长江中下游地区常绿草坪草的栽培

长江中下游地区常绿草坪草首选品种为匍茎剪股颖和细弱剪股颖 ,其次为高羊茅、草地早熟禾。同时 ,明确了要保持草坪草的常绿必须配备高质量的栽培管理措施 ,如夏季降土温 ,生长旺季的合理修剪和肥水的管理等     

不同水质灌溉对冷季型草坪草生长特性的影响

在鄂尔多斯地区,利用再生水、雨水和自来水对草坪草进行等量和等时灌溉,研究不同灌溉水源对草地早熟禾、多年生黑麦草、高羊茅、匍匐翦股颖的地上生物量、光合速率、叶绿素含量、根系活力等的影响,通过灰色关联分析进行综合评价。结果表明,再生水和雨水灌溉对草地早熟禾、多年生黑麦草、高羊茅、匍匐翦股颖的生长具有一定促进作用,测定指标综合评价最优的是再生水灌溉下的高羊茅,其次是雨水灌溉下的草地早熟禾,这两者更适宜在鄂尔多斯地区应用。     

天津滨海区草坪草净光合与蒸腾速率日变化特征

研究晴天条件下4种草坪草在不同供水处理下净光合速率和蒸腾速率的日变化特点。结果表明:草地早熟禾(Poa pratensis)和日本结缕草(Zoysia japonica)的净光合速率日变化曲线为双峰型,而高羊茅(Festuca arundinacea)和匍匐翦股颖(Agrostis stolonifera)为3峰型。草地早熟禾、高羊茅、匍匐翦股颖在供水处理间净光合速率差异极显著,而日本结缕草差异不显著;4种草坪草蒸腾速率的日变化曲线均为双峰型;草地早熟禾、高羊茅在供水处理间蒸腾速率差异极显著,匍匐翦股颖差异显著,日本结缕草差异不显著;草地早熟禾与高羊茅水分条件宜在(70%~55%)W,日本结缕草和匍匐翦股颖以(55%~40%)W为宜。     

5种冷季型草坪草的耐热性研究

通过生化培养箱模拟北京地区的高温高湿环境,对高羊茅（Festuca arundinacea）、多年生黑麦草(Lolium perenne)、匍匐剪股颖（Agrostis stolonifera）、草地早熟禾（Poa pratensis）和粗茎早熟禾(P.trivialis)这5种冷季型草坪草在热胁迫过程中的外观质量指标每株绿叶数、生长高度和生理生化指标叶片相对含水量、叶片相对电导率、叶绿素含量、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、过氧化物酶(POD)活性进行分析。结果表明,在昼夜35 ℃/30 ℃的高温下,随着胁迫时间的延长,5种草坪草叶片相对含水量下降,叶片相对电导率上升。叶片叶绿素含量在高温环境中变化趋势不一致,高羊茅、多年生黑麦草、草地早熟禾的叶绿素含量呈先上升后下降的趋势,而匍匐剪股颖和粗茎早熟禾则呈现出持续下降的趋势。随着高温胁迫时间的延长,5种草坪草的SOD、POD活性呈先上升后下降的变化趋势。CAT活性下降,且随着时间的延长,POD和CAT活性下降的幅度增大。在高温胁迫过程中,5种草坪草每株绿叶数和植株生长高度降低。 通过聚类分析可将5种草坪草大致聚为3个耐热级别：1级（相对耐热）高羊茅;2级（中等耐热）草地早熟禾、多年生黑麦草、匍匐剪股颖;3级（相对敏感）粗茎早熟禾。     

不同遮阴条件下几种草坪草的耐阴性及观赏品质比较

通过观察遮阴条件下供试草坪草外观表现,得出耐阴性为:优美草地早熟禾百思特早熟禾翦股颖高羊茅多年生黑麦草狗牙根白三叶。以6种草坪草为试验材料,在不同遮阴条件下,采用九分制评分标准对其形态指标进行综合评分,对叶绿素含量进行测定,同时,在自然条件下对叶绿素a/b值进行测定比较,得出作为室内微型草坪其观赏品质的优劣顺序:优美草地早熟禾、凌志高羊茅顶峰黑麦草中华结缕草、普通狗牙根海法白三叶,优美草地早熟禾、凌志高羊茅和顶峰黑麦草耐阴性较强,与其他品种的观赏品质呈差异显著水平,适合用于室内微型草坪的建植,而适当的通风透光更有利于提高室内微型草坪的观赏品质。     

植物生长调节剂在草坪草上的化控应用技术

植物生长调节剂是应用于草坪管护的新型产品,其用于草坪化控也是一种新兴技术。文章对草地早熟禾、黑麦草、高羊茅、天堂草、马尼拉草、结缕草、狗牙根、野牛草、匍茎翦股颖、白三叶10种常规草坪草的调节剂应用技术逐一进行了阐述,详细解析了各草坪草植物生长调节剂的应用种类、适宜浓度、应用效果、施用方法和注意事项,为草坪的调节剂化控管护提供了良好的技术指导。     

3种冷季型草坪草对盐胁迫的生理响应

以华北地区常见的3种冷季型草坪草匍匐翦股颖、多年生黑麦草和草地早熟禾为试验材料,每个草种选取了有代表性的2个品种进行NaCl胁迫试验。盐浓度分为0、3、6和9dS/m,经过3周的盐胁迫处理后,通过对细胞膜透性、叶绿素、丙二醛、脯氨酸、以及可溶性蛋白等指标的测定,对草坪草耐盐性进行了综合评判,结果表明,3种冷季型草坪草种的6个品种耐盐性能由强到弱的顺序为:草地早熟禾Midnight草地早熟禾Kenblue匍匐翦股颖A4匍匐翦股颖T1多年生黑麦草Premier多年生黑麦草Accent。     

贵州主要野生草坪草

贵州全省属亚热带气候，充足的水热条件孕育了丰富的植物资源，其中有草坪草资源，它们是匍茎翦股颖、翦股颖、白三叶、地毯草、假俭草、狗牙根、早熟禾、雀稗等。     

草坪工厂生产引种筛选试验研究

3年的试验表明:草地早熟禾、高羊茅、黑麦草、匍匐翦股颖可作为工厂化立体培植草坪的主要草种,多年生黑麦草匹克、首相发芽快可用作草坪工厂化生产的保护草种.经草坪质量综合评定,供试草坪草凌志Ⅱ、巴比松、节水草高羊茅,绿坪B5、绿坪B3、百思特、百胜、巴润草地早熟禾,匹克、首相多年生黑麦草,摄政王匍匐翦股颖均适宜在贵州及其类似地区进行草坪工厂化生产.     

不同遮荫强度对草地早熟禾草坪质量的影响

为研究不同遮荫强度对新建草地早熟禾(Poa pratensis)草坪生长状况的影响,于2009年5月1日-11月6日进行试验,共设计自然光照、轻度遮荫、中度遮荫和重度遮荫4种不同遮荫强度,对干旱胁迫下草地早熟禾的生长速率、草坪质量、草屑重量、叶色值、电导率和地下生物量等形态指标和生理指标进行观察测定。结果表明,在少雨时节中度遮荫的草坪质量较高,多雨时节则轻度遮荫的草坪质量较好;适度遮荫下草坪草的生长正常,叶色较好,电导率较小,草坪质量较高。因此,可以利用适度遮荫,减少夏季高温与干旱对草地早熟禾草坪的伤害,改善草坪质量。     

Effects of breeding season length and calving season on range beef cow productivity

A 5-yr study was conducted beginning in 1983 with 460 cows to evaluate the effects of three breeding seasons (30, 45, and 70 d in length) and two times of spring calving, March (early) and April (late), on cattle production under Nebraska Sandhills range conditions. Criteria evaluated included pregnancy and weaning percentages, calving date and distribution, cow weights and body condition at four intervals, calf birth and weaning weights, and cow productivity. The 30-d breeding season included a 10-d estrus synchronization and AI period; in the other breeding seasons only natural breeding was used. The same sires were used over the entire study period. Percentage of cows pregnant and percentage of calves weaned were lower (P less than .01) for cows bred for 30 d than for cows bred for 45 or 70 d. Average calving dates were similar among the breeding groups within the early and late calving herds. Pregnancy rates from AI were higher (P less than .01) for the cows calving in April (64%) than for the cows calving in March (41%). Cows calving in April lost less weight between precalving and prebreeding and were heavier (P less than .05) at prebreeding time than the cows calving in March. Calf weaning weights were not different (P greater than .10) among any of the breeding season groups or between the two calving herds when calves were weaned at a similar age. Cow productivity (calf weaning weight per breeding female) was highest (P less than .05) for the cows bred for 70 d (186 kg), intermediate for the cows bred for 45 d (172 kg), and lowest for cows bred for 30 d (162 kg).(ABSTRACT TRUNCATED AT 250 WORDS)     

非繁殖季节与繁殖季节绵羊冷冻胚胎移植结果的比较

随着畜牧业的发展,胚胎移植越来越受到人们的重视,胚胎移植工作发展很快,近些年来已经陆续有了大批量的胚胎牛、羊出生,胚胎移植技术已经成为一个成熟的技术,应用于畜牧业生产实践。1材料与方法1.1试验动物 选择具有2个以上正常情期,健康无疾病,繁殖机能正常的东北半细毛羊(4-5岁)160只和50只,分别在5-6月和9-10月2个季节进行胚胎移植对比试验,观察在非繁殖季节和繁殖季节的移植结果的比较。     

季节变换时的通风管理

每年的春季和秋季都是鸡舍或者鸡群通风管理的过渡性季节。很多地方白天的气温可能高达27～28℃或者更高．然而到了夜晚温度经常会下降到10℃以下．这种15～20℃以上的温度波动常常使家禽管理人员感到这样的季节条件要想管理好鸡舍通风确实比较棘手。而且。这样的昼夜温差变化也会在其它季节经常出现，特别是在南方某些地区冬季也经常出现这种现象。     

山区放牧黑山羊干湿季节驱虫效果研究

通过对山区放牧山羊的寄生虫感染情况调查 ,并对在干季和湿季驱虫的效果和驱虫后的增重进行观察研究。结果表明 ,放牧山羊寄生虫感染率为线虫 10 0 % ,吸虫 83 3% ,体外寄生虫 10 0 % ;干季驱虫虫卵转阴率10 0 % ,湿季驱虫虫卵转阴率 80 %。但是 ,湿季驱虫后平均增重 2 5 8kg ,差异极显著 (P <0 0 1) ;干季驱虫后平均增重 0 85kg ,差异显著 (P <0 0 5 ) ,可见湿季驱虫比干季驱虫经济效益更好。     

一季度鱼粉市场疯狂天价为哪般

2010年一季度,鱼粉价格可谓饲料市场的佼佼者,在畜禽价格及多数原料品种平静如水甚至萎靡不振的情况下,国内鱼粉市场一枝独秀,不断刷新历史记录创造天价,究竟原因何在?     

Relationships between nutritive quality and fiber components of cool season and warm season forages: a retrospective study

Feeding trials were conducted with 428 forages in three forage classes (C3 grasses, legumes, C4 grasses) fed ad libitum to sheep and with 170 forages fed to cattle over a 20-yr period. Of this total, 153 forages were fed concurrently to sheep and cattle. Where the same forages were fed, mean dry matter digestibility (DMD) and dry matter intake (DMI) were lower (P less than .01) for sheep than for cattle, with significant effects of forage class. With the main population of forages, the regression of DMI on DMD was positive and curvilinear (P less than .01) for sheep, with no effect of forage class, and positive and linear (P less than .0001) for cattle, with a significant effect of class. For all forages, correlations between DMI and neutral detergent fiber (NDF) concentration were -.57 for sheep and -.41 for cattle; regressions differed (P less than .05) with class and animal species. Correlations of DMD with NDF and acid detergent fiber (ADF) concentrations were -.45 and -.59 (P less than .01), respectively, for sheep, and -.32 and -.39 (P less than .01) for cattle; again, regressions differed significantly with class and animal species. Within forage class, regressions of DMD and DMI on fiber components generally were linear. Intake of NDF (NDFI) was related to NDF percentage for all forages by a quadratic regression, with significant differences due to animal species and forage class. Results indicate that relationships between DMD, DMI and fiber fractions differ between forage classes and animal species, that C4 grasses are consumed at levels higher than would be expected from their DMD and fiber concentrations and that ruminants increase NDFI in response to higher NDF concentrations in the forage.     

重庆市晚熟柑橘种植技术

本文对重庆晚熟柑橘适宜气候要求、主要品种、建园及病虫害防治进行了介绍。     

梅雨季节玉米的挑选与贮存保鲜措施

气象学上定义的梅雨是春夏之交长江中下游地区因受副热带高压外围影响形成的天气现象，它的形成是副热带高压边缘西南暖湿气流与冷空气不断交汇的结果，带来的是阴雨连绵，不见晴天，因此空气会非常潮湿．感觉闷热。梅雨季节也泛指江淮流域和南方地区初夏向盛夏过渡的一段阿雨天气过程.