全文获取类型
收费全文 | 1347篇 |
免费 | 55篇 |
国内免费 | 123篇 |
专业分类
林业 | 47篇 |
农学 | 169篇 |
基础科学 | 23篇 |
137篇 | |
综合类 | 531篇 |
农作物 | 130篇 |
水产渔业 | 124篇 |
畜牧兽医 | 79篇 |
园艺 | 262篇 |
植物保护 | 23篇 |
出版年
2024年 | 13篇 |
2023年 | 22篇 |
2022年 | 43篇 |
2021年 | 42篇 |
2020年 | 49篇 |
2019年 | 48篇 |
2018年 | 40篇 |
2017年 | 46篇 |
2016年 | 55篇 |
2015年 | 42篇 |
2014年 | 76篇 |
2013年 | 82篇 |
2012年 | 106篇 |
2011年 | 99篇 |
2010年 | 88篇 |
2009年 | 67篇 |
2008年 | 62篇 |
2007年 | 83篇 |
2006年 | 68篇 |
2005年 | 59篇 |
2004年 | 34篇 |
2003年 | 35篇 |
2002年 | 27篇 |
2001年 | 27篇 |
2000年 | 19篇 |
1999年 | 27篇 |
1998年 | 14篇 |
1997年 | 17篇 |
1996年 | 20篇 |
1995年 | 20篇 |
1994年 | 17篇 |
1993年 | 7篇 |
1992年 | 12篇 |
1991年 | 18篇 |
1990年 | 10篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1976年 | 2篇 |
1962年 | 2篇 |
排序方式: 共有1525条查询结果,搜索用时 15 毫秒
91.
The addition of genistein, a plant-to-bacteria signal molecule, to Bradyrhizobium japonicum cells prior to use as inocula has been shown to increase nodule number and promote soybean N2 fixation at low root zone temperatures. Previous greenhouse and field experiments involving only two cultivars have indicated that soybean [ Glycine max (L.) Merr.] cultivars can vary in their response to genistein application. The objective of this study was to evaluate a range of soybean cultivars for response to genistein application under short-season cool-spring Canadian conditions. A 2-year field study was conducted in 1997 and 1998 with a range of soybean cultivars recommended for Quebec. The 11 cultivars tested represented a range of yield potentials and maturity groups. They were inoculated with genistein-preincubated B. japonicum inocula or regular inocula, applied into the furrow at the time of planting. The results of these experiments indicated that neither maturity nor yield was correlated with increases in nodulation, biomass, and plant total nitrogen content resulting from genistein treatment and that all maturity groups responded to genistein application in essentially the same way. Thus, response of soybean cultivars to genistein addition is regulated by genotype characteristics other than maturity or yield level. 相似文献
92.
The influence of 9 rootstocks (M2, M7, M25, M26, MM104, MM106, MM109, MM111 and seedling) on fruit quality at harvest and after storage of ‘Wellspur Delicious’ (WS) and ‘Goldspur’ (GS), and of 3 rootstocks (M7, M26 and MM106) on fruit quality of ‘Red King Delicious’ (RK) and ‘Golden Delicious’ (GD) apple (Malus domestica Borkh.) was evaluated during a 4-year period. Fruits from trees on M26 were larger, developed earlier color and soluble solids (SS), and maintained higher levels of acidity (at harvest and during storage) in comparison with other rootstocks. Fruit from trees on M2 tended to have high SS. Fruit color from trees on MM104, MM106 and MM109 tended to be comparatively poor. There were significant rootstock effects on SS, starch, acidity, color, circumference, weight and box size. 相似文献
93.
“90 - 1”是从乍娜的芽变中选出的葡萄新品种。多年的研究试验表明 :该品种除保持母本的优质、丰产、适合保护地栽培等优良性状外 ,最突出的特点是极早熟 ,果实 6月下旬成熟 ,果实发育期 35d。果实不易感病 ,不宜用膨大剂处理。 相似文献
94.
The effect of maturity at harvest of whole-crop barley for ensiling on intake and liveweight gain of dairy steers differing in initial live weight (LW) was evaluated in an experiment over two years. Light (104–120 kg) and heavy (402–419 kg) dairy steers were fed diets containing predominantly whole-crop barley silage harvested at the milk stage [dry matter (DM) content of 284 g kg−1 and neutral-detergent fibre (NDF) concentration of 526 g kg−1 DM] or the dough stage of maturity (DM content of 328 g kg−1 and NDF concentration of 445 g kg−1 DM) and supplemented with up to 1 kg of concentrate. Dry matter intake (g kg−1 LW) was higher for whole-crop barley harvested at the dough stage than at the milk stage of maturity and the difference was greater in heavy than in light steers ( P < 0·001). Liveweight gain was higher and feed conversion ratio was lower for dough-stage compared with milk-stage silage ( P < 0·05) but there was no interaction with size of steer. Whole-crop barley harvested at the dough stage of maturity promoted higher liveweight gains in dairy steers compared with whole-crop barley harvested at the milk stage due to a higher DM intake. 相似文献
95.
96.
97.
98.
本文讨论了山东省沂南县沂河林场不同密度Ⅰ-72杨人工林的投入产出及经济成熟龄。投入分为一次性投入和每年投入。一次性的总投入量为2 33 1.00元/ha,其中整地占84%;平均年投入为253.21元/ha·a,其中追肥占74%。文中还计算了长期占用资金的复利。对各密度的年投入量、年生长量、年产值、年均净产值及其年动态进行了研究,同时做了林木的年均生长量和年均净产值数学模拟。杨树人工林在造林后第三年才能获得利润。数量成熟龄为6~10年,年均最高生长量可达25.252 1 m~3/ha·a。经济成熟龄为6~7年,年均最高净产值可达6 110.52元/ha·a。杨树人工林的数量成熟龄与经济成熟龄主要受密度及投入成本的影响。 相似文献
99.
Seed maturity indices of Populus ciliata were investigated in collections from Sukhatal and Bhowali. Across both seed sources, mean capsule size varied from 68.0±1.5 mm2 to 72.0±0.9 mm2, while mean number of capsules/100 grams varied from 268±8 to 295±12. Mean weight of 100 capsules varied from 25.0±1.4 g to 27.0±1.4 g. Weight of 100 capsules among sources and individual trees differed significantly (P < 0.05), while number of capsules/100 grams and weight of 100 capsules was negatively correlated (r2 = 0.69). As capsules matured moisture content decreased from 83.2±1.1% to 54.3±0.3% at Sukhatal and from 77.7±0.4% to 46.4±0.3% at Bhowali. The optimum germination was at 58–60% moisture content. Maturation was related to capsule colour changes as well as moisture content. These parameters were judged to be good indicators of when to collect P. ciliata seeds. 相似文献
100.
In 1991 and 1992 studies on Dalbergia sissoo Roxb. showed the availability of ample amount of viable seed from November to May. Viability of seeds collected from December to March was more than 90 per cent. There was a slight but significant decrease in germination from March to may. Again germination per cent was slightly and significantly decreased from May to July. Thereafter, seed availability and viability were got drastically reduced. Sufficient viable seed of Dalbergia sissoo Roxb. can be collected at any time from November to July. 相似文献