渭北旱塬70年来冬小麦品种更替中光合特性的研究

通过田间试验测定不同小麦品种整个生育期光合特性以及灌浆期光合特性的日变化.结果表明,随着渭北旱塬小麦品种的改良,不同品种生育后期旗叶净光合速率(Pn)呈递增趋势,现主推品种长旱58灌浆期Pn、蒸腾速率(Tr)、气孔导度(Gs)都处于较高水平,日均Pn达11.58 μmol·m-2·s-1,较40年代品种五指麦提高了3....     

杂交早稻新组合金优418在江西试种表现及高产抛栽技术

金优418是江西九洲种业有限公司用金A与自育恢复系洲恢418杂交配组而成的杂交早稻新组合。2008年12月通过江西省农作物品种审定委员会审定（赣审稻2008043）。介绍了该组合2008年江西试种表现及高产抛栽技术     

水稻钵秧行抛机的研究

以２ＺＲＢ－６型水稻行抛机为基础对齿反式水稻钵行抛机的总体方案设计,送秧排序机构的工作原理进行了论述。通过对该机构理论分析,并通过台架及田间试验验证,进行了优化设计,达到理论与实际机型的统一。     

低分子量脲醛树脂浸渍速生杨木工艺初步研究

采用木材真空加压浸渍处理专用设备,较系统地研究了浸渍压力和浸渍时间对杨木增重率的影响规律。结果表明:浸渍压力和时间对杨木增重率有很大影响;在本研究范围内,随着浸渍压力的提高和浸渍时间的延长,增重率呈现先快速增长后趋于平缓的趋势,增重率最高可达到36.6%;从节约时间和能源成本方面综合考虑,选定本试验的优化浸渍工艺为浸渍压力1.0 MPa、浸渍时间2 h。     

水稻机制钵苗抛秧机的研究

对２ＳＰ－１０型水稻机制钵苗抛秧机的总体方案设计、自动排序机构、定量抛秧机构进行全面论述和重点理论分析，并提供了有关技术参数供参考。     

不同淹水程度对长江滩地枫杨组织比量的影响及变异

研究结果表明：在径向上,阉水1个月和2个月的两组间,除导管比量变化趋势基本相反外,纤维比量、轴向薄壁组织比量和木射线比量变化趋势相近似。在轴向上,两组间纤维比量和木射线比量随树高的增加变化趋势相反,导管比量和轴向薄壁组织比量随树高的增加变化趋势相似。第一组和第二组的纤维比量分别为65．89％、62．7％;木射线比量分别为12．22％、15．07％。经T－检验,在0．05水平上,纤维比量和木射线比量在两组间差异显著,而导管比量和轴向薄壁组织比量差异不显著。     

机械手式水稻钵苗移植机传动系统设计

对机械手式水稻苗移植机的总体传动设计，横向进给传动机构进行了全面论述，提供了传动系统图，并对系统进行了运动分析，列出了传动结构式和运动平衡方程式。     

人工林杨木木材强化研究发展现状及趋势

分析了人工林主要树种杨木的发展情况以及国内外木材强化研究技术的概况和研究进展,为更好地研究人工林杨木强化技术提供借鉴.     

Effect of wide spacing on tree growth, branch and sapwood properties of young Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] in south-western Germany

The influence of stand density on Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] is conceptually understood, but for wide spacings not well quantified, particularly in Europe. This study used 41 trees from 7 different locations in south-western Germany to compare important tree- and branch-level attributes across three different densities, namely 100, 200, and 1,200 stems ha⁻¹. In general, there were only a few tree and branch attributes that were significantly different between the 100 and 200 ha⁻¹ densities. Crown projection area and diameter of the thickest branches were the most important differences between the 100 and 200 ha⁻¹ densities. The most obvious and significant differences in this study were between 100 and 1,200 ha⁻¹ densities, where nearly every examined tree and branch attributes were statistically significant. However, relative sapwood area, the number of branches, branch angle, and the occurrence of spike knots were insensitive to stand density. Although the two lowest stand densities in this study represent rather extremely wide spacings, these results still have important implications for the development of effective thinning regimes for Douglas-fir in south-western Germany. Important management recommendations from this study include thinned stands should be maintained to at least 200 stems ha⁻¹ to maintain high log quality and stand stability. Furthermore, even at stand densities exceeding more than 1,200 trees ha⁻¹ planted trees, artificial pruning may even be necessary to produce high quality logs.     

生产茶园种茶原理的探索

过去我场将非叶用作物种植特点用于种茶,违背了种茶原理,长期种茶效果较差。笔者利用我场种茶正反经验和有关大量资料,将种茶的感性认识提高到理性认识,揭示了种茶原理。该原理主要内容是：笔者通过植物生理学认识到茶树营养生长要求碳、氮营养要平衡,笔者通过生物学认识到只要茶园施肥量符合茶园的留叶量,就能使茶树碳、氮营养达到平衡,使茶树碳、氮比值控制在茶树营养生长范围以内,才能有效地控制茶树的生殖生长,保持营养生长,才能不断的长出幼嫩芽叶而多采茶。