生长激素对猪生长、胴体组成及肉质的影响

选用体重６４ ｋｇ 左右的大大二三元杂种猪１８ 头， 随机分为２ 组， 试验组和对照组各９ 头。试验组每头每天肌肉注射猪生长激素（ｐＳＴ）５ ｍｇ ，共１４ ｄ， 对照组肌注生理盐水。饲养结束时进行屠宰测定， 取背最长肌进行肉质分析。结果表明： ｐＳＴ 处理组平均日增重显著高于对照组（ Ｐ ＜ ０－０５） ， 料重比下降２１－６８ ％ ， 胴体重提高２－６２ ％ ， 三点膘厚下降７－７８ ％ ， 肝重提高１４－８６％ ， 心重提高１８－０７ ％ ， 肌肉失水率提高１２－６８ ％ ，切割力提高１－６８ ％ ， 大理石纹提高１５－０９ ％ ， 但差异均不显著（ Ｐ ＞ ０－０５） 。ｐＳＴ 对其它指标均无显著影响     

NPK用量及基追养分分配对烟叶产质量的影响研究

为了提升烟叶产质量,明确石灰性紫色土烤烟营养均衡的施肥体系,2018—2019年,采用大田正交试验的方式,研究氮磷钾（NPK）不同用量及NK基追不同配比对农艺性状、产量、化学指标等的影响。试验结果表明:（1）NPK施用量对烤烟农艺性状有显著影响,N对SPAD和化学成份有显著影响,N和P对产量有显著影响,且产量与N施用量成正相关;（2）N₂P₃K₂ (97.5、150、315 kg/hm²)为广元烤烟种植的最佳施肥组合;（3）氮肥前移,钾肥后移的施肥方式更用利于提高烟叶内在质量。广元烤烟栽培营养均衡施肥体系:N、P₂O₅、K₂O施用量分别为97.5、150、315 kg/hm²,氮、钾基肥与追肥养分分配比:N_基:追=7:3、K_基:追=3:7。     

Assessment of wheat variety stability using SSR markers

In International Union for the Protection of New Varieties of Plants member countries, assessment of wheat variety stability is a statutory requirement before new varieties are registered and plant breeders’ rights are granted. However, it is impossible to test the stability of varieties accurately and quickly, or to assess the stability of a large number of varieties in a short time based on the morphological traits defined by the national standard. The objective of this study was to establish method and procedure of wheat variety stability assessment using SSR markers as a replacement for morphological observations. In preliminary study, the methods to identify non-homozygous SSR loci and calculate the homozygous SSR loci ratio (SSR–HLR) of wheat varieties were established. On this basis, the genotypes at 347 molecular markers loci of 20 advanced lines demonstrated that SSR–HLRs were 84.7–94.8 % in the F₄ lines, 96.1–99.4 % in the F₅ lines, and ≥98 % in the F₆ lines, respectively. Eighty of 347 markers with good polymorphism, stable PCR amplification, and high resolving power of genotyping were recommended to detect SSR–HLR for 633 wheat regional trial varieties. Comparing morphological observation, the varieties with SSR–HLR >95 % were deemed stable; the varieties with SSR–HLR <91 % were deemed unstable; the varieties with SSR–HLR ranging from 91 to 95 % were required field identification for stability assessment. Based on the relationship between the homozygous SSR loci ratio and wheat variety stability, procedures for the assessment of wheat variety stability using SSR markers were established.     

应用耗散结构理论分析苏北沿海棉花生产创新发展的可能性

耗散结构理论横跨自然科学和社会科学,具有高度的抽象性和普遍的适用性。本文运用这一理论观点,分析苏北沿海地区棉花生产创新发展的可能性。提出开放性是苏北沿海棉花生产的基本特征;打破平衡是苏北沿海棉花生产创新发展的前提;非线性作用是苏北沿海棉花生产创新发展的基础;涨落机制是苏北沿海棉花生产创新发展的动因。     

农业科研机构管理机制分析——以中国热带农业科学院为例

文章针对中国热带农业科学院14个科研单位进行问卷调查，并用SPSS软件进行频数、列联表、相关性和回归分析发现：科技道德约束机制，科研激励机制，科技创新、协作和竞争机制，人才培养机制等农业科研机构管理机制间相辅相成，互为递进作用，科研管理过程中应全面协调科技道德、科研激励、科技创新、协作、竞争和人才培养间的相互关系，以调动科研人员的协作和竞争意识，发挥人才作用，尊重和保护科研人员创新能力，保证科研机构健康发展。     

剪切历史对西部管道外输吐哈油物性的影响

针对目前西部原油管道冬季运行特点,对管输加剂吐哈油经管流剪切和过泵高速剪切后的物性变化规律进行研究,结果表明:吐哈油经加剂综合热处理后凝点显著降低,可以满足鄯善首站的外输要求,但油流经历沿线温降、管流剪切和过泵高速剪切到达玉门站时,进站凝点明显升高;沿线加剂吐哈油的物性取决于其所处的温度区间、经历管流剪切过程中管流剪切力和蜡晶分子间力的相对大小以及经历过泵高速剪切前后蜡晶分子结构力的相对大小;其中,翠岭-安西站间油流温度低于12℃,管流剪切和过泵高速剪切对加剂吐哈油的凝点影响较大,使其凝点上升、物性变差。     

马拉硫磷原药的气-质联机分析

本文采用GC—MS联用仪、EI电离源、HP-5MS型毛细管柱，通过外标法对马拉硫磷原药主成分进行定量分析，并结合质谱图对原药中所含杂质进行定性分析。结果表明，马拉硫磷浓度在1.5～10mg／LCE围内，线性相关系数为0．9994，标准偏差为0．93，变异系数为1．0％，平均回收率为99．13％。     

论现代居住小区园林绿化

运用生态园林的观点,满足居住区的功能要求,创造风景优美的居住环境,这是设计者不懈追求的目标。     

Analysis of moisture diffusivity of larch timber during convective drying condition by using Crank＇s method and Dincer＇s method

Two analytical procedures （Crank＇s method and Dincer＇s method） for porous solid materials were reevaluated and used to determine moisture diffusion coefficients and moisture transfer coefficients for larch lumber subjected to drying. A diffusion-like equation was used to describe drying process data. The lumber was idealized in the modeling as infinite plates. The moisture transport process inside the board was assumed to be one-dimensional. The macroscopic drying kinetics curves of larch timber at particular conditions were determined experimentally. Based on these data, calculation for both the moisture diffusion coefficients and moisture transfer coefficients by the Dincer＇s analytical procedure were made. The dynamic moisture diffusion coefficients by the traditional Crank＇s method were calculated. In general, diffusion coefficients calculated by the Dincer＇s method were all higher than those by Crank＇s method. These results could be due to the differences between two analytical methods and also different characteristics between solid moisture diffusion process and heat transfer process. Therefore the analysis and solution procedures of moisture diffusion differential equations need to be adapted in the future. With drying temperature＇s increasing moisture diffusion coefficient （D） and moisture transfer coefficient （k） increases accordingly. Also the relationships between diffusion coefficients and temperature as well as material moisture contents were analyzed by using Arrhenius equation and bound water transport theory.