共查询到19条相似文献，搜索用时 312 毫秒
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为摸清不同处理方式对紫花松果菊种子萌发的影响,采用单因素随机区组试验设计,对引进的紫花松果菊[Echinacea purpurea,(L) Moench.]种子萌发特性进行研究.结果表明:1)在室内平均温度和湿度分别为25.3℃和80.6％时,种子经过稀释10倍、20倍和40倍的95％乙醇溶液浸泡处理5 min后进行萌发,其萌发率均达90％左右;2)在室内平均温度和湿度分别为27.4℃和74.3％的环境中,GA溶液浓度为5 mg/L时的萌发率最高(达41％),浓度超过5 mg/L的GA溶液对紫花松果菊种子的萌发无积极作用,相反还有抑制作用. 相似文献
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本文介绍了中药材松果菊操作规程基本要求,总结了松果菊规范化种植技术,包括品种介绍、育苗管理、大田管理、大田移栽、田间管理、病虫害防治、宿根地操作规程、采收加工等内容,以期为松果菊规范化种植提供指导。 相似文献
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[目的]研究"早稻-冬草莓"轮作模式最佳种植期.[方法]根据双流县气象局1971 ～ 2010年气象资料,采用滑移气候相似距及数理统计方法,对"早稻-冬草莓"轮作模式最佳种植期进行分析.[结果]冬草莓最佳种植期在8月1日～翌年3月31日,其小苗移栽最早在7月中旬,最晚在8月中旬,最佳移栽时期平均在8月19日.早稻移栽时间平均为3月26日,拟收获期平均为7月26日.[结论]从气象角度研究了"早稻-冬草莓"轮作模式最佳种植期,为双流县推广该模式,最大限度地发挥光、温、水、土地的生态效益提供了科学的决策依据. 相似文献
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卷丹百合(Lilium lancifolium Thunb.),作为一种极具经济价值的药用植物,具有广阔的应用前景和研究价值.在卷丹种植基础上,通过对卷丹百合物候期划分,种球分级、种植密度、种植模式、肥料、播种时期等关键技术的研究,建立了百合种植关键技术体系.结果 表明:卷丹百合物候期划分为8个时期;在研究范围内,种球分级为大种球(d≥5 cm)、种植模式为垄起渗水膜覆盖,种植密度为4500 kg·hm-2,基肥施肥量为225 kg·hm-2时,卷丹百合产量、多糖和皂苷含量较高. 相似文献
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播期和移栽密度对水稻甬优1540农艺性状及产量的影响 总被引：1，自引：0，他引：1
《浙江农业科学》2017,(12)
以水稻甬优1540为研究对象,在浦江县进行播期和移栽密度试验,研究其对甬优1540农艺性状及产量的影响,探索甬优1540在浙中地区的高产种植模式。试验结果表明,播种期推迟10 d,水稻全生育期缩短3 d,有效穗、成穗率与结实率相应减少,产量下降;水稻产量随着移栽密度的增大呈现先增高后降低的趋势,移栽密度过小,水稻成穗率较高,但有效穗偏少,不利于高产;移栽密度过大,有效穗较多,但成穗率下降,结实率偏低,同样不利于高产。根据试验结果,甬优1540在浙中地区的高产种植模式为5月10日左右播期,移栽密度18万·hm~(-2)。 相似文献
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为探讨高纬寒地不同水稻品种的适宜栽培密度,以早熟大穗型品种黑粳6号和极早熟9片叶品种黑粳5号为材料,研究了不同种植密度对水稻品种物候期、分蘖动态、叶面积、干物质积累和产量及其构成因素的影响。结果表明：黑粳6号最佳种植密度为28～34穴?m‐2即（26．4 cm ×13．2 cm或29．7 cm ×10．0 cm）;黑粳5号的为38穴?m‐2左右（26．4 cm ×10．0 cm）。不同品种的移栽密度变化对产量的影响很大,应该区别对待,以实现良种良法配套。 相似文献
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以高原高寒地区日光温室延后栽培红地球葡萄为试材,研究了其在果实膨大期、转色期和成熟期光合特性和叶绿素含量的变化。结果表明：不同物候期红地球葡萄净光合速率(Pn)日变化均呈双峰曲线变化趋势,有光合午休现象;从果实膨大期、转色期到成熟期,Pn日变化的峰值和均值逐渐降低;膨大期和成熟期Pn午休主要是非气孔限制所致,转色期Pn午休主要是气孔限制引起;日光温室延后葡萄栽培可以极大地提高葡萄WUE,冬季低温季节表现更明显;Chla、Chlb和Chl(a+b)含量均为膨大期＞转色期＞成熟期,成熟期Chlb表现显著下降;Pn同Chlb呈显著正相关关系。 相似文献
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Aituan Ma Wanyu Shi Xiaofei Niu Meng Wang Xiuhui Zhong 《Frontiers of Agriculture in China》2009,3(4):452-456
Echinacea purpurea is among the most widely used herbal medicines throughout Europe and North America for the prevention or treatment of infectious
diseases. However, there have been few reports on the effect of the herb in chickens. In order to investigate the immunomodulatory
effect of Echinacea purpurea in fowls, 150 seven-day-old broilers were randomly divided into five groups (30 in each group). Birds in Groups A, B, and
C were orally given Echinacea purpurea extract once a day at low (0.1 g, Group A), medium (0.5 g, Group B), and high (1 g, Group C) doses for seven days, while
Group D and Group E, assigned as control Group I and control Group II, respectively, were given distilled water in the same
amount as Groups A, B, and C. Broilers in Groups A, B, C, and D were normally immunized with infectious bursal disease (IBD)
vaccine at 14-day-old, whereas Group E was neither treated with Echinacea purpurea extract nor vaccinated. Results indicated that antibody titers were higher (P<0.01) in the three Echinacea purpurea extract treated groups (Groups A, B, and C) compared with Group D on days 21, 28, 35, and 42 after treatment. The antibody
titer raised more strikingly in groups treated with higher doses of Echinacea purpurea extract (0.5 g and 1 g) than lower dose (0.1 g). The IL-2 level in peripheral blood was significantly higher in Groups B
and C compared with Group D (P<0.01 on day 21 and P<0.05 on days 28 and 35). No significant difference was observed between Group A and Group D. The TNF-α content in Group B
was significantly higher than that of Group D (P<0.01 on day 21 and day 28, P<0.05 on day 35). Birds in Group C also showed a higher TNF-α content than Group D (P<0.05 at the three measuring dates). These results indicated that Echinacea purpurea extract significantly enhanced IL-2 and TNF-α production and antibody titers to the IBD vaccine. The Echinacea purpurea extract was also found to increase the feed conversion ratio. 相似文献
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[目的]综合分析移栽期、种植密度、施氮量与烤烟(Nicotiana tabacum L.)烟叶香型的关系。[方法]结合烟株农艺性状指标、抗病性、原烟外观质量、烟叶内在化学成分及产量、产值等经济效益指标分析,在植烟区开展烤烟不同移栽期(4月25日、4月30、5月5日)、种植密度(120 cm×40 cm、120 cm×50 cm、120 cm×60 cm)和施肥量(45、90、135 kg/hm2)的探索研究。[结果]不同移栽期、种植密度和施肥量对烤烟生长发育和产质量的影响十分显著。4月25～30日移栽的烤烟产质量好,尤其以移栽期为4月25日最好,种植密度为120 cm×60 cm和施氮量为135 kg/hm2的种植条件比较适合植烟区的烤烟生产。[结论]该研究可为烤烟定向栽培提供更好的生产技术方案和理论支持。 相似文献
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采用裂区试验设计,研究了肥料运筹和栽期对甘蓝型黄籽杂交油菜新品种"渝黄一号"超稀植产量及其有效性状的影响,寻找出产量4 157.1 kg/hm2(B2A2)和3 653.6 kg/hm2,加黄籽率93.2%(A1B2)的肥料运筹和栽期的最佳方案.10月12日栽(B2), A2的肥料运筹是N肥基∶追∶薹为5∶3∶2、PK基施;A1的肥料运筹是N肥基∶追∶腊:薹为5∶3∶1∶1,P肥基∶追∶腊为5∶4∶1,K肥追∶腊∶薹为3∶2∶5. 相似文献
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移栽和直播油菜的氮肥施用效果及适宜施氮量 总被引：10，自引：2，他引：8
【目的】研究氮肥施用对移栽油菜和直播油菜生长发育状况和籽粒产量的影响,探寻直播油菜的氮素营养特点,比较和明确两种种植方式下油菜氮肥施用效果和适宜施氮量的差异,为油菜科学施肥提供依据。【方法】2009—2010年度在湖北省沙洋县布置移栽油菜和直播油菜氮肥用量田间试验,开展田间调查和产量分析,根据肥效模型确定适宜施氮量。【结果】由于种植方式的不同,移栽油菜和直播油菜生育期内植株形态和生长发育特点存在较大差异。移栽油菜单株优势明显,植株各方面发育均好于直播油菜,而直播油菜具有群体优势,籽粒产量水平与移栽油菜接近。施氮有效促进移栽油菜和直播油菜的生长发育,显著提高油菜籽粒产量。同时,两种种植方式下油菜氮肥施用效果存在差异,移栽油菜各项生长发育指标及产量形成受氮素影响更为明显。直播油菜拥有庞大的根群结构,吸收土壤氮素的能力强,对外源氮肥需求量少于移栽油菜。本试验条件下,移栽油菜和直播油菜的适宜施氮量分别为228.4 kg•hm-2和130.3 kg•hm-2。【结论】移栽油菜和直播油菜的植株形态、生长发育及施氮效果存在明显差异,产量水平相近的情况下直播油菜氮肥适宜用量明显低于移栽种植。因此直播油菜的经济效益较高,具有较好的发展前景。 相似文献
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Effect of wide-narrow row arrangement in mechanical pot-seedling transplanting and plant density on yield formation and grain quality of japonica rice 
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下载免费PDF全文 HU Qun JIANG Wei-qin QIU Shi XING Zhi-peng HU Ya-jie GUO Bao-wei LIU Guo-dong GAO Hui ZHANG Hong-cheng WEI Hai-yan 《农业科学学报》2020,19(5):1197-1214
Mechanical pot-seedling transplanting is an innovatively developed transplanting method that has the potential to replace mechanical carpet-seedling transplanting. However, the initial pot-seedling transplanting machine lacked optimized density spacing and limited yield potential for japonica rice. Therefore, ascertaining the optimized density by wide-narrow rows and the appropriate transplanting method for yield formation and grain quality of japonica rice is of great importance for high-quality rice production. Field experiments were conducted using two japonica rice cultivars Nanjing 9108 and Nanjing 5055 under three transplanting methods in 2016 and 2017: mechanical pot-seedling transplanting with wide-narrow row(K, average row spacing of 30 cm); equidistant row(D, 33 cm×12 cm); and mechanical carpet-seedling transplanting(T, 30 cm×12.4 cm). In addition, five different density treatments were set in K(K1–K5, from 18.62×10~4 to 28.49×10~4 hills ha~(–1)). The results showed that the highest yield was produced by a planting density of 26.88×104 hills ha~(–1) in mechanical pot-seedling transplanting with wide-narrow row with a greater number of total spikelets that resulted from significantly more panicles per area and slightly more grain number per panicle, as compared with equidistant row, and yield among density in wide-narrow row showed a parabolic trend. Compared with mechanical carpet-seedling transplanting, the treatment of the highest yield increased yield significantly, which was mainly attributed to the larger sink size with improved filled-grain percentage and grain weight, higher harvest index, and increased total dry matter accumulation, especially the larger amount accumulated from heading stage to maturity stage. With the density in wide-narrow row decreasing, processing quality, appearance quality, and nutrition quality were all improved, whereas amylose content and the taste value were decreased. Compared with mechanical carpet-seedling transplanting, mechanical pot-seedling transplanting improved processing quality and nutrition quality, but decreased amylose content and deteriorated appearance quality. These results suggested that mechanical pot-seedling transplanting with wide-narrow row coupling produced a suitable planting density of 26.88×10~4 hills ha~(–1) and may be an alternative approach to improving grain yield and quality for japonica rice. 相似文献
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选择2种内蒙古草原的优势草种羊草和克式针茅,通过人工饲喂蝗虫取食的方法,分别测定亚洲小车蝗的5龄蝻期以及成虫在未施肥(ON)和施肥(HN)条件下对于2种不同草种的取食量和选择频次,并研究N元素变化对于亚洲小车蝗取食选择性的影响。结果表明,在蝻期,N元素不是其取食选择性和食量的决定因素。而在成虫期,亚洲小车蝗特别是雄性更喜欢低N植物作为其食物。亚洲小车蝗对羊草或针茅的选择取食随发育阶段、性别和草的N含量进行调整,但在进化过程中趋向于选择低氮的植物。 相似文献