒素能够使组培苗出现黄叶(图4,5A),抑制芽萌发,抑制根长度和数量(图5),并能够诱导和病原菌寄生相似的部分症状(表2)。 相似文献
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G. K. Shrestha 《Potato Research》1986,29(1):173-175
Summary Roots of 15-day-old sprouts detached from tubers of potato (Solanum tuberosum L.) cv., Local Red, were dipped for 1 min in a 0.25% solution of Ethrel (ethephon), Rootone-F (RF), or Transplantone (TP)
or in water and then planted in the field. Plants treated with RF and TP were significantly (P<0.05) taller, had heavier haulm, produced more leaves, and yielded more tubers than those of the control treatment with water,
ethephon had no effect. RF was significantly (P<0.05) superior to TP for all measured components except leaf number. 相似文献
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E. J. Allen 《Potato Research》1978,21(4):341-345
Summary Desprouting of physiologically old seed at planting delayed emergence but had no effects on final number of above-ground stems,
final number of tubers or leaf dry weight at the end of June. Tuber yields were reduced by desprouting throughout the harvesting
period. At the beginning of harvesting desprouted seed had no saleable yield. The results suggest that desprouting delays
but does not alter the morphology of plants, nor the growth pattern of physiologically old seed. 相似文献
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The effects of sulphur dioxide (SO2) and nitrogen dioxide (NO2), singly and in combination, on the shoot and root growth of two potato cultivars sensitive to these pollutant gases were determined using rooted cuttings in controlled conditions. Plants were exposed to 0.11 ppm SO2 and/or 0.11 ppm NO2 for 24 hours a day for 7 or 14 days. Kennebec plants had significantly lower root fresh and dry weights after 7 days in the mixture treatments and lower root fresh weight in the NO2 treatment. Russet Burbank plants were more sensitive to SO2 and NO2 than Kennebec. Russet Burbank plants had significantly reduced leaf area, and leaf, stem, and root fresh and dry weights after 7 and 14 days of mixture treatment, and the leaf to root dry weight ratio was higher than in control plants. The combination treatment and SO2 alone resulted in visible injury on leaves of both cultivars. Changes in tissue water concentration, decreased specific leaf area and decreased root growth suggested that SO2 and NO2 altered plant water status and interfered with partitioning of dry matter from the leaves to other plant parts. 相似文献