全文获取类型
收费全文 | 550篇 |
免费 | 14篇 |
国内免费 | 23篇 |
专业分类
林业 | 41篇 |
农学 | 40篇 |
基础科学 | 30篇 |
29篇 | |
综合类 | 189篇 |
农作物 | 21篇 |
水产渔业 | 45篇 |
畜牧兽医 | 151篇 |
园艺 | 36篇 |
植物保护 | 5篇 |
出版年
2024年 | 7篇 |
2023年 | 15篇 |
2022年 | 17篇 |
2021年 | 11篇 |
2020年 | 20篇 |
2019年 | 18篇 |
2018年 | 21篇 |
2017年 | 13篇 |
2016年 | 13篇 |
2015年 | 13篇 |
2014年 | 56篇 |
2013年 | 43篇 |
2012年 | 34篇 |
2011年 | 30篇 |
2010年 | 43篇 |
2009年 | 20篇 |
2008年 | 46篇 |
2007年 | 18篇 |
2006年 | 22篇 |
2005年 | 17篇 |
2004年 | 20篇 |
2003年 | 15篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有587条查询结果,搜索用时 15 毫秒
61.
62.
果园介壳虫的防治技术 总被引:1,自引:0,他引:1
在我国危害果树的介壳虫主要有苹果球蚧、梨圆蚧、桑白蚧、朝鲜球坚蚧、日本龟蜡蚧、桃球蜡蚧、桃盔蜡蚧、柿绵蚧、康氏粉蚧、草履蚧等,近年星中度偏重发生,对果树正常生长影响较大。可采取如下措施防治。 相似文献
63.
64.
江苏省沿海滩涂面积广阔,滩涂大面积养鱼已有近二十年的发展历史,围滩养殖具有相当规模,形成了一套比较完整的鲫鱼高产养殖技术。目前主养品种为异育银鲫,现将有关高效养殖模式和饲料配方设计技术要点介绍如下。一、养殖模式1.鱼池基本条件养殖鱼池呈长方形,面积在200~400亩为宜,整个鱼池呈东低西高地势。鱼塘堤、沟和平滩面积比为15:20:65,堤高1.5~2.O米。堤内挖“回”字形沟,沟深1.0~1.5米(与滩面相比),鱼池平均水深1.0~1.8米。围堤要坚固抗风浪,利用圩堤和四周空地种植耐盐高产优质牧草,可保证养殖全程的青饲料供应,还可以利用牧草… 相似文献
65.
66.
67.
68.
江西省遂川县为贯彻中央及省惠农政策,从2006年起开展了林权抵押贷款业务。目前,由于林权抵押贷款业务在遂川县的全面开展,惠及了全县近2000户林农、30余家木竹生产企业、14个民营林场,林农纷纷以森林资源作抵押,变现资金,发展生产,全县已累计办理林权抵押贷款1亿元以上。从近几年的运作来看,林权抵押贷款解决了农村低收人群体贷款难的问题,林权证发挥了最佳抵押品的功能,资金流、技术流、信息流向林农和加工企业集聚,实现了企业、林农与金融的多赢。 相似文献
69.
70.
Longnan City in Gansu Province is the largest base of olive production in China. In the olive orchard locating in Wudu District of Longnan City, thirty trees were sampled each of three cultivars, ‘Leccino’, ‘Chenggu32’, ‘Ezhi8’, with monoconical and vase training system. After planted with density of 5×6 m in 1992, each sample tree was investigated to determine the yield fresh fruit in five different years. The results of survey and analysis showed that there were significant differences of fruit yield among 5 years and 3 cultivars. Different canopy shapes yielded some effect on fruit setting rate and yield of different cultivars in different years. During first fruiting period in the fourth/sixth year after planting, fruit setting rate and yield of ‘Leccino’ with monocone were more 6.7% and 0.15 kg than those with vase and those of ‘Ezhi8’ and ‘Chenggu32’ with vase were more 20%, 10% and 0.18 kg, 0.09 kg than those with monocone. With the increase of tree age, fruit set and yield of ‘Leccino’ and ‘Ezhi8’ with vase was more than those of monocone. In 2011, average yields per tree of ‘Leccino’ and ‘Ezhi8’ with vase were more 13.35 kg and 6.85 kg than those with monocone. And the highest yield per tree of ‘Leccino’ with vase was 75 kg, more 16 kg than that of monocone. Fruit trees with yield over 35 kg of ‘Leccino’ and 25 kg of ‘Ezhi8’ with vase accounted for 80% and 46.7%, more 40% and 30.01% than those of monocone. It was concluded that vase training system would produce higher yield of ‘Leccino’ and ‘Ezhi8’ and its effect and advantages were gradually prominent with increase age. As for ‘Chenggu32’, monocone got a slightly higher yield than that of vase and in 2011 fruit trees with yield over 15 kg accounted for 25%, more 8.34% than vase. The difference between two training system of this cultivar was not obvious. 相似文献