高速公路道路建设中土壤侵蚀问题研究

系统地分析了高速公路工程施工期土壤侵蚀发生原因、机制以及引起土壤侵蚀外来动力因素等,并以此对土壤侵蚀进行分类,总结了道路建设中水土流失的特点和危害.指出了其与传统土壤侵蚀的区别,最后建议工程建设过程中的一些水土保持应依据自身特点确定防治范围.     

Developing a duplex ARMS-qPCR method to differentiate genotype Ⅰ and Ⅱ African swine fever viruses based on their B646L genes

<正>Africanswinefever(ASF),causedbythe African swine fever virus (ASFV), is an acute, hemorrhagic, and contagious disease of domestic pigs and wild boars.The disease is notifiable and listed by the World Organization for Animal Health (WOAH)(Wang N et al. 2019).     

软包装酱制猪肘的制作技术

猪肘在前肢中轴部位,大群肌肉拉动肢体活动,此处肌肉丰富,而脂肪含量又相对较少,古人把该部位的肉块誉之为肉中上品.随着旅游业的发展,各种包装的肘口类产品纷纷应市,尽管这个部位的肉块肉质上乘,但不能忽略的问题是骨骼粗大,其质量约占整个部位的1/3强,一些制作单位出于猪肘完整的考虑,将产品作整个包装使净含量多达800g.     

猪的口腔输液法及其应用

在发展商品猪基地建设中,笔者在临床上经常遇到刚引入不久的苗猪或架子猪,由于饲养管理条件改变极易发生高热或腹泻之类的病状,如能及时治疗多能康复。在治疗时往往要辅以静脉输液,藉以促进康复。特别是当病程较长时随着体液的减少,血液变得浓稠、心脏博动无力、血管充盈度也低。多次静脉经药后寻找针位困难,缓慢流动的血液常凝固而堵塞针孔,在输液中还要时时提     

肉猪屠宰废物作饲料

本场系自繁自养场,以往,屠血、胃内容物、小肠食糜在作业中狼藉满地,严重污染环境。为珍惜资源,达到既净化环境,又化废为宝的目的,我们进行了小试验和大面积试验,试验表明,经处理后使用的这类废物可作为饲料使用,现报告如下。     

平衡施肥及其对豫西旱地冬小麦水分利用率的影响

A study on balanced fertilization was conducted by means of long-term field experiments,and a conve-nient table for balanced fertilization was compiled.The experimental results about the effect of fertilization on water use efficiency of upland wheat showed that the input of inorganic fertilizer should be reduced in dry years.     

中国三种典型土壤结皮的发育过程与机理

To compare the development of physical crusts in three typical cultivated soils of China, a black soil (Luvic Phaeozem), a loess soil (Haplic Luvisol), and a purple soil (Calcaric Regosol) were packed in splash plates with covered and uncovered treatments, and exposed to simulated rainfall. Meshes covered above the surfaces of half of soil samples to simulate the effects of crop residue on crusting. The results indicated a progressive breakdown of aggregates on the soil surface as rainfall continued. The bulk density and shear strength on the surface of the three soil types increased logarithmically as rainfall duration increased. During the first 30 min of simulated rainfall, the purple soil developed a 7--8 mm thick crust and the loess soil developed a 3--4 mm thick crust. The black soil developed a distinguishable, but still unstable, crust after 80 min of simulated rainfall. Soil organic matter (SOM) content, the mean weight diameter (MWD) of soil aggregates, and soil clay content were negatively correlated with the rate of crust formation, whereas the percentage of aggregate dispersion (PAD), the exchangeable sodium percentage (ESP), and the silt and sand contents were positively correlated with crusting. Mechanical breakdown caused by raindrop impact was the primary mechanism of crust formation in the black soil with more stable aggregates (MWD 25.0 mm, PAD 3.1%) and higher SOM content (42.6 g kg^-1). Slaking and mechanical eluviation were the primary mechanisms of crust formation in the purple soil with low clay content (103 g kg^-1), cation exchange capacity (CEC, 228 mmol kg^-1), ESP (0.60%), and SOM (17.2 g kg^-1). Mechanical breakdown and slaking were the most important in the loess soil with low CEC (80.6 mmol kg^-1), ESP (1.29%), SOM (9.82 g kg^-1), and high PAD (71.7%) and MWD (4.6 mm). Simulated residue cover reduced crust formation in black and loess soils, but increased crust formation in purple soil.     

生猪巨型颌下淋巴肉瘤的诊断报告

生猪的宰后检验淋巴肉瘤多见于淘汰种畜,而商品猪的检出数稀少。最近,我们在到货检验中发现一例两侧性颌下淋巴肉瘤,由此对病因、发病经过去实地作了一些调查,报告如下: