多年生观赏草的生长和繁殖特性研究     

赵天荣  张秋君  蔡建岗  沈岚 《北方园艺》2011,(15):103-106

对引种的13种观赏草的物候期、生长情况、繁殖特性进行了调查研究并结合引种试验和应用调查对其引种安全性进行了评价.结果表明:13种观赏草均能够在宁波气候条件下正常生长,达到较好的景观效果,而且不存在自播和根系扩张的可能,确保了生态安全.为今后观赏草在长三角地区园林景观中的应用提供了依据.  相似文献   

屋顶绿化制约因素分析及营建对策   总被引：1，自引：0，他引：1  

刘静鹤 《林业调查规划》2008,33(5)

通过对屋顶绿化发展现状的介绍,从社会公众的认识观念、建筑屋顶构造状况及施工环境、使用材料到行业政策、技术规范、绿化形式、投资渠道等多方面分析了制约因素,并依此提出了有针对性地开展屋顶现状普查、制订行业法规和技术规范、加强领导、开展科研技术攻关及植物材料的选育和政府主导、财政和企事业单位及开发商等多元投资方式的营建对策.  相似文献   

CTM系列汽车拖拉机综合测试仪在汽车滑行阻力系数测定中的应用     

刘军玉 《农业装备与车辆工程》2007,(8):51-52

介绍了汽车滑行阻力系数的测定方法,理论分析和试验结果均表明:应用CTM系列汽车拖拉机综合测试仪,在测定汽车滑行距离的同时,测定汽车滑行阻力系数的方法简便、可靠。  相似文献   

激抗菌肥1号在水稻上的应用效果试验     

蔺洪海 《辽宁农业职业技术学院学报》2004,6(2):26-27

用有机生物菌肥“激抗菌肥1号”浸水稻种子，水稻秧苗素质好，分蘖早，分蘖成穗多，穗大、粒多、粒重，增产49．5kg／667m^2，增加产值94．5元／667m^2。  相似文献   

机插稻大田耕整质量与稻草还田技术研究   总被引：1，自引：0，他引：1  

叶厚专  药林桃  周韧金  曹晓林  何小金  廖禺  万鹏 《江西农业学报》2009,21(7):35-37

大田试验结果表明:在确保规范化、标准化育秧的前提下,机插早稻大田田面平整度应小于3.0 cm,才能较好地保证机插质量;二晚机插大田稻草还田量应控制在80%以内,并结合施入适量氮素,加速稻草分解。  相似文献   

Bulked Segregant Analysis to Detect QTL Related to Heat Tolerance in Rice （Oryza sativa L.） Using SSR Markers   总被引：3，自引：0，他引：3  

ZHANG Gui-lian  CHEN Li-yun  XIAO Guo-ying  XIAO Ying-hui  CHEN Xin-bo  ZHANG Shun-tang 《中国农业科学(英文版)》2009,8(4):482-487

The study was undertaken to assess the genetic effect of quantitative trait loci （QTLs） conferring heat tolerance at flowering stage in rice. A population consisting of 279 F2 individuals from the cross between 996, a heat tolerant cultivar and 4628, a heat-sensitive cultivar, was analyzed for their segregation pattern of the difference of seed set rate under optimal temperature condition and high temperature condition. The difference of seed set rate under optimal temperature condition and high temperature condition showed normal distribution, indicating the polygenic control over the trait. To identify main effect of QTL for heat tolerance, the parents were surveyed with 200 primer pairs of simple sequence repeats （SSR）. The parental survey revealed 30% polymorphism between parents. In order to detect the main QTL association with heat tolerance, a strategy of combining the DNA pooling from selected segregants and genotyping was adopted. The association of putative markers identified based on DNA pooling from selected segregants was established by single marker analysis （SMA）. The results of SMA revealed that SSR markers, RM3735 on chromosome 4 and RM3586 on chromosome 3 showed significant association with heat tolerance respectively, accounted for 17 and 3% of the total variation respectively. The heat tolerance during flowering stage in rice was controlled by multiple gene. The SSR markers, RM3735 on chromosome 4 and RM3586 on chromosome 3 showed significant association with heat tolerance respectively, accounted for 17 and 3% of the total variation respectively. The two genetic loci, especially for RM3735 on chromosome 4, can be used in marker-assistant-selected method in heat tolerance breeding in rice.  相似文献   

Effects of Clear‐Cutting Alder Coppice on Surface Soil Properties and Aboveground Herbaceous Plant Biomass     

《Communications in Soil Science and Plant Analysis》2012,43(15-16):2562-2578

The purpose of this investigation was to evaluate the effects of clear‐cutting and skidding impacts on surface soils in an alder coppice and aboveground herbaceous biomass. For this purpose, experimental sites used in the study were a randomized complete block with four replications. Some soil properties were measured at 60 pits at 0 to 5 cm and 5 to 10 cm deep in control, normal harvest, and main skid trail sites. In the main skid trail site, as compared to the control and normal harvest site, the bulk density increased from 0.90 to 1.52g cm^?3, the soil organic‐matter content decreased from 4.77% to 1.65%, and saturated hydraulic conductivity decreased from 86.34 to 9.6 cm h^?1 at 0 to 5 cm deep. Optimization of harvesting time and rehabilitation of skid roads needed to be done to prevent and minimize negative impacts of the skid roads on soils.  相似文献   

EFFECT OF WATER MANAGEMENT AND POLYOLEFIN-COATED UREA ON GROWTH AND NITROGEN UPTAKE OF INDICA RICE     

《Journal of plant nutrition》2013,36(10):2173-2190

ABSTRACT

Poor water management and high nitrogen (N) losses are the key problems faced by rice farmers under rainfed inland valley systems. There is a need to evaluate different N fertilizers so as to identify one that could withstand these problems. The performance of polyolefin-coated urea (POCU) was therefore compared with conventional urea in a pot experiment with indica rice (Oryza sativa L. cv. IR36), using two water management systems: 1) Submerged condition referred to as good water management (GWM), and 2) excessive irrigation (over 4000 mm in 120 days) referred to as poor water management (PWM). The study was carried out during 1997 and 1998 cropping seasons under glasshouse conditions. For PWM in 1997, the pots were subjected to leaching only whereas in 1998, they were subjected to both surface runoff and leaching. For both cropping seasons, POCU-treated plants under PWM had a significantly higher grain yield (377.5 and 343.0 g m^?2) than urea-treated plants (316.5 and 260.5 g m^?2). In addition, POCU-treated plants had a significantly higher number of grains per panicle than urea-treated plants. In 1998, both the partial factor productivity of applied N and the agronomic nitrogen-use efficiency of POCU-treated plants under GWM and PWM were significantly higher than those of urea-treated plants. It can be inferred that (using sandy soils and under PWM), POCU could perform significantly better than conventional urea. This finding is important, considering the usually high nitrogen losses in rice-growing inland valley swamps.  相似文献   

我国牛群中牛病毒性腹泻病毒流行的Meta分析          下载免费PDF全文

朱杰  杨才俊  祁明普  杨凯辉  王宇  陈颖钰  陈曦  胡长敏  郭爱珍 《华中农业大学学报》2023,42(2):48-62

为全面评估我国牛群中牛病毒性腹泻病毒（bovine viral diarrhea virus,BVDV）病原流行率对该病毒感染的防控，在中国知网（CNKI）、万方、维普、PubMed和ScienceDirect 5个数据库中，检索截止到2021年9月1日发表的关于中国牛群BVDV流行情况的文献，并进行系统评价和Meta分析。共筛选出93篇关于BVDV病原学检测的研究论文纳入Meta分析中。分析结果显示：我国牛群中BVDV病原（抗原和核酸）流行率为9.8%(95%CI:7.8,11.9)，其中BVDV抗原流行率为3.1%(95%CI:2.1,4.4),BVDV核酸流行率为19.5%(95%CI:16.0,23.3)。各省间比较发现，吉林流行率最高，为26.3%(95%CI:24.3,28.4)，其次是湖北和福建省。进一步开展亚组分析和Meta回归分析的结果显示，品种（牦牛vs奶牛：比值比（odds ratio,OR）=1.37,95%CI:1.05～1.79）、饲养模式（散养vs规模化：OR=1.41,95%CI:1.08～1.85）、诊断方法（RT-PCR vs ELISA:OR=1....  相似文献   

春小麦新品种 JZ5 引种赞比亚试验     

王晓波  包和平 《广东农业科学》2020,47(10):1-10

【目的】吉林农业大学承担了国家商务部中国援赞比亚农业技术示范中心项目，为落实“人员培训、科学研究、示范推广、宣传展示”任务，尊重受援国意愿，坚持“受援国提出、受援国同意、受援国主导”，根据当地对小麦品种的需求，进行了小麦品种选育工作。【方法】JZ5品种以C7906作母本、NS2作父本有性杂交通过系谱法选育而成，是国内优良的春小麦品种，于 2011年引种到赞比亚。【结果】经过多年引种试验、区域试验和生产试验，JZ5在所有参试小麦中表现为平均穗粒数65粒、千粒干质量54.2 g，产量潜力 11 000 kg/hm2。小麦种植期间正值赞比亚旱季，干热风对小麦灌浆影响较大，而JZ5灌浆速率快、结实率高，几乎不受干热风影响，耐干热风能力强，抗蚜虫，高抗白粉病，具有明显高产稳产特性。于2016年3月7日通过赞比亚农业部种子认证和控制研究所（SCCI）审定。【结论】JZ5适宜在赞比亚3个生态区种植，允许在赞比亚进行商业化推广，丰富了赞比亚的种质资源。  相似文献