辽宁省燕麦优化栽培技术研究

以＂沈农燕麦一号＂为试材,采用二次四因子二次通用旋转组合设计,研究辽宁省适宜燕麦生长的播种密度和肥料施用量。结果表明：在产量≥3000kg/hm2的147个方案中,播种量在174.00～185.25kg/hm2,N、P2O5、K2O施用量分别为135.75～152.25kg/hm2、37.35～41.10kg/hm2、110.40～121.05kg/hm2,可获得3581.25kg/hm2以上的产量,N∶P2O5∶K2O最适比例为3.67∶1.00∶2.95。     

Changes in the genetic structure of Bacteria and microbial activity in an agricultural soil amended with tannery sludge

The application of tannery sludge to soils is a form of recycling; however, few studies have examined the impacts of this practice on soil microbial properties. We studied effects of two applications (2006 and 2007) of tannery sludge (with a low chromium content) on the structure of the bacterial community and on the microbial activity of soils. We fertilized an agricultural area in Rolândia, Paraná state, Brazil with different doses of sludge based on total N content, which ranged from 0 to 1200 kg N ha⁻¹. Sludge remained on the soil surface for three months before being plowed. Soils were sampled seven times during the experiment. Bacterial community structure, assessed by denaturing gradient gel electrophoresis (DGGE), was modified by the application of tannery sludge. Soon after the first application, there was clear separation between the bacterial communities in different treatments, such that each dose of sludge was associated with a specific community. These differences remained until 300 days after application and also after the second sludge application, but 666 days after the beginning of the experiment no differences were found in the bacterial communities of the lowest doses and the control. The principal response curve (PRC) analysis showed that the first sludge application strongly stimulated biological activity even 300 days after application. The second application also stimulated activity, but at a lower magnitude and for a shorter time, given that 260 days after the second application there was no difference in biological activity among treatments. PRC also showed that the properties most influenced by the application of tannery sludge were enzymatic activities related to N cycling (asparaginase and urease). The redundancy analysis (RDA) showed that tannery sludge’s influence on microbial activity is mainly related to increases in inorganic N and soil pH. Results showed that changes in the structure of the bacterial community in the studied soils were directly related to changes of their biological activity.     

高职院校计算机应用基础课程改革初探

探讨了高职院校计算机应用基础课的发展方向及如何进行课程改革,提出了以工作任务、学生就业为导向,增强学生的职业能力,这也是高职院校在教育中有着不可替代性的地位的体现。     

水稻沟箱栽培技术在高海拔地区的应用效果综述

水稻沟箱栽培技术是利川市在水稻半旱式栽培技术的基础上进行总结简化,解决水田＂冷、烂、毒＂矛盾,提高水稻单产的主要技术措施,在利川市推广应用增产效果明显。     

2种石灰岩特有植物的特性及园林应用

圆叶乌桕（Triadica rotundifolia）和报春苣苔（Primulina tabacum）是石灰岩特有植物,具有较高的学术、观赏和经济价值。文章从形态特征、分布、生态习性及繁殖等方面对圆叶乌桕和报春苣苔进行介绍,并阐述其园林观赏及应用价值。     

益生菌产表面活性剂研究进展

生物表面活性剂是由微生物代谢过程中产生的具有表面活性的生物化合物,大多具有抗细菌、真菌、支原体和病毒的特性以及抗粘附的功能。由益生菌产的生物表面活性剂,除具备上述功能,还在安全性方面具有独特优势,因此在预防和治疗某些疾病方面具有广阔的应用前景。本文针对产生物表面活性剂的益生菌的种类、筛选、产物的制备分离及应用等方面做一综述。     

赤峰市优质肉牛饲养管理技术规程的应用

优质肉牛产业化在内蒙古赤峰市畜牧业发展中占有重要地位。肉牛业的发展对于调整优化畜牧业结构、增加农牧民收入、振兴国民经济等都有着非常重要的现实意义。《赤峰市优质肉牛饲养管理技术规程》是指导农牧民进行肉牛养殖的科学性、规范性、可操作性的技术规程,该规程有利于肉牛业可持续、健康、稳定发展,可以更好地推广应用肉牛饲养管理、繁殖改良、饲料调制、育肥等技术,可加快肉牛产业化、规模化、集约化、现代化发展的进程。     

西瓜测土配方施肥试验

以西瓜新品种"凯旋"为试材,研究了测土配方施肥在西瓜上的应用效果。结果表明:测土配方施肥能促进植株生长,提高光合速率,增强植株光合能力,改善西瓜品质,提高西瓜产量,可增产20.55%,同时提高了收获后的土壤肥力。     

太湖地区常见湿地植物种类及应用探讨

通过对太湖周边地区湿生植物的调查,常见的湿生植物种类有70多种,有一定的观赏价值、可以使用的湿地植物有40余种.对部分太湖地区常见的湿生植物观赏特点进行了描述.湿生植物的应用应以乡土湿生植物为主;并对湿地生态系统重建过程中应注意的问题,湿地植物选用原则,重建湿地生态系统后的植物养护等问题提出了看法和建议.     

生物反应堆技术在榆林市设施蔬菜上的应用效益分析

以生物反应堆技术在温室番茄和黄瓜栽培中的应用为实例,分析生物反应堆技术在榆林市设施蔬菜上的应用效益.结果表明:与对照相比,在这2种作物生产中,不仅提高了其品质指标,而且分别提高种植农户纯收益达46.33％和40.22％,且有利于改善农业生态环境.