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首页> 外文学位 >EFFECTS OF DELAYED HARVEST, CULTIVAR, AND BOLL TYPE ON WEATHERING DAMAGE TO YIELD-RELATED TRAITS AND FIBER QUALITY IN UPLAND COTTON.
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EFFECTS OF DELAYED HARVEST, CULTIVAR, AND BOLL TYPE ON WEATHERING DAMAGE TO YIELD-RELATED TRAITS AND FIBER QUALITY IN UPLAND COTTON.

机译：陆地棉收割，栽培品种和灌浆类型的延迟对天气相关性状的耐候性和纤维品质的影响。

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摘要

Scope of Study. The purpose of this research was to investigate the effects of delayed harvest, cultivar, and boll type on field deterioration of (i.e., weathering damage to) yield-related traits and fiber quality in upland cotton (Gossypium hirsutum L.). Four stormproof, four storm resistant, and four open-boll cultivars were utilized in this study over 3 years at a single location. Each year when plant growth had totally ceased, random samples of 15 mature bolls were taken from each plot at approximately 2-week intervals. Seven traits associated with yield and six fiber quality characteristics were studied using analyses of variance and regression techniques.;Findings and Conclusions. In most cases, cultivars having the same boll type displayed similar trends for weathering effects on traits associated with yield and fiber quality. Interactions of boll type with duration of pre-harvest weathering were significant in approximately half the possible instances, indicating that trends were frequently different among the three boll types studied. All yield-related traits were reduced by delayed harvests in at least 2 of the 3 years. Adverse effects of weathering on most traits were more serious in open-boll cultivars than in the other two boll types, especially when compared to the stormproof cultivars. Storm resistant cultivars generally displayed intermediate responses between the open-boll and stormproof types, but did not differ significantly from the stormproof types for any yield-related trait in any year. Significant differences between storm resistant and open-boll types were occasionally detected. The three boll types did not differ in the rates at which their lint and seed indexes were reduced by weathering. All fiber quality traits were reduced by delayed harvests in at least 2 of the 3 years. Differences in weathering trends among boll types were not as consistent for fiber quality as they were for the yield-related traits. Significant differences among boll types for such trends were not detected for 2.5% span length, micronaire, or T(,1) fiber strength. In one year, storm resistant and open-boll types lost uniformity index more rapidly than did stormproof cultivars. In another year, open boll cultivars suffered 50% span length reductions more rapidly than the other two; and open-boll cultivars lost T(,0) fiber strength more quickly than did the storm resistant types. The amounts of loss in each character that can be expected for each 2-week delay in harvest are provided for each boll type in this paper.
机译：研究范围。这项研究的目的是调查延迟收获，栽培品种和铃类型对陆地棉（陆地棉）产量相关性状的田间退化（即风化损害）和纤维品质的影响。在三年的研究中，在单个位置使用了四个防暴，四个防暴和四个开铃品种。每年植物完全停止生长时，每隔大约2周从每个地块中随机抽取15个成熟的棉铃样品。使用方差分析和回归技术研究了与产量相关的七个性状和六个纤维品质特征。结果与结论。在大多数情况下，具有相同铃类型的品种对与产量和纤维品质相关的性状表现出相似的风化趋势。棉铃类型与收获前风化持续时间的相互作用在大约一半的可能情况下是显着的，这表明在研究的三种棉铃类型之间趋势往往不同。在3年中的至少2年中，延迟收获会降低所有与产量相关的性状。风化对大多数性状的不利影响在开铃品种中比在其他两种铃类型中更为严重，特别是与防暴品种相比。抗暴品种通常在开铃和防暴类型之间表现出中间响应，但在任何一年中，与任何与产量相关的性状都与防暴类型没有显着差异。偶尔会发现防暴型和开铃型之间的显着差异。三种铃铃类型的皮棉和种子指数因风化而降低的速率没有差异。在3年中的至少2年中，延迟收获会降低所有纤维的质量特性。棉铃类型之间风化趋势的差异与纤维质量的一致性不如与产量相关的性状一致。对于2.5％的跨度长度，马克隆值或T（，1）纤维强度，未检测到这种趋势的棉铃类型之间存在显着差异。在一年中，抗风暴和开铃类型比抗风暴品种失去均匀指数的速度更快。在另一年中，开放铃的品种比其他两个品种的跨距减少更快，减少了50％。开铃品种比抗暴型品种损失的T（，0）纤维强度更快。本文针对每种铃铃类型，提供了每延迟两周收获可预期的每个字符损失的数量。

著录项

  • 作者

    RANJBAR, GHOLAM ABBAS.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Agriculture Agronomy.
  • 学位 Ph.D.
  • 年度 1980
  • 页码 55 p.
  • 总页数 55
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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