论文密度和整枝互作对鲁棉研28号棉铃时空分布影响是关于本文可作为相关专业棉铃论文写作研究的大学硕士与本科毕业论文棉铃虫的防治论文开题报告范文和职称论文参考文献资料。
摘 要：抗虫棉常规精细整枝,早衰严重,劳动效率低.低密度下棉花整枝高大松散,单株成铃多,单位面积成铃少；高密度棉花整枝紧凑矮小,底部烂铃多.对此,通过裂区试验研究鲁棉研28号不同密度不同整枝条件对其成铃时空分布的影响.结果表明：低密度条件下“四桃”铃数明显高于高密度,差异显著；不同整枝栽培成铃主要集中在伏桃和早秋桃,简化整枝处理的伏桃和早秋桃数略少于其它整枝处理；随密度增加,单株棉花的下、中、上层棉铃数均出现不同程度的减少,密度和整枝互作对棉铃纵向分布影响更大,密度越高精细整枝、简化整枝处理的下层棉铃越少,在（3.0～4.5）万株/hm2密度范围内开心整枝处理的下层棉铃出现先增加后减少趋势；密度的变化对不同整枝处理的横向成铃影响不大.鲁棉研28号3.0万株/hm2开心整枝种植,其成铃在时间和空间分布上更加合理,更易结成优质棉铃,提高棉花等级.
关键词：棉花；密度；整枝；时空分布
中图分类号：S562.04文献标识号：A文章编号：1001-4942（2016）09-0045-04
Abstract Insect-resistant cotton general fine pruning usually results in serious premature aging and low labor efficiency. Under the condition of low density, the cotton plant is tall and loose, the boll number per plant was high and that per unit area was low. The cotton plant is short and tight under the condition of high density, and there are many rotten bolls at the bottom. In this study, the effects of different densities and pruning methods on spatial and temporal distribution of bolls of SCRC 28 were researched by split plot experiment design. The results showed that under the condition of low density, the total number of pre-summer bolls, summer bolls, early autumn bolls and late autumn bolls was obviously higher than that under the high density condition, and the difference was significant. For different pruning methods, the bolls mainly formed in summer and early autumn. The number of summer bolls and early autumn bolls of simplified pruning treatment was slightly less than that of other treatments. With the increase of density, the roll number on the lower, middle and upper layers of cotton plant decreased on different levels. The interaction of density and pruning had bigger influences on the longitudinal distribution of bolls. The higher the density, the less boll number on the lower layer of cotton plant under fine pruning and simplified pruning treatment. In the density range of （30 000～45 000） plants/hm2, the boll number on the lower layer of cotton plant under open-centered pruning treatment showed the trend of firstly increased and then decreased. The change of density had little influence on the horizontal roll forming under different pruning treatments. When SCRC 28 was cultivated in density of 30 000 plants/hm2 with open-centered pruning method, the boll distribution on time and space was more reasonable, and it was more likely to form high quality bolls and improve the level of cotton.
KeywordsCotton； Density； Pruning； Spatial and temporal distribution
棉花生产受到气候、土壤、品种、栽培技术等因素的影响[1,2].其种植密度,不同地区有不同结论.在现有栽培技术条件下,棉花产量构成因素（单位面积株数、单株铃数和铃重）间存在着一定矛盾,即群体和单株之间的矛盾.有关研究认为,增加棉花群体总铃数是提高棉花产量的关键因素,在一定范围内,棉花产量的高低,主要决定于单位面积总铃数.
总结:本文是一篇关于棉铃论文范文，可作为相关选题参考,和写作参考文献。
参考文献：
1、 机采棉最佳种植密度 摘要 为了探索和研究分析机采棉新陆早42号棉花品种的种植密度，通过试验确定最适宜的栽培密度。结果表明，实际种植密度在21 990 0万～26 8。
2、 镁铝互作对甘蔗根系影响 摘 要 为了明确镁铝互作对甘蔗根系的影响，以甘蔗品种YT55为材料，通过简单钙溶液培养的方法，分析在不同浓度铝、镁处理下，甘蔗根的相对伸长率、抗。
3、 鲜食和淀粉加工兼用型糯玉米品种鲁星糯1号选育和应用 摘要：鲜食与淀粉加工兼用型糯玉米新品种鲁星糯1号，是以N46119为母本、B108为父本组配育成，具有高产稳产、商品性好、抗逆性强、适应性广等特。
4、 互金专项整治办立即暂停批设网络小贷 11月21日晚间，互联网金融风险专项整治工作领导小组办公室下发《关于立即暂停批设网络小额贷款公司的通知》，通知要求各省整治办速将此文件精神传达到。
5、 棉全球史 1“野树上长出的羊毛”棉花走向全球14世纪英国作家、旅行家约翰·曼德维尔爵士罕有地提到了1320年代他在所谓的亚洲旅行中确实可信的观察所得。
6、 澳大学生研金创药夺互联网金奖 澳门大学中医药创业团队研发的新颖产品“金创药”，凭借其创意与扎实的科学基础，於第三届中国“互联网+”大学生创新创业大赛总决赛中脱颖而出，获评委一。