品种更替对冬小麦磷素养分吸收累积和利用效率的影响

选用１４个在不同时期推广的冬小麦品种进行田间试验，分析没生育期不同器官，部位植物样本的磷素含量。结果表明，各时期品种不同器官，部位中磷素含量随生长发育进程的推进均逐渐降低。生育前期，植株体内磷含量较高，成熟期最低；冬小麦植株对磷的吸收累积动态一致；随品种的更替，叶片，叶鞘中的磷素输出率增加，总输出磷的贡献率反而降低，磷收获指数增大。     

盆景换土的细节

盆景养护是一项需要细致和耐心的工作,无论在施肥,摘芽,剪枝,换土等等的工作方法,必须要靠多累积经验与深深体会和全身心的投入。换土是其中最基本的工作,也是最容易被忽视的工作,笔者仅就累积经验与体会分析其中的细节问题。换土为盆景养护的最基本也是最重要的内容,主要是指根系整理和更换新土壤两项工作。为了让盆栽树木表现出力度和保持最小化的体积,我们刻意截断了它的许多根系,仅仅用了很少的土壤来种植它,只为了控制它体积的过度成长,从而使在地栽中不容易出现的一些微小的问题很容易被暴露     

我省又一批农作物新品种通过审定(续)

棉花新品种 四、川杂12 1.品种来源四川省农科院经作所选用自育双抗两用系抗A2,与湖北惠民种业有限公司太湖农科所提供的抗虫系R168配制的棉花杂交新品种.高梁新品种.     

The Studies on the Grunting of Sows during Nursing and the Sucking Behaviour of Piglets

Two experiments were carried out to study the grunting of sows during nursing and the sucking be-haviour of piglets. In experimental I,six Yorkshire sows and their litters were observed and managed in farrowing crates.In experimental Ⅱ,six Harbin White sows and their litters were selected and housed in farrowing pens.The behaviours and activities of the sows during nursing and the actities of piglest during sucking were recorded with a portable video camera (PanasonicNV-VX22EN)The results showed that the characteristic patterns of grunting by the sows consist of an initial period of rhythmic grunting at a fairly constant rate and followesd by a period of more rapid grunting,and then a decline in grunting rate toward the completion of nursing.The pattern of vocalization showed by the mothers bears a reliable synchronization to the sucking behaviour of the piglets.The rate of grunting varied little during jostling for teat and nosing the udder.The beginning of slow sucking usually occurred during of just after the increase in grunt rate.The rapid sucking began 15-25seconds after the period of most rapid grunting,fol-lowingthe decrease of grunt rate.afterwards the nursing ended.There were individualities found in sows‘grunting patterns.It is found that vocalizations attracted the piglets to the sows and synchronized sucking activities of piglets,but the results indicated that the premassaging time and numbers of piglets enagaing massaging influ-enced the grunting pattern and the onset of the milk ejection.As more piglets were involved the massaging,the higher the grunting rate peak,the faster the milk ejection.     

甜菜43cm垄距栽培模式初探

将甜菜行株距65cm×20cm改为行株距43cm×25cm，试验结果表明：甜菜根产量、含糖率和产糖量分别提高45．1％～61．8％、0．6～0．8度和50．8％-70．4％。农民和企业分别增收2851-3931元／hm^2和2835-3930元／hm^2。     

地面平养肉杂鸡大肠杆菌与沙门氏菌混合感染的防治

肉杂鸡,以其肉质细腻、风味独特、品质优良备受市场的欢迎;以其增重快、出栏时间适中、饲料转化率高、抗逆性强,饲养方便,经济效益好备受养殖户的青睐.     

“三农”热线

湛江李姓农户问：冬春气温低，鸡舍内湿度大。如何预防鸡舍潮湿？ 答：可采取以下8点措施防鸡舍潮湿。（1）合理选择建舍场址，要选择地势高、干燥、利于排水防涝、环境安静、利于通风的地方建鸡舍。（2）冬春气温低，控制通风量，并适宜加强通风换气。（3）鸡群拥挤不堪，不利于防潮，地面平养鸡群尤其应注意饲养密度适宜。（4）杜绝饮水器具漏水、清除鸡舍地面积水。     

投资者意见分歧对盈余公告效应影响的实证研究

从投资者意见分歧的角度对盈余公告效应进行理论解释,借鉴衡量投资者意见分歧的模型对中国股票市场的盈余公告效应进行实证检验,研究结论认为:我国的股票市场表现出了明显的盈余公告效应.投资者意见分歧对盈余公告效应具有很好的解释作用.在研究期内,投资者意见分歧与股票组合的累积异常收益率呈正相关关系.     

浅谈GPS与导线混合建网方法在矿区控制中的应用及数据处理

本文详尽的讨论了GPS联合导线混合控制的建网方法在矿区测量中的应用以及采集传输数据后内业处理的一般方法与技巧。为GPS与导线混合控制建网提供了具体的实践经验和可行性研究。