不同储存条件对鹿茸总糖和水溶性蛋白的影响

为探讨鹿茸最佳保存条件,将鹿茸置于常温、冷藏、冷冻和干燥4种条件下,分别测定储存初期、储存40d、3个月和6个月时鹿茸中总糖和水溶性蛋白含量。结果显示,鹿茸储存过程中总糖和水溶性蛋白含量均呈下降趋势。对于鹿茸总糖,储存40d,冷冻条件对总糖保存有利;储存3个月,干燥条件对总糖保存有利;储存6个月,冷冻条件对总糖保存有利。对于鹿茸水溶性蛋白,储存40d,干燥条件对水溶性蛋白保存有利;储存3个月,冷藏条件对水溶性蛋白保存有利;储存6个月,冷冻条件对水溶性蛋白保存有利。从而推断,冷冻储存条件对保存鹿茸有利。     

利川市山区马铃薯规模化种植的实践与思考

为了探索出一种独具特色的马铃薯规范化、规模化种植模式,基于利川市山区马铃薯规模化种植基地建设情况,结合利川市实际情况,按照优质高效、农旅融合的农业高质量发展要求,对推进马铃薯规模化种植的经验进行总结,提出加强科技支撑、优化发展模式、做好新型职业农民培训、创新管理模式、强化品牌效应的建议。     

ELISA法测定番茄茎叶中的褪黑素含量

为了研究植物内源褪黑素与植物抗性的关系,以4叶1心的番茄幼苗为试验材料,采用酶联免疫吸附测定(ELISA)法测定正常番茄、鱼腥草提取液和灰霉菌侵染后的番茄茎叶中的褪黑素含量。结果表明:番茄叶片和茎的褪黑素含量分别为14.53、2.80 ng/g,二者之间差异极显著,叶片的褪黑素含量是茎的5.19倍;经鱼腥草提取液预处理和灰霉菌侵染后,番茄叶片的褪黑素含量显著增加,鱼腥草提取液预处理有助于减轻番茄叶片上的灰霉病发病症状,但并不依赖于叶片内源褪黑素含量的增加。可以检出的番茄茎叶中的褪黑素含量高于2.60 ng/g,就灵敏度而言,ELISA法完全可以用来检测番茄的组织器官的褪黑素含量。     

吉林省栗山天牛专项调查技术报告

栗山天牛专项调查结果表明,栗山天牛是我省目前发生面积最大、危害最重、造成经济和生态损失最大的林业有害生物。通过专项调查,全面掌握了栗山天牛在吉林省的分布面积、发生面积和成灾面积,并将栗山天牛的分布、发生与成灾面积落实到了具体林班和小班。为进一步监测栗山天牛的发生、发展趋势与危害情况提供了基础数据,为制定栗山天牛防治对策提供了科学依据。     

非洲鸵鸟粪便中大肠杆菌的分离与鉴定

为探讨非洲鸵鸟（Struthio camelus）腹泻是否与大肠杆菌有关,以9羽非洲鸵鸟粪便为研究对象,将纯化培养后的细菌进行革兰氏染色、细菌形态学鉴定、生化鉴定。结果表明,2～9号菌株在麦康凯培养基生长为红色、湿润的圆形菌落,1号菌株在麦康凯培养基生长为白色透明、湿润的圆形菌落;革兰氏染色均为阴性,镜检均为红色杆菌;9株菌株均能发酵葡萄糖、甘露醇、阿拉伯糖、麦芽糖,大部分菌株能分解山梨醇、乳糖、鼠李糖、蔗糖、棉子糖,1株菌不能发酵乳糖且在麦康凯培养基上呈白色透明菌落,所有菌株均不能利用硫化氢、枸橼酸盐,所有菌株VP试验、尿素反应均为阴性,所有菌株MR试验、吲哚试验均为阳性,9株被检菌株均为大肠杆菌。     

水稻梯田土壤速效氮、磷、钾的迁移与分布特征研究

研究水稻梯田氮、磷、钾速效成分迁移与分布规律,为实现精准配方施肥提供依据。选择白石村10个有水稻梯田分布的村民小组,每个村民小组为一个采样区,按照水流路径,每个采样区梯田分成6层,每层采用“S”形布点法采集5个土样,分别测定土壤的碱解氮、速效磷和速效钾含量,并建立与梯田层次间的函数关系式,研究其横向迁移分布情况与规律。结果表明：白石村土壤主要养分平均含量：碱解氮103.3±13.67 mg/kg、速效磷42.84±5.42 mg/kg、速效钾95.25±13.91 mg/kg,营养等级为中上;碱解氮、速效钾从上层梯田向下层梯田迁移,并有显著的指数回归趋势,平均相关系数分别为0.9719和0.9885,低洼地氮素含量偏高;速效磷纵向迁移不明显,但其含量与碱解氮含量呈负相关,拟合度为72.72%。白石村水稻梯田碱解氮、速效钾含量随着水流由上层向下层迁移,并具有明显的指数回归趋势;速效磷随水流迁移不明显,分布相对稳定,有富集倾向。     

超级杂交稻国稻1号农艺性状研究

对超级杂交稻国稻1号和杂交稻汕优63的株型特征以及农艺性状进行了比较分析,结果表明:国稻1号的单产之所以显著高于汕优63的,主要因为前者分蘖多且分蘖快,单位面积有效穗数和每穗总粒数多,而且结实率高。     

Off-target glyphosate deposits from aerial silvicultural applications under various meteorological conditions

Aerial spray applications of the herbicide glyphosate were made over a forest canopy under various meteorological conditions. A ‘Thru Valve Boom’ dispersal system carried by a Cessna 188 fixed-wing aircraft flying at 49 m s^?1 was used to generate an aqueous spray cloud with a volume median diameter of 150 μm. Glyphosate deposits from multiple overlaid crosswind line sources released at 10 m above ground level were measured on ground sheets and artificial foliage at downwind distances between 50 and 400 m. Trials were conducted in stable, neutral and unstable atmospheric boundary layers with average wind speeds between 2·2 and 5·7 m s^?1 and vertical intensities of turbulence between 0·07 and 0·16. Linear regression lines fitted to logarithmically transformed measurements and downwind distances (x) gave statistically significant correlation coefficients (P = 0·01), and were compared by ANOVA. Glyphosate deposits on ground sheets and artificial foliage were attenuated at rates inversely proportional to x to the power 1·7-4·3. Regression line comparison showed that, in general, deposits on ground sheets decreased with increasing wind speed and intensity of turbulence, and some statistically significant differences were found in slopes and elevations of regression lines from different trials. However, deposits at the 50-m station increased with wind speed due to the large-drop cloud component. Regression line comparison for deposits on artificial foliage showed that, in general, they were highest in the intermediate wind speed-neutral stability case and similar in the high wind speed-unstable and low wind speed-stable boundary layers, although deposits at the 50-m station also increased with wind speed.