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棉花叶枝数与种植密度对单株结铃数的影响 总被引：1，自引：1，他引：0
为了探明棉花叶枝数和密度对单株结铃的影响规律，试验设置5种留叶枝方式：不留叶枝（CK）、留1叶枝、留2叶枝、留3叶枝、留全部叶枝；5个种植密度（万株·hm－2）：2.25，3.00，3.75，4.50，5.25。研究结果表明：在同一密度条件下，随叶枝的增多，单株铃数增加；留1叶枝单株铃数较对照增加10%左右，留2、3叶枝单株铃数较对照增加15%左右，保留全部叶枝较对照增加25%左右。在同一叶枝处理下，随密度的增加，单株铃数减少；密度每增加7500株·hm－2，5种留叶枝方式的单株结铃分别减少2.60个、3.04个、3.06个、3.44个和3.71个。总铃数随叶枝和密度的增加而增加，当总成铃为88.24万个·hm－2时产量最高。 相似文献
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设置4个种植密度(3.0、3.75、4.5、5.25万株·hm-2)和5种叶枝处理方式(不留叶枝、留1个叶枝、留2个叶枝、留3个叶枝、留全部叶枝),研究不同密度和叶枝数量对冀丰914皮棉产量、铃重、衣分及成铃数的影响。结果表明:不论果枝铃重还是叶枝铃重均随叶枝的增加而下降;总成铃数随密度的增加而增加。衣分与密度、叶枝数量无显著相关性。密度对皮棉产量有显著影响,叶枝数量对皮棉产量影响不显著。在不同叶枝条件下,皮棉产量的最高值出现在不同密度:不留叶枝条件下,密度5.25万株·hm-2时产量最高;留1～3叶枝,密度4.5万株·hm-2时产量最高;留全部叶枝时,2015年密度在3.75万株·hm-2皮棉产量最高,2016年密度在4.5万株·hm-2产量最高。在低密度(3.0万株·hm-2)时保留叶枝对产量有较好的补偿作用。冀丰914在4.5万株·hm-2密度下保留1～3个叶枝能获得较高产量。 相似文献
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湘杂棉8号不同密度下性状及产量品质表现 总被引：1，自引：0，他引：1
对不同密度下湘杂拂8号农艺性状、产量构成和纤维品质进行研究。结果表明：果枝数、果节数、单株成铃数、成铃率均随着密度的增加而逐渐降低;12000株,hm^2处理的籽棉、皮棉产量,成铃数／hm^2最低。30000株/hm^2产量最高,39000株/hm^2次之,适宜密度为301300—39000株/hm^2;各处理间棉圩维平均长度、比强度、伸长率差异不显著,21000株／hm^2处理的整齐度最高,为85．19％。12000株/hm^2处理整齐度最低,为84．38％。 相似文献
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本研究于2018年在湖南长沙进行,以湖南农业大学选育的JX0010为供试材料,在短季直播栽培模式下设置了五个种植密度,分别是A1为30000株/hm^2,A2为60000株/hm^2,A3为90000株/hm^2,A4为120000株/hm^2,A5为150000株/hm^2。通过对棉花的产量性状和品质性状考察,探讨短季直播栽培种植密度对产量和品质的影响。结果表明:种植密度对棉花总铃数、棉纤维上半部平均长度、断裂比强度的影响大,其中总铃数表现为随密度增加先增加后减少,A4处理拥有最高的群体成铃数量,为117.2万个/hm^2;纤维上半部平均长度A5>A1>A4>A3>A2,且在A2~A5之间时随着种植密度的增加纤维长度而变长,以A5处理最长,为28.10mm;纤维的断裂比强度随着密度的增加呈先减小后增大趋势,A3处理的值最低,A1处理有着最高的棉纤维断裂比强度,为28.4cN/tex。对衣分和纤维整齐度的影响不显著,对铃重、马克隆值的影响没有趋势性,对棉纤维伸长率无影响。本试验中,密度为120000株/hm^2时籽棉产量和皮棉产量最高,分别为5983.79kg/hm^2、2217.64kg/hm^2,可作为棉花短季直播栽培的参考密度。 相似文献
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以湘杂棉8号品种,设6个不同密度处理3次重复,从纵向、横向和圆锥体顺序比较其成铃分布状况。结果表明：各处理成铃率下部高于中部、中部高于上部;内围铃高于外围铃;单株成铃率以12000株/hm^2成铃率最高为42．6％,57000株/hm^2成铃率最低为28．2％;圆锥体成铃率,第1圆锥体以12000株/hm^2和21000株/hm^2两处理的成铃率最高,达到90％,第2、3圆锥体成铃率以12000株／hm^2、21000株／hm^2成铃率高,均超过70％,第4．10圆锥体成铃率随着密度、圆锥体序数的增加而逐渐降低,12000株／hm^2在第5圆锥体的成铃率达到50％以上。 相似文献
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本研究采用二次回归组合设计的最优混合设计(311设计)，在湖南特殊的环境条件与栽培技术体系下探讨了栽培因子对棉株不同座果点蕾花铃的影响．即伏前桃在总铃数中所占的比例随播期推迟而减少，随密度增大而略有增加，施氮量过多或过少均减少伏前桃的比例：秋桃的比例随播期推迟而增加，随密度增大反而降低，随施氮量的增加而增加，伏桃在总铃敷中的比例最高，各个处理平均达到62％左右。根据三桃的总数与比例得出处理3为较好的栽培模式，即播期为4月9日，密度为19755株／hm^2，施氮量为337．5kg／hm^22。 相似文献
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针对豫北地区的大豆生产现状，从气候、土壤、品种、生态因素及市场需求等方面提出了优质大豆的发展策略与途径。 相似文献
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Irrigation of Netted Gem potatoes was scheduled during three growing seasons by three methods: (a) when plants displayed first visual symptoms of moisture stress, (b) when indicated by a soil moisture budget involving estimated evapotranspiration, and (c) on the basis of tensiometer readings of soil moisture suction. When the tensiometer method of scheduling was used, the mean yields of tubers were 55.0 and 25.8 cwt/acre (6160 and 2890 kg/ha) higher than those obtained with the other two scheduling methods. Methods did not affect the specific gravity of potatoes. Method (a) scheduled irrigations least frequently. Scheduling by the budget method was not always adequate because it was based on the assumption that the crop extracted water from a constant 4 ft (1.2 m) profile from planting to full vegetative growth. In one year the budget method scheduled the first irrigation earlier than necessary and delayed the second irrigation during a critical period of crop growth. From full vegetative cover to harvest the irrigation schedules were alike for both the budget and tensiometer methods. 相似文献
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以长沙县高桥相同嫩度茶鲜叶原料采用卷曲形毛尖茶加工工艺制绿茶为对照,分别对沅陵县齐眉翠峰、凤娇碣滩茶、干发茶和军大坪茶4种绿茶的主要生化成分与感官品质进行初步分析。结果表明,沅陵4种绿茶的茶多酚总量28.76%~30.34%,游离氨基酸总量2.35%~3.22%,咖啡碱含量3.00%~3.63%,水浸出物含量37.26%~40.07%,可溶性糖总量5.46%~5.65%,可溶性蛋白含量1.50%~1.74%,类黄酮化合物总量1.16%~1.79%,叶绿素总量1.36%~2.01%,儿茶素总量13.53%~16.20%。与对照相比,4种绿茶的茶多酚、可溶性糖和儿茶素总量均高于对照,除齐眉翠峰外其余3种茶样水浸出物和叶绿素总量均高于对照,除干发茶外其余3种茶样类黄酮化合物总量均高于对照。 相似文献
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1 吉林省平安农业科学院大豆研究工作简介吉林省平安农业科学院大豆研究所 ,设在吉林省长春市西安大路种子大厦内。现有科技人员 6人 ,其中研究员 2人 ,农艺师 2人 ,技术员 2人 ,定向培养研究生 2人。大豆研究所的主要任务是选育稳产、高产、优质及抗病虫大豆新品种 ;同时密切 相似文献
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Sena L.P. VanderJagt D.J. Rivera C. Tsin A.T.C. Muhamadu I. Mahamadou O. Millson M. Pastuszyn A. Glew R.H. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(1):17-30
In the western Sahel, indigenous plants become important staples when cereal harvests are inadequate to support populations inhabiting that region of Africa. The purpose of this study was to assess the nutrient content of several of these edible wild plants. The leaves of the following seven plant foods were analyzed: Ziziphus mauritiana, Cerathotheca sesamoides, Moringa oleifera, Leptadenia hastata, Hibiscus sabdarifa, Amaranthus viridi, and Adansonia digitata. The fatty acid, vitamin E, carotenoid, selected mineral and amino acid contents of these plant foods were determined. These same analyses were performed on the fruit of the Adansonia digitata. In quantitative and qualitative terms, Amaranthus viridis was found to be an excellent source of protein. Its amino acid composition compared favorably to that of a World Health Organization (WHO) protein standard. It also contained considerable amounts of the two fatty acids that are essential in humans (linoleic and -linolenic) and a number of minerals including iron, magnesium, calcium and zinc. The leaves of Hibiscus sabdarifa contained an appreciable quantity of protein the composition of which was comparable to the WHO standard. The mineral content of the leaves of this plant was also exceptionally high; noteworthy was its high zinc content. H. sabdarifa also contained significant quantities of the two essential fatty acids. Ziziphus mauritiana was an excellent source of the essential fatty acid linoleic acid and several of the metals including iron, calcium, magnesium and zinc. Its content of other essential nutrients, however, was rather low. In general, Adansonia digitata leaves were nutritionally superior to the fruit of the tree; however, the fruit did contain useful quantities of potassium, phosphorus, zinc and -linolenic acid. The Leptadenia hastata leaves were an especially good source of lutein and -carotene. These data should be useful to the people who inhabit the western Sahel in helping them devise healthy diets during times when cereal staples are in short supply. 相似文献
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通过电解质外渗法和匍匐茎恢复试验对‘阳江’狗牙根及其12个通过形态鉴定选出的坪用价值高且花序密度低的诱变后代进行抗寒性鉴定。电解质外渗法结果表明:诱变后代间的抗寒性具有较大差异,其叶片半致死温度(LT50)的变异范围为-7.6～-0.2℃(最低值与最大值相差7.4℃);参试材料抗寒性由强到弱依次为M18>M4>M26>M28> M22>阳江>M29>M31>M10>M37>M16>M1>M25,其中,有5个诱变后代抗寒性优于亲本,分别是M18、M4、M26、M28、M22。匍匐茎恢复实验结果表明:诱变后代M1、M22、M26、M31、M25在0℃和-5℃低温胁迫后的恢复生长率都高于亲本,恢复能力均优于亲本;M10、M37、M28在-5℃低温胁迫下,恢复生长能力低于亲本,抗寒性相对较弱,M16和M4在0℃和-5℃低温胁迫下,恢复生长率都低于亲本,抗寒性明显弱于亲本。综合2种方法鉴定结果显示:诱变后代M1、M25的恢复能力较强;M4、M28的叶片抗寒性较好,青绿期较长;M22、M18、M26的叶片抗寒性和匍匐茎恢复能力均较强;M29,M31的叶片抗寒性和匍匐茎恢复能力与亲本相似;M10、M16、M37的叶片抗寒性和匍匐茎恢复能力均较弱,整体抗寒性较弱。 相似文献
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