Visits to the U.S. Bureau of Reclamation from South Asia and the Middle East, 1946–1990: An indicator of changing international programs and politics

International study programs have contributed to the diffusion of modern irrigation technologies, approaches, and problems. But the patterns and processes of international travel have received little attention to date. This paper examines foreign visits to the US Bureau of Reclamation (USBR) from South Asia and the Middle East from 1946 to 1990. Using data from the Foreign Activities Branch of the USBR, we compare the participation rates from 16 countries in South Asia and the Middle East. India, Turkey, and Egypt had the highest rates of participation, followed by Pakistan, Iran, and Israel. The frequency of visits is influenced by political, economic, cultural, and institutional factors. But the most important factors appear to be foreign relations and geopolitics. Given the problems faced by national irrigation bureaucracies around the world, there is a need to focus more directly on political factors than in the past.     

樱桃番茄新品种示范与评比试验

为了筛选出适合延庆地区种植的高产、优质、抗性强的设施樱桃番茄新品种,促进品种更新换代,引进了4个樱桃番茄新品种进行春大棚越夏一大茬生产评比试验。结果表明：番茄1843开花、坐果较早, 株高、茎粗生长势较强,成熟果实颜色粉红色、汁液较多、可溶性固形物含量较高,667 m2产量和效益均最高,分别为3 051 kg和13 141元,且抗病性、连续坐果性较强,口感、品质较优,适宜在延庆地区春大棚进行越夏茬栽培种植。     

美国食用菌产业发展报告

通过利用美国农业部、农业统计局及相关行业网站发布的产业数据、新闻报道和研究报告,对美国食用菌产业的变化趋势及其原因进行梳理。结果发现,随着生产效率的提高美国食用菌产量和产值逐年提高,但通过不断的兼并收购,食用菌生产者的数量明显下降。在政府组织和行业自发的行业组织和协调下,美国食用菌行业竞争有序,食用菌价格稳定,食用菌产业创造了良好的经济、社会和生态效益。美国是世界食用菌生产强国,研究美国食用菌生产和消费变化趋势,了解食用菌产业组织的活动和经验,有助于引导我国食用菌产业的健康发展。     

鸡粪沼液复合微生物有机肥在温室樱桃番茄上的应用效果研究

为了探讨鸡粪沼液复合微生物有机肥在樱桃番茄上的田间应用效果,在滴灌施肥的条件下,设置化肥和液体复合微生物有机肥两个处理进行对比应用,结果表明施用液体复合微生物有机肥的处理其单果重可提高39.69%,含糖量可提高11.94%,茎粗可提高8.76%,Vc含量可提高5.72%,产量可提高30.95%,节约成本1.32%,可有效促进作物生长,提高果实着色均匀度,提高作物抗病性。同时,土壤速效氮提高6.87%,土壤速效磷46.23%,土壤速效钾提高16.86%,有机质含量提高12.64%,为作物提供了良好的生长环境。说明液体复合微生物有机肥对作物产量、品质以及土壤改良均有显著的提升作用,具有一定的应用前景。     

高压静电预处理技术对番茄保鲜的影响

研究了高压静电预处理后的番茄在保鲜过程中的呼吸强度、抗压强度以及失重情况的变化规律。结果表明，利用电场强度为150kV/m的高压静电场预处理番茄45min后，可使自然条件下番茄的呼吸高峰推迟4d后出现，并发现高压静电预处理能有效地保持番茄较高的表面抗压强度和较低的失重率，延长番茄的贮藏保鲜时间。     

《中南林业调查规划》性质及学科分类

根据期刊性质和学科分类方法,以文献数量对《中南林业调查规划》进行分类,以明确其性质和学科归属。研究表明,《中南林业调查规划》2010年刊登的论文以学术性为主,林业类文献占当年文献总量的的56.52%,其余学科文献量较少,不能划入相应学科,因此应将该刊归类为林业类专业学术期刊。     

黑色/长梨形樱桃番茄种质的研究利用

以樱桃番茄黑褐色圆形自交系Z1、红黑色长梨形自交系Z2、红色圆形、浅粉红色扁圆形、
橙黄色长椭圆形和黄色圆形等自交系为试材，进行不完全双列杂交配制组合。通过对杂交组合后代的农艺
性状、品质特性和抗病性等的调查研究，探究黑色樱桃番茄种质品质改良和长梨形果形的利用，为今后特
殊果形果色番茄种质的创新利用提供参考。结果表明：樱桃番茄果色黑色性状为隐性性状；亲本为圆形果
或扁圆形果×长梨形果、长椭圆形果×长梨形果时，F₁ 果形分别是椭圆形与长指形。     

Exogenous Nitric Oxide Involved in Subcellular Distribution and Chemical Forms of Cu~（2＋） Under Copper Stress in Tomato Seedlings

Nitric oxide（NO）,a bioactive signaling molecule,serves as an antioxidant and anti-stress agent under abiotic stress.A hydroponics experiment was conducted to investigate the effects of sodium nitroprusside（SNP）,a NO donor,on tomato seedlings exposed to 50 μmol L-1CuCl 2.The results show that copper is primarily stored in the soluble cell sap fraction in the roots,especially after treatment with Cu＋SNP treatment,which accounted for 66.2% of the total copper content.The copper concentration gradually decreased from the roots to the leaves.In the leaves,exogenous NO induces the storage of excess copper in the cell walls.Copper stress decreases the proportion of copper integrated with pectates and proteins,but exogenous NO remarkably reverses this trend.The alleviating effect of NO is blocked by hemoglobin.Thus,exogenous NO is likely involved in the regulation of the subcellular copper concentrations and its chemical forms under copper stress.Although exogenous NO inhibited the absorption and transport of excess copper to some extent,the copper accumulation in tomato seedlings significantly increased under copper stress.The use of exogenous NO to enhance copper tolerance in some plants is a promising method for copper remediation.     

新隆优一号在皖南地区高产制种技术研究

介绍了宣城市的自然气候特征以及新隆优一号亲本特征与特性，分析了高产制种技术要点。     

番茄裂果的原因及防治对策

番茄生产过程中,由于肥料的使用不当和水分灌溉多少直接影响番茄的裂果现象,针对出现番茄裂果,找出具体原因后对照症状,及时防治.