紫色土流失区造林技术

紫色土流失区造林技术是在划分流失地类型的基础上,采取生物和工程措施相结合的方法,适地适材选择造林树种。流失区适宜造林树种以侧柏为主,辅以建柏、闽粤栲、火力楠等树种。     

优化"思想道德修养"课教学效果的探索

分析当前“思想道德修养”课教学存在的问题,以及影响“思想道德修养”课教学效果的因素,提出明确教学定位、改善教学内容、采用多种教学方式方法、完善教与学的评价体系,是推进“思想道德修养”课教学改革,优化其教学效果的可行办法。     

结合农业科学的乡土地理研究性学习对教师的积极影响

针对高中乡土地理研究性学习具有充分的开放性、深刻的探究性和丰富的实践性特征,结合教育学和心理学的理论基础作指导,探索结合农业科学的乡土地理研究性学习,强调利用地理知识在解决现实问题中的优势,活跃了教学科研氛围,为教师形成自己的独特个性的教学风格奠定了良好的理论基础.     

聚氨酯材料烤房的应用研究

[目的]研究聚氨酯材料烤房的烘烤性能,降低烟叶烘烤成本.[方法]将聚氨酯材料烤房与普通密集烤房的控温效果、烘烤效果以及烘烤成本进行比较分析.[结果]试验表明,2种材料烤房无差异,平面温差均随着温度升高稍有扩大,各层的平面温差均在0.2～0.5℃,烤房分风均匀,但聚氨酯材料烤房的垂直温差略平稳;2种材料烤房烘烤效果均较好且差异较小;聚氨酯材料烤房的经济效益、耗煤量、耗电量、用工优于普通烤房,但聚氨酯材料烤房的建造成本高于普通烤房,然其使用寿命较长.[结论]聚氨酯材料烤房性能较优,具有较好的应用前景.     

Assessing the potential use of two portable chlorophyll meters in diagnosing the nutritional status of plants

The SPAD-502 and the FieldScout CM 1000 chlorophyll meters were compared in their performance in diagnosing the nutritional status of plants. Leaves of a wide range of greenness were used to push the sensitivity of the tools to their limits. Both devices showed high reproducibility when used by different operators. The SPAD-readings were well-correlated with leaf nitrogen (N) concentrations, since leaves from heavily fertilized plants were not included in the sample population. The FieldScout-readings showed a marked saturation curve with the leaf N concentration, thus it cannot be used as a reliable N nutritional status index. The results also showed that the use of SPAD-502 in the diagnosis of the nutritional status of an orchard requires the establishment of specific critical concentrations for cultivars and sampling dates. The SPAD-502 appeared to have potential in the diagnosis of the nutritional status of the orchard for nutrients other than N.     

不同类型烤房的烘烤效果研究

[目的]为了解烟叶基地单元内不同类型烤房烘烤效果。[方法]在烤烟品种云烟87主产区,对卧式密集烤房、气流下降式小型密集烤房、气流上升式小型密集烤房和普通烤房的烘烤成本、初烤烟叶质量、经济效益、建造成本和建造占地情况等进行了调查研究。[结果]卧式密集烤房、气流下降式小型密集烤房、气流上升式小型密集烤房每千克干烟烘烤能耗分别比普通烤房降低8.8%、30.1%和7.4%,上中等烟比例分别比普通烤房提高4.9%、3.0%和3.7%,烤后烟叶的净产值分别比普通烤房提高13.7%、18.0%和14.7%,平均占地面积分别比普通烤房减少31.5、37.5和33.0 m2/hm2。其中,气流下降式小型密集烤房相对占地面积小、能耗低,烟叶净产值较高。[结论]3种密集烤房不仅相对烘烤能耗低、相对占地面积小,而且上中等烟比例、烟叶外观质量、均价、产值等均优于普通烤房。     

不同氮源的配方施肥在烤烟生产上的应用效果

不同氮源的配方施肥在烤烟生产上的试验结果表明：适当调节铵态氮与硝态氮比例确，能提高烤烟产量、产值、均价及经济效益，其中处理B（复合肥 硫酸钾即50%NH4^ -N 50%NO3^- -N）优于其它处理，与对照相比，产量提高5.15%，产值提高12.36%，均价提高6.86%,增加效率为14.33%。     

思想政治教育实效性刍议

思想政治教育存在课程内容陈旧老化和实效性差的问题，解决的方法是提高教育的知识素养，以适应新形势下的教育要求；增强教育内容的针对性，使之具有较强的感染力和时效性；在教育实践中尊重学生的个性和自主性，激发学生的参与意识和主动的介入能力。     

孵化期间鹅种蛋失重及其孵化效果的研究

本试验通过对不同品种鹅种蛋在孵化过程中的失重及孵化效果进行研究。结果表明,种蛋1 d~28 d平均失重率以莱茵鹅最高,与豁鹅、籽鹅比较差异显著(p<0.05),而豁鹅与籽鹅比较,差异不显著(p>0.05)。受精率以莱茵鹅最高,与豁鹅比较差异达到了显著水平(p<0.05),与籽鹅比差异极显著(p<0.01)。受精孵化率籽鹅与豁鹅、莱茵鹅比较,差异分别达到了极显著水平(p<0.01)和显著水平(p<0.05)。入孵蛋重与28d胚蛋重呈强正相关,失重率随蛋重增加而降低;蛋重越大,初生重也随之增大。     

Modelling repeated competition records in genetic evaluations of Danish sport horses

Genetic evaluations of sport performance typically consider competition records of ranking points in each competition, accumulated lifetime points or annual earnings. Repeated observations have the advantage of allowing for adjustment of effects associated with each competition such as rider experience, judge and competing horses, but also demands more computer capacity than single‐trait records, which could prohibit multiple‐trait evaluations. The aim of the study was to compare CPU times, estimated breeding values (EBVs), reliabilities and model prediction abilities when modelling repeated competition ranking points (run A), mean ranking points (runs B and C), mean ranking points precorrected for effects associated with each competition (run D) and accumulated lifetime points (run E) for Danish Warmblood horses. CPU times for run A were 632–776 times (show jumping) and 59–96 times (dressage) as high as for runs B–E. EBVs of run D were perfectly correlated (1.00) with those of run A. Reliabilities were highest in runs E and A. Best model prediction ability and least bias were found in run C (dressage) and run E (show jumping), but the best choice in each discipline was not preferable for the other. Run D was the second best in both disciplines (D), and is expected to increase in performance over time as omission of a relatively large amount of historic data becomes less important.