全文获取类型
收费全文 | 113篇 |
免费 | 12篇 |
专业分类
林业 | 6篇 |
农学 | 9篇 |
25篇 | |
综合类 | 3篇 |
农作物 | 3篇 |
水产渔业 | 19篇 |
畜牧兽医 | 53篇 |
园艺 | 1篇 |
植物保护 | 6篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 7篇 |
2017年 | 13篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 5篇 |
2013年 | 2篇 |
2012年 | 12篇 |
2011年 | 11篇 |
2010年 | 3篇 |
2009年 | 6篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有125条查询结果,搜索用时 15 毫秒
121.
de Jesús Pires Carolline Costa Marcones Ferreira Zucchi Maria Imaculada Ferreira-Gomes Regina Lucia Pinheiro José Baldin Viana João Paulo Gomes Bajay Miklos Maximiliano Assunção-Filho José Ribamar de Almeida Lopes Ângela Celis 《Genetic Resources and Crop Evolution》2022,69(3):973-986
Genetic Resources and Crop Evolution - Lima bean (Phaseolus lunatus L.) have high genetic diversity, especially in Brazil, which has been maintained both on farms and in germplasm banks. Knowledge... 相似文献
122.
Gabriel Borges Mundim José Marcelo Soriano Viana Ciro Maia Geísa Pinheiro Paes Rodrigo Oliveira DeLima 《Euphytica》2013,191(2):291-299
Popcorn inbred lines with more efficient nitrogen use are better able to uptake nitrogen from the soil and convert it into higher grain yield, resulting in lower environmental and economic impacts caused by nitrogen fertilization. The objectives of this study were to (i) identify inbred lines superior in nitrogen use (ii) assess the genetic diversity between popcorn inbred lines under high and low N conditions and (iii) investigate the causal effects of several traits in nitrogen use efficiency (NUE). We evaluated 25 popcorn inbred lines under high and low N, and several traits related to NUE and its components were measured. Efficient and inefficient inbred lines under both N levels were identified and can be useful for generating a segregating population for quantitative trait loci mapping. The genetic diversity assessment based on phenotypic traits grouped the inbred lines into four clusters under both N levels, and the efficient inbred lines were grouped together, as were the inefficient lines. The most divergent inbred lines under high N were classified as efficient and intermediate and can be useful to generate a divergent breeding population with a high frequency of favorable genes for NUE. Nitrogen uptake efficiency (NUpE) was considered the most important trait for NUE. To improve the accuracy of selection for NUE, a selection index involving the total root length (TRL), daily growth and NUpE traits under both N levels is recommended, as these traits had high correlations with and direct effects on NUE. 相似文献
123.
Maria Regina Gmach Klaus Kaiser Maurício Roberto Cherubin Carlos Eduardo Pellegrino Cerri Izaias Pinheiro Lisboa Ana Luisa Soares Vasconcelos Marcos Siqueira‐Neto 《Soil Use and Management》2021,37(1):126-137
Global demand for bioenergy increases interest in biomass‐derived fuels, as ethanol from sugarcane straw. However, straw is the main carbon source to soil and its removal reduces C input, affecting active fractions (dissolved organic carbon, DOC) and C storage. To quantify the effects of straw removal on DOC and C stocks, we built lysimeter system using soil (Rhodic Kandiudox) from sugarcane field. We evaluated four soil depths (1, 20, 50 and 100 cm) and four straw removal rates: no removal NR, medium MR, high HR and total TR, leaving 12, 6, 3 and 0 Mg/ha on the soil surface, respectively. After rainfall, drainage water was collected and analysed for DOC content. Soil C stocks were determined after the 17‐month. Total DOC released at 1‐cm depth amounted to 606, 500, 441 and 157 kg/ha in NR, MR, HR and TR, respectively. Net‐DOC suggests straw as the main source of DOC. Most of DOC in NR (50%) was retained within the 1–20 cm layer, resulting in higher C stock (10 Mg/ha) in the topsoil. In HR and MR, DOC retention was higher within 20–50 cm, suggesting differences in DOC composition. DOC in TR was 40% higher at 20 cm than at 1 cm, indicating C losses from topsoil. Low concentrations of DOC were found at 100‐cm depth, but representing 30% in TR. Straw removal for bioenergy production is sustainable, but we should leave at least 3 Mg/ha of straw to ensure DOC production and soil C storage, taking account the DOC contribution to key soil functions. 相似文献
124.
125.
Renal biochemistry variables and ultrasonographic imaging in healthy Squirrel monkeys (Saimiri collinsi) 下载免费PDF全文
Fernanda Luiza de Miranda Lins e Lins Pedro Mayor Ednaldo Silva Filho Aline Amaral Imbeloni Wellington Bandeira da Silva Maria Vivina Barros Monteiro Diana Célia Sousa Nunes‐Pinheiro Frederico Ozanan Barros Monteiro 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2017,46(1):126-131