Potential production simulation and optimal nutrient management of two hybrid rice varieties in Jinhua,Zhejiang Province,China

Potential growth of two widely-grown hybrid rice varieties in the Jinhua district of Zhejiang Province, Shanyou63 for mid-rice and Xieyou46 for late rice, was simulated using a crop growth model of WOFOST. Parameters of the rice growth in WOFOST were calibrated through field experiments from 1999 to 2002 in Jinhua. The potential yield simulated with WOFOST was about 12 t/ha for Shanyou63 and 10 t/ha for Xieyou46, which are in good agreement with the highest recorded yield obtained in this area. Under farmers practice, current yield is about 7.5 t/ha for Shanyou63 and 6.5 t/ha for Xieyou46. There is a gap between the actual rice yield and the potential yield for these two hybrid rice varieties grown in this area. The attainable target yields were set to 70% to 75% of their potential yields for the two varieties. A recently developed software ＂Nutrient Decision Support System （NuDSS）＂ for irrigated rice was used to optimize nutrient management for these two rice varieties. According to NuDSS, the optimal fertilizer N requirement for the target yields was about 150 kg/ha for Shanyou63 and about 120 kg/ha for Xieyou46, which were only about 70% of the fertilizer N application under current farmers＇ practice. Comparing with farmers＇ practice, there is great potential to increase actual rice yields and to reduce fertilizer N use rates by improving rice crop management practice in Jinhua.     

Communicating feedback in teaching practice supervision in a learning-oriented field experience assessment framework

This article seeks to understand the ways in which feedback was communicated in post-observation conferences in teaching practice supervision within the learning-oriented field experience assessment (LOFEA) framework. 32 post-observation conferences between 21 pairs of supervisors and participants of in-service teacher education programmes, and interviews with supervisors and participants were analyzed, with findings revealed in four themes:

1.

The distribution of content and nature of feedback in post-observation conferences;     

多杀菌素对蓟马的室内毒力测定及田间药效试验

研究了0．5％多杀菌素对蓟马的室内毒力测定和田间药效试验。结果表明,其室内测定LC50为5．37μg·mL^-1,田间7d防治效果为91．11％。说明其有较好的防治效果,持效期在7d以上,对蓟马的推荐使用剂量为26．25—37．5g·ha^-1。     

循环冗余校验算法的FPGA高速实现

介绍了循环冗余校验原理,并以CRC-16生成多项式为例,用Verilog HDL硬件描述语言描述该算法.采用Quartus Ⅱ 8.0进行综合、仿真,并用Cyclone Ⅱ系列的EP2C35F672C6器件适配和编程下载,在DE2开发板上实现.该CRC模块既是CRC校验生成模块,又是CRC校验检错模块.另外,该CRC模块还可以封装成具有Avalon总线接口的自定义组件IP核,从而可以重复利用.实验结果表明,该校验器速度快,占用资源少,并在实际中得到了应用.     

水稻P1B型ATPase重金属转运蛋白的结构与功能研究进展

P1B型ATPase重金属转运蛋白（HMA）广泛存在于低等植物和高等植物中,参与植物生长发育过程中所必需的微量金属营养元素的运输.与双子叶植物拟南芥（Arabidopsis thaliana）AtHMA1-8的大量研究相比,单子叶植物中HMA转运蛋白的相关功能与研究极其有限.根据已有的研究成果对水稻（Oryza sativa L.）体内9种HMA转运蛋白的分类、结构、分子机制与转运功能进行了详细对比和归纳,对这些重金属转运蛋白在植物中的组织分布、亚细胞定位和金属特异性进行了阐述,推测了目前尚未明确功能的OsHMA1、OsHMA4、OsH-MA6、OsHMA7和OsHMA8的亚细胞定位及潜在的转运功能,以期为未来进一步的科学研究提供更多依据.     

光敏核不育水稻花粉形态和育性稳定性及转换

对HPGMR农垦58A进行育性转换的稳定性研究,用扫描电镜观察其花粉外部形态。结果表明,长日诱导的值株及短日割蔸再生分蘖,在长日下均表现雄性不育,结实率分别为0.76％和0.00％;短日诱导及对照组植株雄性可育,结实率分别为40.59％和38.19％;长日诱导的花粉外形明显皱缩,不含内容物,属典败型花粉;而短日诱导的花粉除极少量皱折外,大多呈圆型而充实,内容物饱满。     

我国高校野外生存生活训练课程研究现状分析

本文以我国野外生存生活训练课程研究学术论文为研究对象,从时间分布、期刊分布、课题情况、作者分布、研究方法和研究内容等方面对我国野外生存生活生活训练课程研究现状进行了分析。结果表明,在野外生存生活课程日益受到学者、各类课题和期刊重视的同时。也存在课程实践偏少的情况。提出部分有条件的高校应开设野外生存生活训练课程,并建设野外生存生活训练课程实践基地,同时也不能偏离高校体育改革与发展的方向。     

第29届奥运会田径比赛实力分析

采用文献资料法、数理统计法、比较法对第29届奥运会田径比赛各项目前三名成绩和田径比赛奖牌分布、以及中国运动员成绩进行统计分析发现：本届奥运会田径比赛奖牌的分布具有明显的地球、项目特征;中国虽然积分排名进步,但中国整体实力较差局面没有改变。     

高校田径课中面临的问题及对策

田径在学校体育中占有较大的比重,是教学的主要内容之一。然而随着学生自主权、选择权的出现,拥有丰富内容的田径课却开不起来,这是为什么？ 通过对这一问题的探讨,旨在为今后的改革、为学生终身体育的形成提供有益的思路     

高师体育教育专业乒乓球选修课教学模式的实验研究

采用调查法、教学实验法、数理统计法等 ,对高师体育教育专业乒乓球选修课教学模式进行改革实验 ,结果表明 ,“导学型”教学模式对培养学生的创新意识 ,提高学生的教学能力 ,实现素质教育 ,满足现实社会对体育教师的需求有重要意义