共查询到20条相似文献，搜索用时 140 毫秒
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<正>近年来,山丹县种子管理局以科学发展观为指导,切实加强了自身建设,强化了单位内部管理,加快了新品种的引进、试验示范和推广步伐,建立了标准化种子基地,加强了种子市场管理,加大了项目建设力度,有效地推动了种子产业化的发展,为农业增效、农民增收发挥了积极的作用。 相似文献
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浅析庭院果树园艺的价值及栽培技术特点 总被引：1，自引：0，他引：1
在经济发展不断增速的背景下,人们对生活水平有了更高的要求。我国作为农业大国,近年来果品产量有了明显的提高,庭院果园成为了主要的发展趋势,不仅实现了种植者经济效益的提升,而且改善了人们的家居环境。针对庭院果树园艺的价值进行了分析,并研究了栽培技术的特点,从而为庭院果树园艺的推广创造有利条件。 相似文献
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干旱条件下锌、锰肥对玉米叶绿素含量的影响 总被引：7，自引：0，他引：7
研究了盆栽条件下施用微量元素锌和锰对玉米生长及叶片叶绿素含量的影响。在正常供水和土壤干旱条件下,施用锌、锰肥明显改善了玉米的生长状况和叶片叶绿素含量。干旱情况下,施锌处理的玉米株高增加了11.7%,地上部和地下部干物质增加了37.8%和69.3%,施锰处理的玉米株高增加了12.6%,地上部和地下部干物质增加了24.8%,和29.5%。正常供水条件下,施锌处理的玉米株高、地上部及地下部干物质分别依次增加了10.7%、11.1%和30.3%;施锰处理的玉米分别依次增加了9.0%、7.6%和21.6%。正常供水条件下,施锌使玉米叶片叶绿素a增加了14.3%、叶绿素b增加了15.3%、总叶绿素含量增加了14.8%;施锰使叶绿素a增加了31.7%、叶绿素b增加了40.0%、总叶绿素含量增加了35.8%。干旱情况下,施锌使叶绿素a增加了8.9%、叶绿素b增加了10.23%、总叶绿素含量增加了9.5%。施锰处理的叶绿素a增加了16.3%、叶绿素b增加了11.7%、总叶绿素含量增加了12.6%。 相似文献
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不要以为挂了热带水果的头衔,在北方种植就是一种奢望。别忘了它还有另外一个身份——多肉植物。您种了之后就会发现,火龙果没那么难伺候。2008年,我办起了个火龙果种植园,是提着脑袋干的,没想到还真成功了。摸索了几年,从原来的门外汉,摇身一变成了行内人士。2011年1月,我开始尝试盆栽火龙果。2012年5月,它们都开花挂果了。 相似文献
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我国棉种产业化现状与前景展望 总被引：9，自引：0，他引：9
回顾了我国棉种产业的发展阶段,分析了棉种产业化实施的历史背景,从总体上和产业体系的五个方面分别归纳总结了我国棉种产业化取得的巨大成就,指出了我国棉种产业化存在的问题,提出了加快棉种产业化的政策建议,展望了我国棉种产业化的发展前景. 相似文献
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<正>近日,杜邦公布了第三季度及2011年前九个月的财务业绩。第三季度受销量上涨26%的推动,杜邦农业版块的销售额达到了13.68亿美元,较第二季度增长了41.5%。前九个月农业版块销售额上涨了26%,达到了78.69亿美元。 相似文献
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介绍了膜分离技术在乳品工业中的应用范围,同时从理论上阐述了膜分离技术微滤、超滤、纳滤与反渗透在乳品除菌、乳蛋白质的分离浓缩、分离脂肪、乳清脱盐、牛奶浓缩、乳品标准化,以及乳品生产企业废水回收等方面的应用。 相似文献
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氮肥类型与施用量对夏玉米生长发育及氮肥利用的影响 总被引：20，自引：0，他引：20
以减少氮肥损失、提高夏玉米氮肥利用率为着眼点,对3种类型氮肥(普通尿素、包膜尿素、复合肥)不同施用量对夏播玉米品种郑单958与农大108的生长发育及氮肥利用的影响进行了研究。结果表明,在本试验施氮范围内(折合N 0~180 kg/hm2),两品种随施氮量增加而显著增产;同一施氮水平下以复合肥增产效应最好,但3种类型氮肥之间的产量差异不显著。两品种穗粒数随施氮量增加而增加,与氮肥类型关系不大,而千粒重受氮肥类型影响较大,且品种间表现有差异。LAI、干物重与叶片叶绿素含量均随施氮量增大而增大,且复合肥和包膜尿素对以上3个性状值的提高较普通尿素更明显。与普通尿素相比,包膜尿素与复合肥的氮肥利用率较高,但不能相应地提高氮收获指数。各类型氮肥的利用率均具有基因型差异。 相似文献
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量化分析作物生产碳、氮足迹可以有效帮助减少农业温室气体和活性氮排放。基于足迹理论和方法，采用问卷调查方式定量研究长江流域水稻生产碳足迹和氮足迹大小及组成。研究表明，水稻单位产量碳足迹和氮足迹分别介于0.50～0.90kgCO2-eq/kg和5.20～13.17gN-eq/kg，其中CH4和NH3排放为主要贡献因子。种植规模与碳足迹和氮足迹呈现显著负相关关系，与一般农户(低于0.7hm2)水稻种植相比，种粮大户(高于3.3hm2)碳足迹和氮足迹分别降低了33.8%和44.1%。在调研的稻田中发现，53.1%的地块肥料投入过量，54.9%的地块灌溉投入过量，且产量较低，存在着较大的节能减排潜力。提高农户的受教育水平和低碳绿色农业认知能够显著降低水稻生产碳、氮足迹。因此，发展双季稻节肥节水技术，提高农业机械运行效率，构建规模化农作种植模式，同时提升农户知识文化水平和加强低碳绿色农业知识的普及力度以及不同类型适应性行为的指导，健全低碳绿色农业技术创新与推广机制，有利于缓解中国长江流域双... 相似文献
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采用HPLC法检测分析了黄麻链霉菌NF0919菌株发酵提取液的主要有效成分,以确定该发酵液的HPLC检测方法,采用菌丝生长速率法对不同处理条件下的发酵提取液进行抑菌活性测定,以确定该发酵提取液的稳定性。结果表明,在采用C18柱,波长305nm,甲醇与水梯度洗脱的条件下,所检测到的发酵提取液物质成分最多;该菌株发酵提取液对热、碱、紫外线的稳定性较差,对酸、光照均较稳定,在冰箱贮藏条件下,该菌株的发酵提取液稳定性较强,具有一定的研究开发价值。 相似文献
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基于生命周期法的中国2004—2015年油菜生产氮足迹分析 总被引：1，自引：0，他引：1
The loss of reactive nitrogen in agriculture has increasingly become serious, systematic analysis of reactive nitrogen emissions from agricultural production is conducive to promoting the green and healthy development of agriculture in China. Based on the statistical data of crop yield and farmland investment in the oilseed rape production of China, the spatiotemporal dynamic change of nitrogen footprint (NF) and its composition of oilseed rape during 2004-2015 in China was estimated using the theory of NF and life cycle assessment method in the agricultural sector. The NF of oilseed rape was 7572.0 g N-eq ha -1 during 2004-2015, and decreasing year by year, with an average annual decline of 1.0%. The main components of the NF were from fertilizer application (20%) and NH3 emission (54%) in the oilseed rape production. Obvious differences also were observed among mainly agricultural provinces in China, that is, the higher nitrogen footprint per area (NFa) and nitrogen footprint per yield (NFy) in Inner Mongolia, Shanghai, and Jiangsu region. The NFa and NFy in high yield region were significantly higher than those in low yield region. Among them, the NF of nitrogenous fertilizer, phosphate fertilizer and compound fertilizer increased by 80.6%, 76.9%, and 57.8%, respectively (P < 0.05). The NFa of rapeseed in China showed a trend of increase with the increase of rapeseed yield, but there was no significant correlation. The results suggest that improving crop management practices that limit fertilizer consumption is an important measure for the green and healthy development of rapeseed in China. 相似文献
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Non‐flooded rice cultivation has been proven to be an effective measure to reduce water consumption in drought areas of Southeast China. However, rice cultivation under non‐flooded conditions leads to less stable productivity and lower grain yield. The objectives of this study were (1) to compare crop performance and yields among flooded and non‐flooded rice over several seasons, (2) to identify the yield performed in non‐flooded rice systems over seasons and whether the options which included no‐tillage, straw mulching and wet‐dry rotation system can narrow the grain yield gap between non‐flooded and traditional flooded condition. The results showed the difference between flooded rice (F) and non‐flooded rice (NF) with straw mulching was much lower than the difference between F and NF without straw mulching. Within late seasons, the difference of aboveground total biomass between non‐flooded rice without mulching and flooded rice gradually widened as the number of cropping seasons increased. Compared with the non‐flooded rice without mulching, straw mulching can reduce the decline of aboveground total biomass and grain yield. The yield difference between F and NF treatments became smaller in no‐tillage plots than complete tillage plots. It suggested that no‐tillage can keep the crop production more stable. In comparison with continuously non‐flooded cultivation, our study indicated that the wet‐dry rotation system can reduce the yield decline under non‐flooded condition. 相似文献
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本研究旨在揭示山核桃水溶性成分的神经营养活性及活性因子。利用脱脂山核桃水溶性提取物处理SH-SY5Y细胞,用倒置相差显微镜观察细胞突触生长,用qPCR检测相关基因表达,使用HPLC
及LC-MS对山核桃水溶性成分神经营养活性因子进行分离鉴定。结果显示,山核桃的水溶性成分能够显著促进SH-SY5Y细胞的突触生长,并可以显著上调SH-SY5Y细胞NF160 基因的表达。HPLC及LCMS检测结果发现其水溶性成分主要组成为胞苷、尿苷、鸟苷、腺嘌呤、腺苷等。由此可知,山核桃水溶性成分通过上调NF160基因表达具有神经营养活性。 相似文献
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The effects of nitrogen (N) fertilization of a rye pasture (Secale cereale L.) on the chemical composition of forage and its utilization in vivo and in situ were investigated in winter (W) and early spring (S). Half of the paddock to be assayed was spread with 93 kg urea–N ha?1 (treatment F), and the other half was not fertilized (treatment NF). Each experiment lasted for 17 days; apparent dry matter digestibility in vivo, voluntary dry matter intake (DMI) and digestible DMI were measured on nine rams per treatment. Two rumen cannulated animals per treatment were under the same feeding regime, and used to collect samples of rumen contents. The concentrations of ammonia (NH3) and short‐chain fatty acids and pH were measured in these samples. The offered forage was also incubated in the rumen of three Holstein–Friesian steers to estimate its degradation parameters in situ. Fertilization with N increased total N and decreased dry matter (DM) and non‐structural carbohydrate concentrations in both periods. DMI was reduced by fertilization. The rumen concentrations of NH3 were higher in F than in NF in both periods. In both periods, the effective DM degradability of forage was higher in F than in NF. N fertilization affects chemical composition, voluntary intake and rumen digestion of forage from rye pasture. 相似文献
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甘草黄酮对小鼠急性肺损伤保护机制的研究 总被引：2，自引：2，他引：2
为了研究甘草黄酮对非特异性肺部损伤小鼠的预防和治疗作用,采用脂多糖(LPS)滴鼻法建立了小鼠急性肺损伤模型。分别于造模前1 h和造模后1 h给予甘草黄酮(30 mg/kg)。在LPS滴入后6、12、24 h检测支气管肺泡灌洗液BALF中的细胞因子水平;测定肺组织湿干重(W/D)比率,观察肺部组织学的病理变化;并用Western-blot方法检测NF-κB水平变化。结果表明：甘草黄酮可以显著降低肺组织的W/D比率,减轻肺组织中炎性细胞的浸润,抑制肿瘤坏死因子α (TNF-α)、白细胞介素6(IL-6)和白细胞介素1β(IL-1β)等炎性细胞因子的产生,而且治疗的效果要优于预防的效果。Western结果显示：甘草黄酮可以显著抑制IκB的降解以及NF-κB向核内的转移,从而抑制了LPS下游的常见通路,即NF-κB信号通路,由此我们得出结论,甘草黄酮对LPS诱导的ALI小鼠具有保护作用,其治疗效果要好于预防效果,同时其保护机制与NF-κB信号通路的抑制相关。 相似文献
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不同土壤pH对多叶羽扇豆花色影响研究 总被引：1，自引：1，他引：0
以5种不同土壤pH的蓝色多叶羽扇豆（Lupinus polyphyllus ‘Nanus Russell Gallery Blue’）为材料,对其花色、花色素组成及含量的变化进行了研究。花色测定采用英国皇家园艺学会比色卡（RHSCC）和分光色差计,色素定性及定量分析采用高效液相色谱-二极管阵列检测技术（HPLC-PAD）和分光光度计进行测定。结果发现：随着土壤pH的降低,花朵翼瓣亮度L*值、色相a*值、彩度C*值逐渐降低,色相b*值逐渐升高,总花青苷、叶绿素含量升高;旗瓣中总花青苷也逐渐升高,其他各检测结果无明显相关性。推断土壤酸碱性影响蓝色多叶羽扇豆花瓣中花青苷的含量,从而影响花色的深浅。 相似文献