不同覆盖方式对梨园土壤物理性状和树体生长的影响

2011—2013年,对8年生早酥梨园进行地膜覆盖、玉米秸秆覆盖和地膜+玉米秸秆覆盖等不同方式处理,研究其对梨园土壤物理性状及树体生长的影响。结果表明:连续覆盖3年后,早酥梨园土壤物理性状发生显著变化;地膜覆盖处理明显提高了土壤温度,玉米秸秆覆盖则降低了土壤温度;3个覆盖处理均显著提高了土壤含水量、有机质含量、土壤孔隙度,有效降低了土壤容重;3个覆盖处理对增加树体生长量和产量有显著效果。     

哺乳母猪乳房炎的防治措施探讨

哺乳母猪乳房炎是带仔泌乳母猪一种常见疾病,也是一种严重影响养猪经济效益的一种疾病。该病由多种原因引起,包括机械性、和微生物感染等多种因素,常发生于产后5～30 d,多发于1个或几个乳腺,临诊上以红,肿,热,痛及泌乳减少,拒绝哺乳为特征。母猪的肠道菌性乳房炎发病率较高。     

附子不同株系比较试验

以68份附子株系为研究对象,对农艺性状进行了相关分析、通径分析和灰色关联分析。结果表明,株高与子根数之间达到了显著水平;株高除与茎粗及叶柄长不相关外,与其他性状都有不同程度的相关关系;花枝数几乎与所有地上部分性状都有不同程度的相关性;平均根长、子根数、最大子根质量、子根质量极差均与单株产量有正相关关系。各性状对单株产量直接贡献的大小依次为子根质量极差、最小子根质量、子根数、株高、叶长、茎粗、平均根粗、鲜叶数、平均根长、叶柄长、花枝数、总叶数、叶宽、花穗长、叶柄宽、最大子根质量。灰色关联分析结果表明,关联系数在0.950 0及其以上的株系有40个,涵盖了所研究株系的大多数;公顷产量在22.5 t以上的有11个株系。研究结果可为附子新品种选育提供一定的理论依据。     

大豆—花菜—莴笋一年三熟高效栽培模式

湖北天门总结了大豆—花菜—莴笋一年三熟高效栽培模式,提高了土地利用率、产出率,改变了单种作物多茬导致的连作障碍,而且增加了农户收入,提高了种植蔬菜的积极性。各蔬菜种植时均应选择合适的品种、合理播种、注重病虫害防治等。     

一起肉雏鸡传染性法氏囊病并发大肠杆菌病的诊治

2010年6月，哈尔滨市方正县会发乡某鸡场发生一起肉雏鸡传染性法氏囊并发大肠杆菌病例。依据流行病学，临床症状，剖检变化及实验室检验综合诊断与防治，现将诊疗过程叙述如下。 1 发病情况2010年6月，哈尔滨市方正县会发乡某养鸡场共同养肉雏鸡3000余只，至发病送检时26日龄。肉雏鸡发生以排白色、浅绿色稀粪，羽毛蓬松、精神萎靡不振，颈部、躯干震颤，步态不稳，头下垂，眼睑闭合、脱水，眼窝凹陷，衰弱死亡为特征的传染性疾病。     

Effects of Lactic Acid Bacteria and Fructooligosaccharides on Growth Performance,Nutrient Digestibility and Serum Biochemical Indices of Arctic Foxes (Alopex lagopus) during Early Growth Period北大核心CSCD

This experiment was conducted to study the effects of dietary lactic acid bacteria (LAB) and fructooligosaccharides (FOS) on growth performance, nutrient digestibility and serum biochemical indices of Arctic foxes (Alopex lagopus) during early growth period. Sixty male post-litter Arctic foxes with the average body weight of (1.16±0.15) kg and at the age of (45±3) days were randomly assigned to 4 groups with 3 replicates per group and 5 foxes per replicate. The foxes were fed the following diets, respectively: basal diet (control group), basal diet+3×109 CFU / kg LAB (LAB group), basal diet+5 g / kg FOS (FOS group) and basal diet+3×109 CFU / kg LAB+5 g / kg FOS (LAB+FOS group). The experiment lasted for 30 days. The results showed as follows: 1) on the days 1 to 15, the diarrhea rate of foxes in the LAB group and LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05). On the days 16 to 30, the average daily gain of foxes in the LAB+FOS group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); the diarrhea rate of foxes in the LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); compared with the FOS group, the feed to gain ratio of foxes in the LAB+FOS group was significantly decreased (P<0.05). 2) The dry matter digestibility of foxes in the LAB + FOS group was significantly higher than that in the control group and FOS group (P < 0.05), but had no significant difference with LAB group (P>0.05). There were no significant differences in nitrogen intake, fecal nitrogen, urine nitrogen, nitrogen deposition, net protein utilization and protein biological value among all groups (P>0.05). 3) Serum total protein (TP) content of foxes in the LAB+FOS group was significantly higher than that in the FOS group (P<0.05), but had no significant difference with control group and LAB group (P>0.05). Serum albumin (ALB) content of foxes in the LAB group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB+ FOS group (P>0.05). Serum urea nitrogen (UN) content of foxes in the LAB+FOS group was significantly decreased compared with the control group (P < 0. 05). In conclusion, the combined supplementation of 3 × 109 CFU / kg LAB and 5 g / kg FOS in the diet is beneficial to reduce diarrhea rate, improve dry matter digestibility, improve body immune level, and promote the growth of Arctic foxes during early growth period. © 2023 Chinese Journal of Urology. All rights reserved.     

浅析柴油机中有关油耗、排放控制技术的几个问题

近年来,随着人们对环境的保护日趋重视。特别是近些年来随着城市的汽车越来越多,我国大部分地区被雾霾天气笼罩。研究表明,雾霾天气形成主要原因之一是汽车尾气的排放。因此现在世界各国对内燃机废气排放的要求及标准也越来越高了。     

多浪羊同期发情、定时输精效果探讨

运用阴道海绵栓＋PMSG法对夏季多浪羊进行同期发情处理,并用萨福克羊颗粒冻精对同期发情羊进行定时输精。结果表明：颗粒冻精输精受胎率24.52%,颗粒冻精干、湿两种解冻法对受胎率没有显著影响。     

兴宁地区水稻三化螟大发生原因浅析及其防控对策

针对兴宁市2013年第四代三化螟大发生的情况,进行了系统调查,剖析其大发生的主要原因,提出了"狠抓一、三代压虫源、重视二、四代保丰收"等防控对策。     

遵义朝天椒新品种遵辣8号的选育

介绍了遵义朝天椒新品种遵辣8号的育种目标、选育过程及其特征特性和栽培技术要点.