刚性暗管结构形式与排水性能关系的三维电模拟研究

作者选用电解液模型对农田排水暗管的五种结构处理进行了三维渗流测试，揭示了其渗流场的基本形态及势场变化规律，定性地描述了此五种暗管结构排水性能的优劣，同时采用能综合反映暗管排水性能的流量系数值，对不同结构在各种参数组合条件下的排水性能作了定量的分析对比，结合以往室内砂槽试验成果，提供了合理的暗管结构设计依据。此外，应用保角变换法求得了仅有纵缝和全管壁进水的两种结构的二维渗流量解析式，并通过对试验资料的统计分析和线性回归分析法推导出三维渗流量的近似计算式。     

生态核不育大麦花粉的扫描电镜观察

对生态核不育大麦不育株和可育株的成熟花粉以及对照品种８９０９和鄂啤２号的成熟花粉进行了扫描电镜观察，发现生态核不育大麦不育株和可育株均含有空秕状和圆形、饱满两类花粉；两对照品种的花粉为圆形、饱满类型。生态核不育大麦可育株的圆形花粉与对照品种花粉一样，其萌发孔有明显突出的孔盖；而生态核不育大麦不育株的圆形花粉则无孔盖。因此，可认为萌发孔孔盖的有无是生态核不育大麦可育与不育花粉的典型鉴别特征。     

卧螺离心机在餐饮行业废水处理中的工艺研究

指出了餐饮行业产生的废水（泔水）可以作为一种资源被回收利用,探讨了通过工艺上的改进,采用卧螺离心机对泔水进行规模化分离处理,达到高效分离的目的,从而使泔水得到＂资源化＂的分类处理。     

Factors influencing the survivorship of the burrowing nematode,Radopholus similis (Cobb.) Thorne in two types of soil from banana plantations in Martinique

The burrowing nematode, Radopholus similis (Cobb.) Thorne, causes the most damage to bananas. To minimize nematicide applications, cropping systems that use fallow, crop rotation and clean planting material have been developed in the French West Indies. In order to optimize the benefit of the intercropping period, we studied the survivorship of R. similis in different soil types and conditions. We monitored the survivorship of calibrated populations of R. similis in the laboratory on a Nitisol and on an Andosol, two soils derived from volcanic ashes and pumices. We studied water potentials ranging from 0 to ?700 kPa on undisturbed soil and on soil previously frozen to get rid of living nematodes. Mortality of adult R. similis decreased regularly, and was fairly well described by Teissier's model. In the previously frozen soils, R. similis survived longer in wet soils (half-life of 21–46 days at 0 to ?5 kPa) than in dry soils (half-life of less than 10 days between ?80 and ?250 kPa). In contrast, in undisturbed soils, R. similis survived longer in dry soils: half-lives ranged from 57 days at ?273 kPa to 17 days at water saturation in the Andosol, and 36 days at ?660 kPa to 14 days at water saturation in the Nitisol. These results are consistent with the absence of anhydrobiosis in R. similis, unlike Pratylenchus coffeae. P. coffeae survivorship curves over time do not follow a model derived from exponential decrease like Teissier's model. These results also show that the recommended one year host-free period required to sanitize soils cannot be shortened without risk, even if flooding the soil could improve it.     

Iron and zinc accumulation in winter wheat regulated by NICOTIANAMINE SYNTHASE responded to increasing nitrogen levels

Nitrogen (N) is critical for micronutrient biofortification in wheat grain and is essential for a series of nitrogenous compounds biosynthesis. This study aims to assess the role of improved N supply in iron (Fe) and zinc (Zn) enrichment and expression of genes related to Zn and Fe chelation and transport in winter wheat. Potting and hydroponic culture experiments were conducted to study the effect of increasing N application on Zn and Fe uptake and translocation from roots to leaves and the temporal and spatial gene expression profiles of the NICOTIANAMINE SYNTHASE (NAS) genes in wheat. Plants were grown with low, medium and high N supply levels. The results showed that higher N application increased Fe and Zn content in leaves, and decreased Fe and Zn content in root compared with the lower N supply. High N application also increased the distribution of Fe and Zn from roots to leaves. Expression analysis showed that increased N application resulted in up-regulation of two wheat NAS genes, TaNAS1 and TaNAS2. Highly positive response between NAS genes and increasing N application indicated that abundance nicotianamine (NA) resulted from highly expressed NAS genes might involve in the chelation of Fe and Zn in the phloem and favor Fe and Zn uptake and accumulation in wheat leaves.     

辽宁省大连市深松整地机械技术规范

介绍辽宁大连地区的几种深松机具的使用特点,操作要点以及使用注意事项。     

朴实无华写丰碑——专访山东鲁西兽药股份有限公司总经理刘长德

作为一本专业的饲料杂志刊登一篇采访兽药企业掌门人的文章,编辑本是有一些小小的迟疑的,但是换一个角度想,既然是采访企业领导者,不管他经营的是什么,企业运营、市场开拓等方面总有相通之处,况且兽药行业与饲料业也同属农牧业产业链条上的一环,这么算来,我们的采访应该也说得上顺理成章了,所以我们采录了这篇文章,以飨读者。     

甘肃河西走廊地区的水与绿洲

作者以河西走廊地区为实例，论述了绿洲的形成与演变，尤其以绿洲的形成与水资源的密切关系，并以水资源为根据，推断了河西走廊绿洲发展的规模与方向。