全文获取类型
收费全文 | 86981篇 |
免费 | 4839篇 |
国内免费 | 1621篇 |
专业分类
林业 | 4745篇 |
农学 | 4765篇 |
基础科学 | 1643篇 |
10854篇 | |
综合类 | 16115篇 |
农作物 | 3665篇 |
水产渔业 | 3971篇 |
畜牧兽医 | 40475篇 |
园艺 | 1319篇 |
植物保护 | 5889篇 |
出版年
2021年 | 887篇 |
2020年 | 983篇 |
2019年 | 1034篇 |
2018年 | 1317篇 |
2017年 | 1537篇 |
2016年 | 1488篇 |
2015年 | 1472篇 |
2014年 | 1617篇 |
2013年 | 3442篇 |
2012年 | 2759篇 |
2011年 | 3159篇 |
2010年 | 2361篇 |
2009年 | 2328篇 |
2008年 | 3045篇 |
2007年 | 3013篇 |
2006年 | 2750篇 |
2005年 | 2666篇 |
2004年 | 2183篇 |
2003年 | 2403篇 |
2002年 | 2286篇 |
2001年 | 2699篇 |
2000年 | 2568篇 |
1999年 | 2160篇 |
1998年 | 1027篇 |
1997年 | 1049篇 |
1996年 | 900篇 |
1995年 | 1078篇 |
1994年 | 947篇 |
1993年 | 909篇 |
1992年 | 1659篇 |
1991年 | 1748篇 |
1990年 | 1697篇 |
1989年 | 1711篇 |
1988年 | 1571篇 |
1987年 | 1495篇 |
1986年 | 1555篇 |
1985年 | 1464篇 |
1984年 | 1278篇 |
1983年 | 1067篇 |
1979年 | 1173篇 |
1978年 | 887篇 |
1977年 | 840篇 |
1975年 | 829篇 |
1974年 | 1030篇 |
1973年 | 1070篇 |
1972年 | 1018篇 |
1971年 | 951篇 |
1970年 | 927篇 |
1969年 | 899篇 |
1967年 | 844篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Evaluation of Low‐protein Alternative Diets for Pond‐raised Hybrid Catfish,Ictalurus punctatus × Ictalurus furcatus 下载免费PDF全文
Menghe H. Li Edwin H. Robinson Penelope M. Lucas Brian G. Bosworth 《Journal of the World Aquaculture Society》2015,46(2):228-234
A study was conducted to evaluate low‐protein traditional or alternative diets for pond‐raised hybrid catfish, Ictalurus punctatus × Ictalurus furcatus. Three 24% protein diets containing decreasing levels of soybean meal (30, 20, and 15%) and increasing levels of cottonseed meal and corn germ meal were compared with a 28% protein control diet. Hybrid catfish fingerlings (mean initial weight = 71 g/fish) were stocked into 20 earthen ponds (0.04 ha) at a density of 14,826 fish/ha with five ponds per dietary treatment. Fish were fed once daily to apparent satiation for a 191‐d growing season. There were no significant differences in total diet fed, net yield, weight gain, feed conversion ratio (FCR), survival, or fillet proximate nutrient composition among dietary treatments (P ≥ 0.10). However, regression analysis showed for fish fed 24% protein diets there was a linear increase in FCR as soybean meal levels decreased (P = 0.06). Compared with fish fed the 28% protein control diet, fish fed 24% protein diets had lower carcass and fillet yield. Results demonstrate a 24% protein alternative diet containing 20% soybean meal may be substituted for 28% protein diets for hybrid catfish during food fish production. 相似文献
992.
The objective of the work was to evaluate the effect on the nutrient content of replacing fish meal (FM) with blood meal (BM) in fish supplement. Three isonitrogenous diets (35% crude protein) were formulated using FM as the main source of animal protein (BM0); 50% replacement of FM with blood meal (BM50); or 100% replacement of FM with BM (BM100). The chemical composition (ash, crude protein, crude fat and crude fibre) and amino acid composition were determined. Replacement of FM with BM did not affect the proximate composition of the diet apart from ash content which decreased with the level of substitution. Substituting fish meal with blood meal reduced the levels of methionine, lysine, isoleucine, leucine, proline, valine and increased the levels of arginine, phenylanine and alanine in the diet. Amino acid indices revealed that BM0 had more amino acids with the highest chemical scores followed by BM50 and BM100. In all the diets, methionine was the most limiting amino acid. The essential amino acid index of the diets reduced with the level of replacement of FM (0.94, 0.88 and 0.77). The study showed substitution of up to 50% FM with BM gave a useful protein diet and 100% gave almost a poor protein diet. 相似文献
993.
994.
667m2用15.00%安打SC16mL和3.00%阿维菌素EC100mL处理,对水稻高龄纵卷叶螟杀虫效果最好,其防效在97.00%以上。 相似文献
995.
996.
以郑州市公园绿地、附属绿地中的120个人工植物群落为研究对象,调查其群落结构和物种多样性,利用Margalef丰富度指数、Shannon-Wiener多样性指数、Simpson多样性指数和Pielou均匀度指数对郑州市城市绿地人工群落的物种多样性进行研究,结果表明郑州市城市绿地人工群落的丰富度指数均处于较高水平,植物多样性丰富,其中公园绿地丰富度指数最高,道路附属绿地次之,社区附属绿地最低。 相似文献
997.
998.
999.
Can additional N fertiliser ameliorate the elevated CO2‐induced depression in grain and tissue N concentrations of wheat on a high soil N background? 下载免费PDF全文
M. Tausz R. M. Norton S. Tausz‐Posch M. Löw S. Seneweera G. O'Leary R. Armstrong G. J. Fitzgerald 《Journal of Agronomy and Crop Science》2017,203(6):574-583
Elevated CO2 stimulates crop yields but leads to lower tissue and grain nitrogen concentrations [N], raising concerns about grain quality in cereals. To test whether N fertiliser application above optimum growth requirements can alleviate the decline in tissue [N], wheat was grown in a Free Air CO2 Enrichment facility in a low‐rainfall cropping system on high soil N. Crops were grown with and without addition of 50–60 kg N/ha in 12 growing environments created by supplemental irrigation and two sowing dates over 3 years. Elevated CO2 increased yield and biomass (on average by 25%) and decreased biomass [N] (3%–9%) and grain [N] (5%). Nitrogen uptake was greater (20%) in crops grown under elevated CO2. Additional N supply had no effect on yield and biomass, confirming high soil N. Small increases in [N] with N addition were insufficient to offset declines in grain [N] under elevated CO2. Instead, N application increased the [N] in straw and decreased N harvest index. The results suggest that conventional addition of N does not mitigate grain [N] depression under elevated CO2, and lend support to hypotheses that link decreases in crop [N] with biochemical limitations rather than N supply. 相似文献
1000.
A calibration method of detecting soil water content based on the information-sharing in wireless sensor network 总被引:2,自引:0,他引:2
Rong-biao ZhangJing-jing Guo Lei ZhangYe-cheng Zhang Li-hong WangQi Wang 《Computers and Electronics in Agriculture》2011,76(2):161-168
In agricultural production, there is contradiction between the cost and accuracy of detection during the course of acquiring soil water content (θ) online. This conflict is one of the core issues of automatic water-saving irrigation technology in agriculture. At the same time, capacitive soil moisture sensor (CSMS) has received considerable attention, for it can acquire θ with low cost and high precision, and meet the application requirements of wireless sensor network (WSN). But CSMS is vulnerable to the soil temperature (Ts) and salinity (Ss) in the measurement process. Therefore, this study took EC-5 sensor for example to establish water detection calibration models of soil temperature and salinity for single sensor, using Least Squares Support Vector Machines on MatLAB (LS-SVMlab) as the tool. On this basis, we explored the spatial variability of Ts and Ss, and then a method, which could be used to calibrate the output signals of sensors in multi-point network, was proposed based on the information-sharing (Ts or Ss) technology of WSN. Through laboratory experiment, we effectively reduced the impact of soil temperature and salinity on the single sensor. In example analysis, we investigated the detection precision and costs under different information-sharing radiuses (r). And the results indicated that the method we proposed based on the information-sharing technology of WSN could successfully calibrate the influence of soil temperature and salinity on sensors in multi-point network, and it was an efficacious approach to determine the balance between the calibration accuracy of moisture sensor and the investment of agricultural production. For example, while the calibration precision of soil temperature and salinity is respectively 1%, the costs can be reduced by 30%. 相似文献