牧草新品种黔草1号高羊茅的选育   总被引：2，自引：0，他引：2  

吴佳海  牟琼  唐成斌  尚以顺  莫本田  瓦庆荣 《贵州农业科学》2006,34(4):75-79

黔草1号高羊茅是利用贵州地方野生资源作亲本,采用改良混合选择法,经10余年的选育研究育成的新品种。该品种抗逆性强、适应性广、坪用性好、耐践踏、持续性好、绿期长,返青期比引进品种凌志提前7 d,枯黄期晚3 d;种子成熟期集中,种子平均产量比对照品种高20%以上。适应我国长江中下游低山、丘陵等地区种植,是运动场草坪、环境绿化、生态治理的优良草种。  相似文献   

Influence of Cultural Practices on the Performance of Long Level Basins in Egypt     

Z. El-Haddad  A.J. Clemmens  M. El-Ansary  M. Awad 《Irrigation and Drainage Systems》2001,15(4):327-353

Several field studies were conducted tobetter understand the influence of culturalpractices, inflow rate and field conditionson the performance of modern surfaceirrigation systems in Egypt. Field datawere collected on wheat and cotton underEgyptian conditions in order to estimateinfiltration, roughness and performanceparameters. Tests were made with a varietyof inflow rates and a variety ofcross-section shapes (flat or furrowed andseveral furrow spacings). These studiesprovide information on expected values ofinfiltration and roughness parameterstypical of cracking clay soils in the NileDelta, as well as guidelines andrecommendations for use of long-levelbasins in Egypt.  相似文献   

用于狂犬病常规诊断的一种组织培养感染试验     

Webs.  WA 《中国兽药杂志》1989,(2):45-48

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Effect of Qidan on the expression of transforming growth factor-β1 an d tumor necrosis factor-α in a rat model of bleomycin-induced pulmonary fibros is     

JIN Chang-jun  XIN Hong-tao  LIN Dian-jie  MU Xiao-yan  XV Shao-hua  WA NG Zhen 《园艺学报》2006,22(4):814-817

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The Current State of Solar Modeling     

J Christensen-Dalsgaard  W Dappen  SV Ajukov  ER Anderson  HM Antia  S Basu  VA Baturin  G Berthomieu  B Chaboyer  SM Chitre  AN Cox  P Demarque  J Donatowicz  WA Dziembowski  M Gabriel  DO Gough  DB Guenther  JA Guzik  JW Harvey  F Hill  G Houdek  CA Iglesias  AG Kosovichev  JW Leibacher  P Morel  CR Proffitt  J Provost  J Reiter  EJ Rhodes  FJ Rogers  IW Roxburgh  MJ Thompson  RK Ulrich 《Science (New York, N.Y.)》1996,272(5266):1286-1292

Data from the Global Oscillation Network Group (GONG) project and other helioseismic experiments provide a test for models of stellar interiors and for the thermodynamic and radiative properties, on which the models depend, of matter under the extreme conditions found in the sun. Current models are in agreement with the helioseismic inferences, which suggests, for example, that the disagreement between the predicted and observed fluxes of neutrinos from the sun is not caused by errors in the models. However, the GONG data reveal subtle errors in the models, such as an excess in sound speed just beneath the convection zone. These discrepancies indicate effects that have so far not been correctly accounted for; for example, it is plausible that the sound-speed differences reflect weak mixing in stellar interiors, of potential importance to the overall evolution of stars and ultimately to estimates of the age of the galaxy based on stellar evolution calculations.  相似文献   

高寒草甸草地水、土、草中氮硫含量冷暖季节的变化   总被引：3，自引：0，他引：3  

罗海玲  黄有德  张尤嘉  张英俊  颜生林  肖西山  李成魁  王玲英  王芳霞 《草业科学》2001,18(4):39-42,45

根据青海高原特殊的气候分布特征，把高寒草甸草地绵羊放牧地划分为冷季和暖季。通过测定冷暖绵羊放牧地水、土壤、牧草中氮和硫含量的结果表明：水、土壤、牧草中氮和硫的含量暖季＞冷季（P＜0．05），其中地表水冷季含硫量分别为3．7mg/kg、5.1mg/kg，水中没有检测到氮；牧草中硫含量冷暖季分别为2952mg/kg,3262mg/kg，差异显著（P＜0．05）；牧草中氮含量冷暖季分别为0．62％、1．36％，差异显著（P＜0．05）；土壤氮含量冷暖季分别为0．22％、0．285％，差异显著（P＜0．05）；硫含量冷暖季分别为0．24％、0．37％。  相似文献   

刈牧后休闲期对草地牧草生产的影响   总被引：2，自引：2，他引：0  

瓦庆荣  代志进  卢琪 《草业科学》2000,17(3):33-34,38

通过不同间隔时期对多年生黑麦草、白三叶混播草地牧草产量的监测与分析,得出随着休闲期的增加,青绿物质和死亡物质均呈现上升趋势,在较低和较高草地牧草现存量下都会降低牧草生长率。  相似文献   

贵州足球场草坪建植及化管理模型研究   总被引：1，自引：0，他引：1  

吴佳海  尚以顺  陈瑞霞  蒋明凤  瓦庆荣  刘贵林  田素珍 《草业科学》2000,17(5):73-77

在一定的生境和管理条件下,以修剪高度、修剪次数和施N、P、K量为因素,利用二次正交回归设计,用模糊综合评分法评定草坪质量,最佳3因子水平为:修剪高度5～7.4cm,修剪次数4～6次/月,施N量为2.5～3.7g/(m2·年),施P、K量各为L25～1.85g/(m2·年),建立了草坪质量与养护3因子间的显著相关回归模型.  相似文献   

Relative Contributions of Uranium, Thorium, and Potassium to Heat Production in the Earth   总被引：1，自引：0，他引：1  

GJ Wasserburg  GJ Macdonald  F Hoyle  WA Fowler 《Science (New York, N.Y.)》1964,143(3605):465-467

Data from a wide variety of igneous rock types show that the ratio of potassium to uranium is approximately 1 X 10(4). This suggests that the value of K/U approximately 1 X 10(4) is characteristic of terrestrial materials and is distinct from the value of 8 X 10(4) found in chondrites. In a model earth with K/U approximately 10(4), uranium and thorium are the dominant sources of radioactive heat at the present time. This will permit the average terrestrial concentrations of uranium and thorium to be 2 to 4.7 times higher than that observed in chondrites. The resulting models of the terrestrial heat production will be considerably different from those for chondritic heat production because of the longer half-life of U(238) and Th(238) compared with K(40).  相似文献   

Incidence of presenting complaints and diagnoses in insured Australian dogs     

S Wolf  J Selinger  MP Ward  P Santos-Smith  M Awad  A Fawcett 《Australian veterinary journal》2020,98(7):326-332

Knowledge of the most common presenting complaints and diagnoses in companion animals is valuable in preparing veterinary students and veterinarians to manage the most frequently observed conditions in clinical practice. Pet insurance databases provide access to large sample populations and have been previously used to describe disease incidence in companion animals. The aim of this study was to determine the incidence of presenting complaints and diagnoses in insured Australian dogs through the use of a pet insurance database. Analysis of a de-identified dataset containing pet insurance claims associated with presenting complaints and diagnoses from 488,472 insured Australian dogs insured in the years 2016 and 2017, was performed. Annual incidence rates of presenting complaints and diagnoses were calculated and expressed as, number of events per 1,000 dog years at risk. The presenting complaints with the highest incidence were vomiting (14.21 events per 1,000 dog years at risk in 2016, 15.80 events per 1,000 dog years at risk in 2017) and pruritus (8.79 events per 1,000 dog years at risk in 2016, 10.30 events per 1,000 dog years at risk in 2017). Presenting complaints affecting the gastrointestinal system were the most common (19.20 events per 1,000 dog years at risk in 2016, 20.77 events per 1,000 dog years at risk in 2017). The diagnoses with the highest incidence were otitis externa (34.12 events per 1,000 dog years at risk in 2016, 34.82 events per 1,000 dog years at risk in 2017) and dermatitis (28.05 events per 1,000 dog years at risk in 2016, 29.99 events per 1,000 dog years at risk in 2017). Diagnoses affecting the integument were the most common (216.56 events per 1,000 dog years at risk in 2016, 219.06 events per 1,000 dog years at risk in 2017). The results from this study can aid in the design of relevant veterinary curricula and may be helpful in prioritising research on common clinical conditions.  相似文献