Response of Mustard to Ethrel Spray and Basal and Foliar Application of Nitrogen

In a field trial conducted during 1992–93 and 1993–94, the effect of basal (B) nitrogen (N) (45 and 60 kg N ha⁻¹) and foliar application (F) of water (W) or 10 kg N ha⁻¹ and 400 or 600 ppm ethrel (E) (2-Chloro ethyl phosphonic acid) at 70 days after sowing was studied on leaf area index and dry mass at 90 days and pod number per plant, seeds per pod, 1000 seed weight, seed yield, oil content and oil vield at harvest of mustard ( Brassica juncea L. Czern & Coss.) cv. T-59. Recommended basal (B) application of 90 kg N ha (BN₉₀) was used as control. On the basis of 2 year data it was found that basal application of 60 kg N and foliar spray of 10 kg N ha ⁻¹ and 600 ppm ethrel gave higher values for growth and yield characteristics and enhanced seed yield and oil yield by 12.5 and 14.8%, respectively over control BN_90.     

膨化血粉饲喂生长犬的效果试验

选择健康的2月龄生长犬40只，随机分为3个试验组(A，B，C)和1个对照组(D)，试验组分别饲喂添加5％，10％和15％膨化血粉的复合饲料，对照组饲喂添加8％鱼粉的复合饲料，进行30d饲哏试验。试验结果表明：A，B，C组与时照组相比日增重分别提高18．97％，2．17％和-13．55％；肉料比降低了19．62％，6．19％和-7．69％。     

素质教育应注重人的思维创新能力的培养和提高

本文论述了培养大学生的科学思维方式和提高他们的创新能力及其在素质教育中的重大意义。     

跑车带锯机列的电气改造

本文通过对木工跑车带锯机列摇尺制动和摇尺操纵的电器改造，实现了摇尺自控和跑车摇控。提高了木材出材率，改善了工人的劳动条件。     

我国经济林应对绿色技术壁垒的战略

我国经济林发展很快，但由于产地生态破坏、环境污染以及林农的不良耕作等原因，使按常规方式生产的产品安全质量下降，从而遇到了绿色技术壁垒的严峻挑战。只有抓住机遇，认真实施无公害生产，开发安全森林食品，才能拓展产品的国际国内市场，使我国经济林产业开发再上新台阶。     

小麦远缘杂交后代节燕98-2分离类型贮藏蛋白的研究

采用A-PAGE和SDS-PAGE聚丙烯酰胺凝胶电泳方法,对远缘组合分离出来的节燕98-2类型入选11个遗传性基本稳定的具有高产、多抗的小麦株系的醇溶蛋白和高分子量谷蛋白亚基进行了分析.结果表明,在A-PAGE电泳分析中,11个供试株系具有11种不同的醇溶蛋白带型.在SDS-FAGE电泳分析中,出现了7种不同的高分子量谷蛋白亚基(HMW-GS)及6种亚基组合类型,优质亚基及亚基组合所占的比例较少,品质评分偏低,其变幅为5～8分,平均为6.36分.但在所分析的材料中,出现了一个少见的特殊亚基:2 10 12.并研究了这些HMW-GS和组合频率及特点.11个株系中7个具有45 10优质亚基和2个具有2*亚基,它们可供小麦优质育种利用.研究表明,通过远缘杂交能够选育出具有高产、抗病和优质的小麦新材料.     

Development of a semi-selective medium and an immunofluorescence colony-staining procedure for the detection of Clavibacter michiganensis subsp. sepedonicus in cattle manure slurry

Various compounds and basal media were tested for their suitability to create a semi-selective medium for isolation ofClavibacter michiganensis subsp.sepedonicus (Cms) from cattle manure slurry containing c. 10⁸ colony forming units (cfu) per ml.Plating efficiency of Cms in yeast glucose mineral medium (YGM) was 104% compared with yeast peptone glucose medium. Nalidixic acid, polymyxin B sulphate and the experimental disinfectant S-0208 inhibited colony growth of cattle slurry bacteria as compared with Cms in YGM. The optimal concentration of these inhibitors in combination was determined by modified agar diffusion tests and by pour plating in 24-well tissue culture plates. The semi-selective medium YGMI consisted of YGM supplemented with nalidixic acid (2 mg/l), polymyxin B sulphate (30 mg/l) and S-0208 (125 mg/l). Plating efficiency varied for Cms between 50.9 and 69.6%, for cattle slurry bacteria between 1.8 and 2.5% and for saprophytes from potato heel end extracts between 11.5 and 27.4%.Differentiation of Cms colonies from other colonies was based on their small and bluish colony morphology in pour plates and on immunofluorescence colony-staining (IFC). IFC of a pure culture of micro colonies of Cms in YGM was possible after one day incubation (colonies c. 5 cells). Green background fluorescence in the agar gels was prevented by addition of Tween 20 (0.1%) to the washing buffer and the use of 1% agar gels. IFC of macro colonies of Cms in YGMI, visible with 4x objective magnification, was possible after 4 days. The detection level of the target organism in artificially inoculated cattle slurry in YGMI based on colony morphology varied between 1.4×10³ and 2.3×10⁴ cfu per ml of cattle slurry. Miniaturized plating combined with IFC, using wells in tissue culture plates (=16 mm), proved suitable for detection, but was c. 30 times les sensitive. The recovery of Cms was negatively correlated with the number of saprophytic colonies in the agar plates (R ²=0.74).     

“复激保果剂”在杂交水稻制种上应用技术总结

复激保累剂,在杂交稻制种上使用,能促使花器发育良好,调节父母本花期,提高结实率,增加每穗实粒和粒重,提高产量。且成本低,有显著的经济效益。     

不同干燥失水方式对云南温带优良牧草营养品质的影响研究

采用迅速烘干、太阳晒干和缓慢烘干3种处理对云南温带21个牧草品种的鲜草进行干燥处理,分别测定干草的营养成分。结果表明:以干草的粗蛋白含量为指标,干燥方法以迅速烘干为佳,其次是太阳晒干,最差是缓慢烘干;从干草的粗脂肪考虑,其变化无规律,因牧草品种的不同而不同;其余指标变化不大。