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1.
在海拔2530 m的南方冷凉山区退耕地上对18个牧草品种进行了引种试验。通过对各牧草的物候期、绝对生长率、相对生长率、茎叶比、产草量、青干比、净同化率等生产性状和经济指标的分析表明:18个牧草品种中15个品种能在冷凉山区正常生长,其中多年生黑麦草(马达)、多花黑麦草(旺饲)、紫花苜蓿(WL-612)和紫花苜蓿(四季旺)、白三叶(海法)各性状表现优良,可作为冷凉山区退耕还草的推广草种(品种)。 相似文献
2.
在云南巍山县,对引进的18个冬春牧草品种及3个混播组合进行了两年的观测.结果表明:冬春优良的禾本科牧草品种有杰威多花黑麦草、钻石T多花黑麦草、特高多花黑麦草;优良的豆科牧草品种有盛世紫花苜蓿、三得利紫花苜蓿和牧歌401+Z紫花苜蓿,优良的混播组合为盛世紫花苜蓿+特高多花黑麦草. 相似文献
3.
应用灰色关联度分析法对14个云南省北亚热带冬闲田引种的优良牧草进行了分析与综合评价。结果表明,在云南省北亚热带地区冬闲田引种优良牧草试验中综合性状表现最好的牧草是兰天堂多花黑麦草、海湾多花黑麦草和盛世紫花苜蓿。其次为特高多花黑麦草、游客紫花苜蓿、猎人河紫花苜蓿、邦德多花黑麦草、赛特紫花苜蓿。而牧杰多花黑麦草、劲能多花黑麦草、光叶紫花苕、泰德多花黑麦草、百慕大多花黑麦草和绿浪高黑麦的加权关联度最小,综合性状最差。 相似文献
4.
2008年在巍山县南诏镇鸡碧村委会小后厂村,对18个冬春季节生长的牧草品种和3个冬春季节生长的混播牧草组合进行了试验。通过对茎叶比、豆禾比、干物质产量测定,结果表明:多花黑麦草品种中杰威多花黑麦草表现最好,其次为钻石T多花黑麦草;豆科牧草中盛世紫花苜蓿表现最好;混播组合中M1=盛世紫花苜蓿+特高多花黑麦草表现最好;适合我县冬春季节推广种植。 相似文献
5.
在云南干热河谷地区退耕地上对12个牧草品种进行了引种试验,通过对各牧草的物候期、产草量、青干比、盖度等生产性状和经济指标的分析表明:非洲狗尾草、臂形草、大翼豆3个品种的各经济性状表现优良,能在云南干热河谷地区正常生长,可作为云南干热河谷地区退耕还草的推广草种(品种)。 相似文献
6.
根据威宁县人工草地建植及种草治理石漠化对优良牧草的要求,对收集和引进的20份草种的物候期、分蘖(分枝)能力、鲜草产量等主要性状进行了综合测定.结果表明:在参试的草种中,适应威宁县种植的多年生禾本科牧草品种有前进、普瑞纳、凤凰多年生黑麦草及鸭茅;一年生禾本科牧草有泰得、杰威、百盛多花黑麦草;豆科牧草有维多利亚紫花苜蓿、佛... 相似文献
7.
在云南干热河谷地区退耕地上对12个牧草品种进行了引种试验,通过对各牧草的物候期、产草量、青干比、盖度等生产性状和经济指标的分析表明非洲狗尾草、臂形草、大翼豆3个品种的各经济性状表现优良,能在云南干热河谷地区正常生长,可作为云南干热河谷地区退耕还草的推广草种(品种). 相似文献
8.
2001～2002年在塔里木河中下游对15种(或品种)引种牧草进行适应性选择种植。以生态适应性、生长发育状况、生物产量为主要指标,筛选适于该地区退耕还草的牧草种类,结果表明:苏丹草、甜高粱、多年生黑麦草、鸡脚草、无芒雀麦、披碱草、沙打旺、阿尔冈金紫花苜蓿表现良好,适宜种植,其余7种牧草表现出不同程度的不适宜性。 相似文献
9.
2001～2002年在塔里木河中下游对15种(或品种)引种牧草进行适应性选择种植。以生态适应性、生长发育状况、生物产量为主要指标，筛选适于该地区退耕还草的牧草种类，结果表明：苏丹草、甜高粱、多年生黑麦草、鸡脚草、无芒雀麦、披碱草、沙打旺、阿尔冈金紫花苜蓿表现良好，适宜种植，其余7种牧草表现出不同程度的不适宜性。 相似文献
10.
以紫花苜蓿(Medicago sativa)为供体植物,采用室内生物学测定法,研究不同浓度(0、2.5、5.0、10.0和20.0g·L -1)紫花苜蓿根浸提液对多年生黑麦草(Lolium perenne)、一年生黑麦草(L. multiflorum)和梯牧草(Phleum pratense)3种禾本科牧草种子萌发过程的化感作用,为探索合理的牧草混播方式提供理论依据。结果表明：在供试浓度范围内,不同浓度的紫花苜蓿根浸提液对3种禾本科牧草种子发芽率、发芽势、发芽指数、活力指数均有明显的抑制作用[化感效应指数(RI)<0],对根长和苗高有低浓度促进、高浓度抑制的作用。3种禾本科牧草对紫花苜蓿化感作用的相应有一定差异,在根浸提液的作用下,多年生黑麦草和一年生黑麦草的化感综合效应指数均为负值,表现为明显的抑制作用[化感综合效应指数(SE)<0];而梯牧草种子萌发生长呈低浓度促进、高浓度抑制趋势。研究结果表明,相较于多年生黑麦草和一年生黑麦草,梯牧草对紫花苜蓿化感抑制作用的适应性和抵抗能力更强,更适合与紫花苜蓿混播。 相似文献
11.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
12.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
13.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
15.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
16.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
17.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
18.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
20.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
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