全文获取类型
收费全文 | 5813篇 |
免费 | 295篇 |
国内免费 | 670篇 |
专业分类
林业 | 659篇 |
农学 | 1012篇 |
基础科学 | 550篇 |
1041篇 | |
综合类 | 1588篇 |
农作物 | 305篇 |
水产渔业 | 218篇 |
畜牧兽医 | 827篇 |
园艺 | 215篇 |
植物保护 | 363篇 |
出版年
2024年 | 18篇 |
2023年 | 104篇 |
2022年 | 167篇 |
2021年 | 272篇 |
2020年 | 233篇 |
2019年 | 238篇 |
2018年 | 144篇 |
2017年 | 230篇 |
2016年 | 233篇 |
2015年 | 302篇 |
2014年 | 267篇 |
2013年 | 343篇 |
2012年 | 353篇 |
2011年 | 410篇 |
2010年 | 353篇 |
2009年 | 310篇 |
2008年 | 376篇 |
2007年 | 303篇 |
2006年 | 327篇 |
2005年 | 276篇 |
2004年 | 154篇 |
2003年 | 99篇 |
2002年 | 75篇 |
2001年 | 87篇 |
2000年 | 118篇 |
1999年 | 146篇 |
1998年 | 120篇 |
1997年 | 114篇 |
1996年 | 86篇 |
1995年 | 72篇 |
1994年 | 81篇 |
1993年 | 68篇 |
1992年 | 56篇 |
1991年 | 53篇 |
1990年 | 30篇 |
1989年 | 28篇 |
1988年 | 28篇 |
1987年 | 25篇 |
1986年 | 15篇 |
1985年 | 7篇 |
1984年 | 13篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1970年 | 6篇 |
1964年 | 2篇 |
1930年 | 2篇 |
1925年 | 2篇 |
1924年 | 2篇 |
排序方式: 共有6778条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
45.
为减少钙果在收获中的机械损伤,对品系为农大5号的钙果果实的3轴尺寸、密度、结实度以及采摘力进行了分析。结果表明:农大5号在采收时期的平均粒径大小呈正态分布;随着果实成熟度的增大,果实的结实度会降低;果实的抗挤压能力具有各向异性,顶部受到的抗压力最大,纵向次之,横向最小;果实成熟前期在受到横向、纵向及顶部压力时,其变异系数分别为27.0%、27.5%和23.9%;随着加载速率的提高,摘果的平均力呈下降趋势,表现为拉力在5 mmmin时最大,15 mmmin时次之,45 mmmin时最小;对农大5号钙果果实的采摘拉力进行回归模型分析,其决定系数为0.995 9。试验结果可为钙果采摘装置的结构参数和工作参数提供试验基础依据。 相似文献
46.
Lihua Ning Guizhen Kan Wenkai Du Shiwei Guo Qing Wang Guozheng Zhang Hao Cheng Deyue Yu 《Breeding Science》2016,66(2):191-203
Tolerance to low-phosphorus soil is a desirable trait in soybean cultivars. Previous quantitative trait locus (QTL) studies for phosphorus-deficiency tolerance were mainly derived from bi-parental segregating populations and few reports from natural population. The objective of this study was to detect QTLs that regulate phosphorus-deficiency tolerance in soybean using association mapping approach. Phosphorus-deficiency tolerance was evaluated according to five traits (plant shoot height, shoot dry weight, phosphorus concentration, phosphorus acquisition efficiency and use efficiency) comprising a conditional phenotype at the seedling stage. Association mapping of the conditional phenotype detected 19 SNPs including 13 SNPs that were significantly associated with the five traits across two years. A novel cluster of SNPs, including three SNPs that consistently showed significant effects over two years, that associated with more than one trait was detected on chromosome 3. All favorable alleles, which were determined based on the mean of conditional phenotypic values of each trait over the two years, could be pyramided into one cultivar through parental cross combination. The best three cross combinations were predicted with the aim of simultaneously improving phosphorus acquisition efficiency and use efficiency. These results will provide a thorough understanding of the genetic basis of phosphorus deficiency tolerance in soybean. 相似文献
47.
建立了气相色谱-串联质谱法(GC-MS/MS)检测柑橘中5种杀螨剂残留分析方法。样品经乙腈提取、氯化钠盐析后,取有机相用Qu EChERS方法净化,利用GC-MS/MS在多反应监测(MRM)模式下进行测定,外标法定量。5种杀螨剂在0.005~0.5mg/L浓度范围内呈现良好的线性关系,相关系数r^2均>0.996,方法定量限为0.005 mg/kg。在0.005、0.01和0.1mg/kg 3种添加水平下,加标回收率为70.6%~111.3%,相对标准偏差(RSD)为1.07%~14.64%。本方法简便、重现性良好,可用于柑橘类水果样品中杀螨剂的日常检测。 相似文献
48.
49.
Xinying Zhang Yajing Wang Guirong Huang Fu Feng Xiaoying Liu Rui Guo Fengxue Gu Xin Hu Ziguang Yang Xiuli Zhong Xurong Mei 《Journal of Agronomy and Crop Science》2020,206(2):161-168
Great understanding of the genotypic difference in diurnal stomatal conductance (gs) pattern and the key determinants of the pattern is important for saving water by adopting cultivars appropriately. Fifteen wheat genotypes were studied under different soil conditions and various meteorological conditions with pot cultivation in rain shelter for two years. Genotype and air humidity were found to be key determinants of diurnal gs pattern. All genotypes under low relative humidity (LRH) and most genotypes under high relative humidity (HRH) displayed a gradual decline pattern from morning through the afternoon. Under moderate relative humidity (MRH), all genotypes present a single-peak curve pattern, but they differed in peak time, which may lead to unreliable gs comparison between genotypes and get ostensible contrasting materials. The stomatal conductance was significantly different among genotypes under LRH and the increased gs magnitude is also significantly different when it was compared between LRH and HRH. The present results provide new thinking for selecting and adopting appropriate cultivars with specific stomata traits for the area with various meteorological conditions. 相似文献
50.