新疆南疆籽棉超高产机理研究     

娄善伟  帕尔哈提.买买提  王新江  杨涛  张鹏忠  赵小伊  何红  马腾飞  边洋  张巨松 《干旱地区农业研究》2015,33(2):32-39

为探寻新疆南疆地区籽棉9000 kg·hm-2超高产机理以及相关的指标,对南疆地区生态条件下超高产田、高产田、中高产田进行了调查研究与数据采集。研究发现:要获得超高产,首先要有良好的基础地力,有机质含量超10 g·kg-1,种植密度18×104~21×104株·hm-2为宜;其次,塑造良好株型,株高65~75 cm,茎粗接近10 mm,果枝9~10台,棉铃空间分布均匀,纵向上、中、下果枝棉铃比例3.2∶4.7∶2.1,横向第一、二果节比例7∶3,初花至盛铃LAI、SPAD、Pn一直维持较高水平,盛铃前后达到最大,后期下降缓慢;最后,氮磷钾分配上,前期差异不大,进入花铃期生殖生长明显增强,蕾花铃氮磷钾比例明显增大,一直维持到见絮,超高产处理的蕾花铃干物质量比例明显高于其它处理8%以上,见絮时蕾花铃干物质量达到了6 402 kg·hm-2。以指标数据作参考,塑造良好株型,协调棉铃空间分布,维持较高较长的光合速率,减缓LAI、SPAD下降速度,促进生殖生长,合理养分分配,便能实现产量目标。  相似文献   

China's Veneer Industry Comes of Age     

XIANG ER 《国际木业》2008,(4)

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新疆彩棉产业发展建议     

李雪源  王俊铎  郑巨云  艾先涛  吐逊江  多力坤  莫明 《中国棉花》2011,38(7):2-4

 围绕新疆彩棉产业的发展,从生产、科研、市场等方面提出了发展建议：（1）新疆彩棉生产应走环境友好、高效发展之路。（2）彩棉研发应着力创新,突破现有“局限性”。（3）彩棉市场应优化定位,立足于其商业性,实现销售量的提高。  相似文献   

A survey of skin neoplasms in dogs from the Brisbane region     

JC ER  RH SUTTON 《Australian veterinary journal》1989,66(7):225-227

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Selecting and evaluating the site for a veterinary hospital     

J Lovejoy 《The Veterinary clinics of North America》1972,2(3):571-579

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Museum collections and conservation efforts     

Kress WJ  Miller SE  Krupnick GA  Lovejoy TE 《Science (New York, N.Y.)》2001,291(5505):828-829

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Observation of transition-state vibrational thresholds in the rate of dissociation of ketene     

Lovejoy ER  Kim SK  Moore CB 《Science (New York, N.Y.)》1992,256(5063):1541-1544

Rate constants for the dissociation of highly vibrationally excited ketene (CH(2)CO) have been measured at the threshold for the production of CH(2)((3)B(1)) and CO((1)Sigma(+)). The rate constant increases in a stepwise manner with increasing energy, consistent with the long-standing premise that the rate of a unimolecular reaction is controlled by flux through quantized transition-state thresholds. The data give the energies of the torsional and C-C-O bending vibrations of the transition state.  相似文献   

Fortification of pork loins with docosahexaenoic acid(DHA) and its effect on flavour     

William  J  Meadus Tyler  D  Turner Michael  ER Dugan  Jennifer  L  Aalhus Pascale  Duff David  Rolland Bethany  Uttaro Lorna  L  Gibson 《畜牧与生物技术杂志(英文版)》2014,(1):106-113

Pork is traditionally low in docosahexanoic acid(DHA, C22:6n-3) and deficient in omega-3 fats for a balanced human diet. DHA as triglycerides was commercially prepared from the microalgae Schizochytrium and injected into fresh pork loins. Treatments of a mixed brine control(CON), 3.1% sunflower oil in mixed brine(SF) and a 3.1% DHA oil in mixed brine(DHA) were injected into pork loins at 10 mL/100 g and grilled at 205°C. After cooking, the CON and SF pork loins contained 0.03 to 0.05 mg DHA/g of pork and the DHA injected loins contained approximately1.46 mg DHA/g. This also changed the fatty acid profile of omega-6: omega-3 from, 5 to 1 in the CON pork, to a ratio of 1.7 to 1 in DHA pork. The appearance, odor, oxidation rates and sensory taste, as judged by a trained panel,determined the DHA injected meat to be, ‘slightly desirable' and gave lower ‘off flavour' scores, relative to the CON and SF injected pork. Pork can be fortified with DHA oil to 146 mg/100 g serving, which would meet half the recommended daily omega 3 fatty acid requirements for adult humans and would be desirable in taste.  相似文献   

灌溉定额和施氮量对机采棉田水分运移及硝态氮残留的影响     

尔晨  林涛  夏文  张昊  徐高羽  汤秋香 《作物学报》2022,(2):497-510

水资源短缺和土壤环境污染严重是制约农业可持续健康发展的瓶颈,迫使农民开发和采用可持续的农业生产技术。水分运动机理和氮肥残留行为是评价干旱地区农业水肥管理水平的依据,提高水氮利用效率是降低环境污染这一重要科学问题的重要途径。本研究采用裂区试验设计,以灌溉量为主区,设2250(低灌溉量,W1)、3450(传统灌溉量,W2)和4650 m~3 hm–2 (高灌溉量, W3) 3个灌溉量;设0 (空白, N1)、300 (传统施肥量, N2)和600 kg hm–2 (高施氮量, N3) 3个纯氮投入量,在干旱的中国西北内陆棉区开展2年的田间试验,评估灌溉和施氮策略对水氮运移、籽棉产量、水氮生产效率的影响。结果表明,灌溉量及水氮耦合效应是影响籽棉产量及灌溉水生产力的影响因素,其中灌溉量是主效应。2年均值表明,灌溉量为W1时,施肥量由N1增加至N3,生育期0～80 cm平均土壤含水量呈先显著上升后显著下降的趋势, N2和N3处理较N1处理籽棉产量分别提高13.8%和7.6%,水分利用效率分别提高13.6%和6.8%;灌溉量为W2和W3时,施肥量由N1增加至N3,生育期0～80 cm土层平均含水量...  相似文献   

Paleodemography of the libben site, Ottawa county, ohio     

Lovejoy CO  Meindl RS  Pryzbeck TR  Barton TS  Heiple KG  Kotting D 《Science (New York, N.Y.)》1977,198(4314):291-293

The Libben site, a Late Woodland ossuary and occupation site from the Great Black Swamp of northern Ohio has yielded a well-preserved skeletal sample of 1327 articulated individuals. The outstanding preservation and completeness of the site and the utilization of an exhaustive aging methodology make this the largest and most comprehensively censused North American prehistoric cemetery. Survivorship data indicate a robust, successful population. Life expectancy at birth was 20 years. Among adults, male mortality was consistently higher than female, a condition possibly related to high interpersonal and intergroup aggression. Infant mortality was generally low, and a general hypothesis concerning the elevation of infant mortality and the simultaneous depression of adult mortality among aboriginal peoples after European contact is suggested.  相似文献