温室一茄多果快速育成技术     

赵鹏 《蔬菜》2017,(11):40-43

随着嫁接技术在蔬菜育苗中的广泛应用,根据近年来兴起的一茄多果嫁接技术与园艺景观造型相结合的趋势,介绍了一种改进的一茄多果嫁接技术,技术的流程更简洁,也更易于操作,可使经济效益与人文景观效果得到共同提升。  相似文献   

基于SWOT-AHP分析的内蒙古农牧业可持续发展研究     

李语涵 《现代农业科技》2023,(20)

摘要：通过运用SWOT分析法，从多个维度确定影响内蒙古农牧业发展的因素，再运用AHP分析法，将SWOT分析的影响因素作为指标层，邀请专家打分构造判断矩阵，将其量化的指标按其重要性进行排序。通过计算总优势、劣势、机遇、威胁力度，绘制战略四边形，并且计算战略四边形重心，判断战略定位，最后进行战略选择。结果显示内蒙古农牧业可持续发展中机遇>优势>劣势>威胁。战略中心位于第一象限内，说明应该采取开拓性战略，战略方位角=49.14°，说明目前处于机遇期。因此内蒙古农牧业应该制定积极的发展战略，依靠内部优势，充分利用外部机会。  相似文献   

Mapping soil salinity and pH across an estuarine and alluvial plain using electromagnetic and digital elevation model data     

J. Huang  V. N. L. Wong  J. Triantafilis 《Soil Use and Management》2014,30(3):394-402

Increasing pressures from agriculture and urbanization have resulted in drainage of many floodplains along the eastern Australian coastline, which are underlain by sulphidic sediments, to lower water tables and reduce soil salinity. This leads to oxidation of the sediments with a rapid decline in pH and an increase in salinity. Accurately mapping soil salinity and pH in coastal acid sulphate soil (CASS) landscapes is therefore important. One required map is the extent of highly acidic (i.e. pH < 4.5) areas, so that the application of alkaline amendments (e.g. lime) to neutralize the acid produced can be specifically targeted to the variation in pH. One approach is to use digital soil mapping (DSM) using ancillary information, such as an EM38, digital elevation models (DEM – elevation) and trend surface parameters (east and north). We used an EM38 in the horizontal (EM38h) and vertical (EM38v) modes together with elevation data to develop multiple linear regressions (MLR) for predicting EC_1:5 and pH. For pH, best results were achieved when the EM38 EC_a data were log‐transformed. By comparing MLR models using REML analysis, we found that using all ancillary data was optimal for mapping EC_1:5, whereas the best predictors for pH were north, log‐EM38v and elevation. Using residual maximum likelihood (REML), the final EC_1:5 and pH maps produced were consistent with previously defined soil landscape units, particularly CASS. The DSM approach used is amenable for mapping saline soils and identifying areas requiring the application of lime to manage acidic soil conditions in CASS landscape.  相似文献   

陕西安康烟区生育期气候综合指数对烤烟化学成分的影响     

赵鹏 《湖南农业大学学报(自然科学版)》2013,39(5):458-462

为了明确烤烟不同生育期气候资源对烟叶品质的贡献率，以陕西安康烟区2002—2011年气象资料和烟叶化学成分为材料，采用主成分分析法，对烤烟不同生育期的平均温度、降水量和日照时数进行分析，构建不同生育期的气候综合指数(CCI)；采用相关分析、通径分析和决策分析对各生育期CCI与烟叶化学成分的关系进行分析。结果表明：不同生育期CCI对烟碱含量的影响以采烤前期最大，旺长期最小，对采烤前期的影响主要为直接作用；对烟叶总糖含量的影响以采烤后期最大，采烤前期最小，对采烤后期的影响主要为直接作用和通过旺长期的间接作用；对烟叶糖碱比的影响以采烤后期最大，旺长期最小，采烤后期的影响主要为直接作用和通过采烤前期的间接作用。  相似文献   

基于WSN的油菜生长环境数据采集系统     

李建辉  廖桂平  王访 《湖南农业大学学报(自然科学版)》2013,39(6):675-682

针对传统作物生长环境数据获取手段实时性差、劳动强度大以及部署微型自动气象站和商用Zigbee产品成本高、开放性较差等问题，设计并实现了一种基于WSN的油菜生长环境数据采集系统。提出了轻量级的能量感知路由协议CLFP，并给出了软硬件的相关设计方法。仿真和大田试验结果表明，系统温度采集精度最高可达0.01 ℃，测湿精度达±5%，光强采集范围为1~65 535 lx，可并发的数据传输达到36路，可满足农业现场环境数据的较高测量要求。在标称电源供电情况下，系统实际有效生存周期超过142 d，由于采用AT89C51和nRF2401作为基础硬件平台，成本低廉，有助于大规模部署和应用。  相似文献   

生产力促进中心咨询诊断服务的SWOT分析     

薛强  赵静 《湖南农业大学学报(自然科学版)》2013,(4):69-74

生产力促进中心自建设发展以来，形成了多样化的服务业务。其中，咨询诊断服务不断衍化发展，已经成为服务中小企业的重要手段，积累了一定的优势，也存在着劣势。面对科技服务业迅猛发展的态势，生产力促进中心开展咨询诊断服务面临机遇与挑战并存的局面，通过基于SWOT分析法构建的评价模型，明确主要影响因素，进而推演出下一步发展的具体路径。  相似文献   

提升犊牛日增重的方法研究     

吴赫云  解玲娜  郑玺 《中国乳业》2021,(8):52-55

犊牛阶段的生长状况对牛只的生产性能具有重要影响,为提高牧场效益,牧场越来越追求犊牛阶段生长的最大化。通过饲喂代乳粉达到犊牛断奶前1.0 kg日增重,对牛只生产性能的提升具有重要意义。本文主要介绍增加犊牛日增重对牛只生产性能的积极影响,同时根据荷兰Schils的试验对代乳粉的选择和饲喂流程提出建议,以期对牧场合理使用代乳粉,实现犊牛阶段生长最大化提供参考。  相似文献   

Soil aggregate formation and stability induced by starch and cellulose     

《Soil biology & biochemistry》2015

Soil aggregate (SA) can be formed and stabilized when soil organic matter (SOM) is decomposed in the soil. However, the relationships between the SA dynamics and SOM with different decomposition rates have not been clarified. Therefore, this study examined the effects of the addition of polysaccharides to soil on SA formation and stability. A Japanese tropical soil was incubated for 99 d at 30 °C in a dark environment following the addition of 0.5% (w/w) starch or cellulose. The decomposition rates of the amendments, and SA formation and stability were evaluated by measuring soil respiration rates, and distribution fractions of soil aggregate sizes and mean weight diameter (MWD) of SA, respectively. The cumulative soil respirations with all treatments rapidly increased until Day 12 of the incubation. The initial slope of the cumulative soil respiration in the soil with starch was significantly higher than that in the soil with cellulose. In either soil with starch or cellulose, the fractions of macro-aggregates (>1000 μm in diameter) significantly increased, respectively, compared with control soil. However, the fractions of meso-aggregates (250–1000 μm) and nano-aggregate (<20 μm) in the soil with starch significantly decreased, while those fractions in the soil with cellulose fluctuated until Day 6. The MWDs reached the maximum on Day 6, indicating the SA formation in the soils with starch or cellulose. The increasing rate of the SA formation in the starch-amended soil was greatly higher than that in the cellulose-amended soil. After Day 6, the MWDs in the soils with either polysaccharide decreased with similar trends with no significant differences between treatments, indicating similar stability of the SA in both treatments. This study showed that the different decomposability of the organic amendments might influence the SA formation differently, but not the SA stability.  相似文献   

Environmental heat and airborne pollen concentration are associated with increased asthma severity in horses          下载免费PDF全文

M. Bullone  R. Y. Murcia  J‐P. Lavoie 《Equine veterinary journal》2016,48(4):479-484

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Evaluation of the neutrophil-to-lymphocyte and platelet-to-lymphocyte ratios in critically ill dogs     

Lisa H. Dourmashkin BS  Bridget Lyons VMD  DAVCECC  Rebecka S. Hess DVM  DACVIM  Koranda Walsh VMD  DACVIM  DACVP  Deborah C. Silverstein DVM  DAVCECC 《Journal of Veterinary Emergency and Critical Care》2023,33(1):52-58

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