Creation of a predictive equation to estimate fat-free mass and the ratio of fat-free mass to skeletal size using morphometry in lean working farm dogs     

YM Leung  BAS Hodgson 《New Zealand veterinary journal》2018,66(5):248-256

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广东郁南51年生灰木莲生长研究     

张栋  林宗鑫  李晓泳  文珊娜  姜清彬 《广东林业科技》2020,36(2):89-93

研究以广东省郁南林场大东坑工区内 51 年生灰木莲 Manglietia conifera 为研究对象，对灰木莲树高、胸径、材积、树干通直度、侧枝生长习性等指标进行调查和分析。结果表明：51 年生灰木莲生长良好，胸径平均为 44.28 cm，最大为 79.60 cm，树高平均为 20.79 m，最高为 27.00 m，单株材积平均为 1.48 m3，最高为 3.65 m3。可见，灰木莲引种在广东郁南适应性强，能够生长良好，具有生长速度快，树干通直，自然整枝好等特点，是该地区可以推广种植和培育大径材的优良树种。  相似文献   

广西东门林场森林资源现状和可持续发展策略   总被引：1，自引：0，他引：1  

莫继有  吴永富  兰俊  黎怀玲  吴兵  邓海群 《桉树科技》2011,(1):53-56

根据广西东门林场2009年森林资源二类调查的结果,分析东门林场森林资源现状、特点及存在的问题,并提出东门林场森林资源可持续发展的策略。  相似文献   

规模化奶牛场经营管理研究     

郑国生  黄仕伟 《中国奶牛》2012,(18):19-22

进入21世纪以来,中国奶业步入了快速发展期,规模化奶牛场经营管理的科学研究已经成为每个奶牛场经营管理者的必修课程和首要任务。本文对规模化奶牛场经营管理效能的相关影响因子进行了系统的综述,分析了规模化奶牛场经营管理的国内外研究现状、取得的成果以及存在的不足,并对未来我国规模化奶牛场经营管理的研究方向进行了展望。  相似文献   

农机工业必须依靠科技创新走新型工业化道路   总被引：8，自引：1，他引：8  

陈志 《农业机械学报》2003,34(3):131-134

分析了农机工业在新形势下不能适应我国农业发展和全面建设小康社会要求的现状，指出走新型工业化道路势在必行；系统论述了农机工业走新型工业化道路必须依靠科技创新，提高农机企业的管理水平和农机产品的科技含量，提升市场综合竞争力，开发新型农机技术和产品，保持农机工业和现代农业的可持续发展，发展先进技术装备和劳动力资源相结合的组合技术等主要方向和任务；提出了建设农机科技创新体系、支持农机创新活动等政策性措施和建议。  相似文献   

建设现代农业加快推进农业机械化   总被引：21，自引：3，他引：21  

王智才 《农业机械学报》2004,35(3):154-158,163

建设现代农业是新时期农业发展的方向。现代农业是以现代农机装备为基础的农业。建设现代农业，促进传统农业向现代农业的转变，推进农业产业化与现代化，发展农村经济，提高农业竞争力，增加农民收入，需要加快推进农业机械化发展，这既是解决农业劳动生产率较低、经济效益不高的重要措施，也是缩小城乡差别、提高农业和农村整体水平的重要条件。本文介绍了我国农业机械化发展现状，分析了我国农业机械化面临的新形势和新任务，提出了现阶段农业机械化发展思路和推进农机化的主要措施。  相似文献   

Analysis of the uncertainty associated with the estimation of nitrogen losses from farming systems     

Sylvain Payraudeau  Hayo M.G. van der Werf  Françoise Vertès 《Agricultural Systems》2007

This work describes the analysis of the uncertainty linked to the annual direct and indirect losses of different nitrogenous compounds at the scale of a group of farms. The nitrogen (N) forms taken into account are: ammonia (NH₃), nitric oxide (NO), nitrous oxide (N₂O), dinitrogen (N₂) and nitrate (NO₃). The gaseous N emissions for the different components of the farms are estimated with a selection of adapted emission factors. The NO₃ losses at the farm scale are calculated as the difference between the surplus of the farm-gate N balance and the gaseous N emissions.  相似文献   

描述农村劳动力转移状况的分室模型   总被引：6，自引：0，他引：6  

金秀满  张德骏 《农业机械学报》1997,28(3):60-64

为了分析农业化发展速度与农村劳动力转移速度之间的关系，本文肖试性地把史密斯提出的生态系统分室模型用于描述第一，第二，第三产业劳动力数量相互转移物动态变化中，提出了劳动力结构分室模型，为探讨农业机械化客观发展规律提供了构模思路。  相似文献   

基于模糊分析的农用运输车双万向传动轴可靠性优化设计     

刘羽  崇凯 《拖拉机与农用运输车》2007,34(5):80-81

将模糊可靠性设计应用于农用运输车传动轴的优化设计,提出了农用车双万向传动轴的模糊可靠性优化设计方法,建立了在满足给定模糊可靠性要求设计条件下优化设计数学模型,并进行了实例计算。  相似文献   

Use of saline–sodic waters through phytoremediation of calcareous saline–sodic soils     

M. Qadir  A. Ghafoor  G. Murtaza 《Agricultural Water Management》2001,50(3):197-210

Use of poor-quality groundwater has become inevitable for irrigation to compensate rapidly increasing water demands in many arid and semiarid regions. Salinity and sodicity are the principal soil and water quality concerns in such areas. Many saline–sodic and sodic soils have saline or saline–sodic subsurface drainage waters. Amelioration of these soils needs a source of calcium (Ca²⁺) that can replace the excess exchangeable sodium (Na⁺). Most of these soils, however, contain calcite (CaCO₃) of extremely low solubility. The native calcite does not supply adequate levels of Ca²⁺ for soil amelioration as do other chemical amendments. Phytoremediation may help ameliorate such soils through cultivation of certain crops tolerant to ambient soil salinity and sodicity. This amelioration strategy works through plant root action to help dissolve CaCO₃ to supply adequate Ca²⁺ without the application of an amendment. During a 3-year field experiment conducted under irrigated conditions, we evaluated phytoremediation against soil application of gypsum and farm manure, and water treatment with sulphuric acid on a calcareous saline–sodic soil (pH_s=8.0–8.4, EC_e=24–32 dS m⁻¹, SAR=57–78, CaCO₃=45–50 g kg⁻¹ for the top 0.15 m depth; Calcic Haplosalids). A saline–sodic water (EC=2.9–3.4 dS m⁻¹, SAR=12.0–19.4, RSC=4.6–10.0 mmol_c l⁻¹, SAR_adj=15.6–18.4) was used to irrigate the rice (Oryza sativa L.) and wheat (Triticum aestivum L.) crops grown in rotation. Active desalinisation and desodication processes were observed in all the treatments. After the final wheat crop, the 1.2 m soil profile EC_e was 7±0.5 dS m⁻¹ and SAR was 15±2 with non-significant treatment differences, indicating comparable soil amelioration effect of phytoremediation with other treatments. Better crop yields were obtained from the manure-treated plots, owing to its annual addition to the soil that possibly improved soil fertility. Phytoremediation needed minimum capital input because no initial investment was made to purchase the amendments.  相似文献