6个葡萄品种（系）抗旱性比较研究

比较6个主栽或杂交育种常用品种（系）的抗旱性差异,为旱区葡萄栽培品种和抗旱育种亲本选择提供依据。在干旱胁迫下,测定各植株生长量、旱害、叶片水势、电导率及胁迫后根系状况,研究各品种（系）间的抗旱性强弱。结果表明,严重胁迫下,‘弗雷无核’和‘无核白鸡心’生长受重创,旱害严重,电导率变化大,根系生长不良,个别干枯;‘温宿红葡萄’、‘新郁’、‘无核白’表现相对较好,‘SP522’次之。‘温宿红葡萄’、‘新郁’、‘无核白’抗旱性强,‘SP522’次之,‘无核白鸡心’和‘弗雷无核’弱。     

日光温室甜瓜主要病虫害综防措施

<正>一、霜霉病1.危害症状幼苗和成株均可发病,主要危害叶片、茎、卷须,花梗也能受害。幼苗发病,子叶正面出现不匀的黄化褪绿斑,然后变成不规则枯萎斑。空气潮湿时,病斑背面产生紫灰色霉层。成株期发病多从下部叶片开始,初期在叶片上出现绿色小斑点,并逐渐变为黄     

奶牛胎衣不下的预防与治疗

母牛产犊后12h仍未排出胎衣,称为胎衣不下.本病是奶牛最常见的产科疾病之一,据不完全的调查,发病率在18％～25％之间,给奶牛业造成严重危害,可继发子宫内膜炎,导致产间距延长,甚至屡配不孕,降低奶牛经济效益,还可造成奶牛流产或者引起乳房炎和代谢疾病的发生.因此,预防和治疗胎衣不下,是奶牛生产中不可忽视的问题.1 发病原因1.1 日粮搭配不平衡,微量元素缺乏,导致母牛产后子宫收缩力减弱,引起胎衣不下.1.2 奶牛运动不足,新陈代谢缓慢,降低了对营养物质的吸收利用,使子宫的支持组织松驰,腹壁张力降低而胎衣不下.1.3 母牛过肥或过瘦,产道狭窄,或者母牛阵缩无力而胎衣不下.1.4 流产、早产、母体胎盘愈合导致胎衣不下.1.5 双胎、胎儿过大、羊水过多造成难产,人工助产而损伤子宫引起胎衣不下.     

黑龙江省规模化生态养猪场典型示范技术总结

为深入落实<黑龙江省五千万头生猪规模化养殖战略工程规划>,促进黑龙江省生态养猪法的推广应用,提高生猪规模化、标准化养殖水平,解决畜禽排泄物污染环境问题,增加农民收入,加快新农村建设步伐,黑龙江省畜牧兽医局于2009年5月份将黑龙江省畜牧研究所定为生态养猪典型示范单位,主要负责商品育肥猪的饲养试验,共进行2个阶段的试验...     

致作者

?A g r i c u l t u r a l B i o t e c h n o l o g y?(中文译名《农业生物技术》)是由美国国会图书馆主管,美国Wu Chu(USA-China)Science and Culture Media Corporation?中文译名:吴楚(美中)科技文化传媒公司】主办的全英文期刊,ISSN刊号:2164-4993,暂为双月刊,刊物内容包括与农业科学相关的植物、动物、微生物及林业、海洋等学科在组织、器官、细胞、染色体、蛋白质、基因、酶、发酵工程等不同水平上的农业     

Phosphorus accumulation and leaching risk of greenhouse vegetable soils in Southeast China

Over-fertilization has caused significant phosphorus(P) accumulation in Chinese greenhouse vegetable production(GVP) soils. This study, for the first time, quantified profile P accumulation directly from soil P measurements, as well as subsoil P immobilization, in three alkaline coarse-textured GVP soil profiles with 5(S5), 15(S15), and 30(S30) years of cultivation in Tongshan, Southeast China. For each profile, soil samples were collected at depths of 0–10(topsoil), 10–20, 20–40, 40–60, 60–80, and 80–100 cm. Phosphorus accumulation was estimated from the difference in P contents between topsoil and parent material(60–100 cm subsoil). Phosphorus mobility was assessed from measurements of water-soluble P concentration(PSol). Finally, P sorption isotherms were produced using a batch sorption experiment and fitted using a modified Langmuir model. High total P contents of 1 980(S5), 3 190(S15), and 2 330(S30) mg kg~(-1) were measured in the topsoils versus lower total P content of approximately 600 mg kg~(-1) in the 80–100 cm subsoils. Likewise, topsoil PSol values were very high, varying from 6.4 to 17.0 mg L~(-1). The estimated annual P accumulations in the topsoils were 397(S5), 212(S15), and 78(S30) kg ha~(-1) year~(-1). Sorption isotherms demonstrated the dominance of P desorption in highly P-saturated topsoils, whereas the amount of adsorbed P increased in the 80–100 cm subsoils with slightly larger P adsorption capacity. The total P adsorption capacity of the 80–100 cm subsoils at a solution P concentration of0.5 mg L~(-1) was 15.7(S5), 8.7(S15), and 6.5(S30) kg ha~(-1), demonstrating that subsoils were unable to secure P concentrations in leaching water below 0.5 mg L~(-1) because of their insufficient P-binding capacity.     

Rising utilization of stable isotopes in tree rings for climate change and forest ecology

Analyses of stable isotopes(C, O, H) in tree rings are increasingly important cross-disciplinary programs. The rapid development in this field documented in an increasing number of publications requires a comprehensive review. This study includes a bibliometric analysis-based review to better understand research trends in tree ring stable isotope research. Overall, 1475 publications were selected from the Web of Science Core Collection for 1974–2023.The findings are that:(1) numbers of annual pu...     

IFA和ELISA检测J亚群禽白血病病毒的比较研究

为比较3种禽白血病病毒(ALV)抗原检测ELISA试剂盒的特异性和灵敏度,将J亚群禽白血病病毒(ALV-J)传染性克隆rNX0101株以病毒原液(9×103TCID50)、10倍病毒稀释液(9×102TCID50)、100倍病毒稀释液(90 TCID50)接种培养于6孔板的DF1细胞,每孔均提前放入灭菌的细胞爬片,于接种后第1~6天每天取上清用3种ELISA试剂盒(A、B、C)检测ALV p27抗原,同时在接种后的第3天和第6天取出细胞爬片进行间接免疫荧光法(IFA)检测。结果表明,IFA方法对高、中、低剂量接种3 d后均可检出ALV-J的感染,而ELISA试剂盒中只有A试剂盒在高剂量接种时才能检出,试剂盒B和试剂盒C最早要在第4天才可检出;中、低剂量接种,3种试剂盒在第4~5天才能检出;第6天时,由于病毒的明显复制,无论IFA方法还是3种ELISA试剂盒都可检出ALV-J的感染。本研究结果为正确选择商品化禽白血病抗原检测试剂盒提供了借鉴。     

Ground vegetation,forest floor and mineral topsoil in a clear-cutting and reforested Scots pine stands of different ages: a case studyOA

Scots pine( Pinus sylvestris L.) is a dominant tree species on nutrient-poor sandy soils in the Baltic region’s hemiboreal forests. A final clear-cut in commercial stands is a common practice. However, the maintenance of relatively stable vegetation indices and ecological processes throughout the rotation promote new scientific and social debates. Overall, clear-cuttings disturb forest functions for a certain period, i.e., phytocenoses with forest-based species composition, biodiversity, and veg...