全文获取类型
| 收费全文 | 57篇 |
| 免费 | 20篇 |
专业分类
| 林业 | 3篇 |
| 4篇 | |
| 综合类 | 9篇 |
| 农作物 | 5篇 |
| 水产渔业 | 4篇 |
| 畜牧兽医 | 52篇 |
出版年
| 2022年 | 1篇 |
| 2021年 | 2篇 |
| 2017年 | 1篇 |
| 2016年 | 1篇 |
| 2015年 | 1篇 |
| 2013年 | 2篇 |
| 2012年 | 2篇 |
| 2011年 | 2篇 |
| 2010年 | 1篇 |
| 2008年 | 2篇 |
| 2007年 | 4篇 |
| 2004年 | 2篇 |
| 2003年 | 2篇 |
| 2002年 | 1篇 |
| 2001年 | 1篇 |
| 2000年 | 3篇 |
| 1999年 | 3篇 |
| 1998年 | 2篇 |
| 1996年 | 1篇 |
| 1993年 | 2篇 |
| 1992年 | 1篇 |
| 1991年 | 2篇 |
| 1990年 | 1篇 |
| 1988年 | 1篇 |
| 1987年 | 2篇 |
| 1986年 | 1篇 |
| 1985年 | 1篇 |
| 1980年 | 3篇 |
| 1978年 | 2篇 |
| 1977年 | 2篇 |
| 1976年 | 2篇 |
| 1975年 | 4篇 |
| 1974年 | 1篇 |
| 1973年 | 2篇 |
| 1972年 | 2篇 |
| 1971年 | 3篇 |
| 1970年 | 3篇 |
| 1969年 | 1篇 |
| 1968年 | 1篇 |
| 1957年 | 1篇 |
| 1955年 | 1篇 |
| 1945年 | 1篇 |
| 1936年 | 1篇 |
| 1905年 | 1篇 |
| 1901年 | 1篇 |
排序方式： 共有77条查询结果，搜索用时 15 毫秒
1.
Martin W. Brunson Richard W. Taylor Bert J. Hoff 《Journal of the World Aquaculture Society》1988,19(1):8-13
Twenty-five domestic rice (Oryza sativa L.) cultivars were evaluated in a simulated rice/crawfish double cropping system in southwest Louisiana during 1983 and 1984. Wide variation was observed among cultivars in parameters believed to be important for maximizing productivity in such a system. Mean maturity ranged from 99 (Labelle) to 118 days (Starbonnet), while height ranged from 76 (Bellemont) to 130 cm (Della, Nato). Significant differences in grain yield response were observed, with yields ranging from 4,101 (Bluebelle) to 6,665 kg/hectare (Newbonnet). Straw dry matter production varied greatly, from 3,831 (Bellemont) to 9,170 kg/hectare (Della), and was positively correlated with plant height (r = 0.64; P = 0.0001). Ratoon biomass production was negatively correlated with both grain yield (r = -0.39; P = 0.0001) and maturity group (r = -0.69; P = 0.0001). Plant senescence at grain maturity also varied greatly and appears to be a factor in post-harvest ratoon capability. Early or very early maturing cultivars with both proven grain production and good ratooning capability appear best suited. Cultivar selection should be based upon individual farm situations and currently employed agronomic practices. 相似文献
2.
3.
4.
5.
During the steady-state period of activity of La Soufriere Volcano in 1979, the mass emissions of sulfur dioxide into the troposphere amounted to a mean value of 339 +/- 126 metric tons per day. This value is similar to the sulfur dioxide emissions of other Central American volcanoes but less than those measured at Mount Etna, an exceptionally strong volcanic source of sulfur dioxide. 相似文献
6.
7.
F H White G L Hoff W J Bigler E Buff 《Journal of the American Veterinary Medical Association》1975,167(7):603-604
Bacteriologic, virologic, and serologic examinations were conducted on 180 urban gray squirrels (Sciurus carolinensis) during a 1-year period in a metropolitan area. Evidence was not found of infections with leptospires, enteric or other bacteria, rickettsial agents, Francisella tularensis, or arthropod-borne viruses. The squirrels were remarkably free of evidence of bacterial or viral infections of importance to man and lower animals. 相似文献
8.
9.
10.
G L Hoff W J Bigler E E Buff E Beck 《Journal of the American Veterinary Medical Association》1978,172(3):351-352
Research and surveillance programs relating to the occurrence and distribution of western equine encephalomyelitis virus in Florida, conducted between 1955 and 1976, suggest that the virus is (1) an endemic arbordae, (2) transmitted in a continuous cycle throughout the year by Culiseta melanura mosquitoes, and (3) restricted to fresh water swamps and waterways in central, north, and northwest Florida. 相似文献