T型杂种小麦主要农艺性状亲子相关分析

T 型杂种小麦的研究在经历了近30年的研究历程之后,取得了重大进展,所谓杂种恢复度与恢复系恢复力问题已基本得到解决,国内外均有 T 型杂种小麦进入较大面积的生产。选配强优势组合以及探讨强优势组合选配规律则成为目前 T 型杂种小麦研究的重点内容之一。     

苏云金杆菌与杀灭菊酯防治红铃虫的试验

苏云金杆菌(Bailus thuringiensis)140或018工业菌剂每亩用200～255克,加杀灭菊酯20%乳剂每亩8毫升混用防治第二、三代红铃虫,虫口减退率和铃害下降率分别为80.5～93.4%和68.8～84.6%;杀灭菊酯每亩40毫升单用效果分别为96～97.2%和84.6～95.8%,都能有效控制红铃虫的危害。棉花产量测定表明,菌剂加菊酯混用使皮棉增加21.3～30.9%,菊酯单用增加11.4%。     

Re-defining tillage erosion: quantifying intensity–direction relationships for complex terrain

Abstract. Current tillage erosion models account for the influence of tillage direction in the magnitude of the soil (tillage) transport coefficient. It is argued here that this is counter-intuitive and causes significant problems in modelling tillage erosion in areas of complex terrain. This article examines whether a re-modelling of tillage erosion is possible that separates tillage direction (an interaction with the landform) from the soil transport coefficient (a measure of tillage intensity representing the combination of implement erosivity and soil erodibility). Experimental data for mouldboard ploughing upslope, downslope and cross-slope at Coombe Barton Farm, Devon are examined. Integration of data for all directions into a single relationship, which relates translocation in the direction of tillage to slope in the direction of tillage and translocation perpendicular to tillage to slope perpendicular to tillage, is not possible using previously published methods of analysis. However, when total translocation distance is regressed against the tangent of the slope at 45° to the tillage direction (bisecting the tillage direction and the direction of overturning) it is found that a single relationship can be used to describe tillage in all three directions. Therefore, this relationship is used to determine a single value of the soil transport coefficient ( k _fTa) for constant soil and implement conditions but different tillage directions. This redefinition of tillage is important both for true estimation of tillage erosion severity, the adirectional coefficient being 40% larger than the directional coefficient, and for modelling of tillage erosion in complex terrain. These improvements are vital when tillage erosion simulation is used to direct soil conservation strategies.     

乐业县茶叶生产现状和发展前景

乐业县位于广西百色市西北部,云贵高原的边缘,属喀斯特地貌峰丛,东靠河池市的天峨县,南依百色市凌云县,西北与贵州省罗甸县隔河相望,西南与百色市田林县毗邻,是百色通往贵阳最为便捷的中转站.……     

山楂缺铁黄叶病及应用硝黄铁防治研究

根据调查初步总结出山楂缺铁黄叶病的发生发展规律、致病因素及其对山楂生产的危害。用新研制的高效价廉、储运方便的硝黄铁矫治,效果明显。黄化病株复绿率40%～87%,三级病株减少36%～100%,叶绿素含量提高64%～224%,喷肥区比对照区株产提高25%。同时增加了果实中糖、酸、果胶及钙、铁含量,提高了果实品质。     

多菌灵及漂白粉液处理桑叶对原蚕卵及杂交后代的影响

研究了用多菌灵及漂白粉液消毒过的桑叶饲养育原蚕对其产卵及后代杂种的影响。结果表明：能有效防止家蚕微粒子的食下传染，对原蚕的生长发育、健康性、产卵等均无不良影响；对杂种后代的生长发育、生产性能及茧丝质也不无不良影响。多菌灵的控微效果与桑叶全程浸消的效果基本一致，但其操作比桑叶全程浸消简单、省时、省力。     

七星瓢虫幼虫空间分布型及抽样技术研究

采用颍次分布X~2检验、Iwao平均拥挤度m~*=a+βx和Taylor幂法则S~2=am~b等8种方法,分析了七块麦田中七星瓢虫幼虫的空间分布型,认为其分布型为负二项分布,且聚集的原因是由于个体之间存在着相互吸引,并确定了代表性较强的棋盘式抽样技术,最佳抽样数量为:Q=28.7088/+0.7552。     

60日龄肉鹅发生小鹅瘟的诊治

吴川市板桥镇某养鹅专业户饲养的一群肉鹅，６０日龄时发生一种以下痢、脱水死亡为特征、伴有阵发性抽搐及扭头神经症状的疫病。经诊断检查，确诊为小鹅瘟病，现将诊治情况报告如下：１发病情况２０００年４月１９日，该专业户共购进雏鹅１８７只，１日龄时注射抗小鹅瘟血清，每只鹅１ｍＬ，育雏期间共死亡３只，尚余１８４只。养至６月１８日时发现病鹅１只，２０日病鹅发展到５只，并出现死鹅１只。至２２日时共发病１０只，死亡５只。发病期间，鹅主曾用土霉素、青霉素、禽菌灵等多种抗菌药物进行治疗，但效果均不理想。２　临床症状　病…     

加强通风和喷雾降温对奶牛生产性能的影响

黑白花奶牛是耐寒怕热的家畜，适宜温度范围44～211℃，产奶最适宜温度10℃，当环境温度自21℃升高至35℃，产奶量将大幅下降，乳的组成亦发生变化。合肥地区属于亚热带季风气候，夏季温度高达35℃以上，极端最高温度达40℃，奶牛长时期处于这种环境中，高温引起热应激反应，散热困难，体温升高，采食量减少，增加散热的能量消耗和体蛋白质的分解，造成内分泌活动和酸碱平衡失调乃至死亡。为降低热应激对奶牛生产的影响，我场在夏季采用强制通风和喷雾的措施，可提高奶牛单产达20％的显著效果。1 材料与方法11 喷雾设备111 加压泵…     

影响啤酒大麦种子发芽整齐度的因素

综述影响啤酒大麦种子发芽整齐度的因素 ,着重介绍了品种、籽粒整齐度 (包括粒重和粒位 )对发芽整齐度的影响 ,旨在为培育优质啤酒大麦提供借鉴。