全文获取类型
收费全文 | 123篇 |
免费 | 1篇 |
专业分类
林业 | 9篇 |
农学 | 34篇 |
基础科学 | 2篇 |
18篇 | |
综合类 | 7篇 |
农作物 | 4篇 |
水产渔业 | 9篇 |
畜牧兽医 | 10篇 |
园艺 | 5篇 |
植物保护 | 26篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 10篇 |
2011年 | 8篇 |
2010年 | 1篇 |
2009年 | 7篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 2篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1970年 | 2篇 |
1967年 | 2篇 |
1959年 | 1篇 |
排序方式: 共有124条查询结果,搜索用时 15 毫秒
71.
Paul PA Lipps PE De Wolf E Shaner G Buechley G Adhikari T Ali S Stein J Osborne L Madden LV 《Phytopathology》2007,97(12):1608-1624
ABSTRACT In an effort to characterize the association between weather variables and inoculum of Gibberella zeae in wheat canopies, spikes were sampled and assayed for pathogen propagules from plots established in Indiana, North Dakota, Ohio, Pennsylvania, South Dakota, and Manitoba between 1999 and 2005. Inoculum abundance was quantified as the daily number of colony forming units per spike (CFU/spike). A total of 49 individual weather variables for 24-h periods were generated from measurements of ambient weather data. Polynomial distributed lag regression analysis, followed by linear mixed model analysis, was used to (i) identify weather variables significantly related to log-transformed CFU/spike (the response variable; Y), (ii) determine the time window (i.e., lag length) over which each weather variable affected Y, (iii) determine the form of the relationship between each weather variable and Y (defined in terms of the polynomial degree for the relationship between the parameter weights for the weather variables and the time lag involved), and (iv) account for location-specific effects and random effects of years within locations on the response variable. Both location and year within location affected the magnitude of Y, but there was no consistent trend in Y over time. Y on each day was significantly and simultaneously related to weather variables on the day of sampling and on the 8 days prior to sampling (giving a 9-day time window). The structural relationship corresponded to polynomial degrees of 0, 1, or 2, generally showing a smooth change in the parameter weights and time lag. Moisture- (e.g., relative humidity-) related variables had the strongest relationship with Y, but air temperature- and rainfall-related variables also significantly affected Y. The overall marginal effect of each weather variable on Y was positive. Thus, local weather conditions can be utilized to improve estimates of spore density on wheat spikes around the time of flowering. 相似文献
72.
73.
Sipra Mohapatra Tapas Chakraborty Ashisa Kumar Prusty Kurucheti Pani Prasad Kedar Nath Mohanta 《Journal of the World Aquaculture Society》2014,45(5):532-544
A study was conducted to determine the immunomodulatory effect of probiotic mixture on the nonspecific immune response and disease resistance of Labeo rohita. Fish were fed with six different test diets with or without probiotics, namely, T1 (basal feed [BF] without probiotics), T2 (BF + Bacillus subtilis [BS] + Lactococcus lactis [LL]), T3 (BF + LL + Saccharomyces cerevisiae [SC]), T4 (BF + BS + SC), T5 (BF + BS + LL + SC), and T6 (BF + heat‐killed bacteria of BS + LL + SC). During the prechallenge period, significantly higher (P < 0.01) nitroblue tetrazolium assay (NBT), red blood cells (RBC), hemoglobin (Hb), globulin, and albumin content were recorded in the probiotic‐supplemented diet group. Feeding all the three probiotics significantly decreased (P < 0.01) the serum aspartate aminotransferases (AST), alanine aminotransferases (ALT), acid phosphatase (ACP), and alkaline phosphatase (ALP) activity and increased the myeloperoxidase (MPO) and immunoglobulin M (IgM) value. Significant difference in the NBT, Hb, serum albumin, and MPO was noticed in both prechallenged and postchallenged fish. Lowest survivability was recorded in the nonprobiotic fed group, followed by the group fed with heat‐killed probiotics, whereas the highest survivability was noticed in the group fed with all the three probiotics in live form. Thus, a probiotic mixture diet constituting of three probiotics in viable form is found to be optimum to enhance the immunity and postinfection survivability in L. rohita fingerlings. 相似文献
74.
Shaheen Praveen Tapan Adhikari Muneshwar Singh A. K. Patra R. N. Singh 《Communications in Soil Science and Plant Analysis》2020,51(13):1811-1825
ABSTRACT Glauconite is a potassium (K) bearing mineral, which generally contains 6–10% K2O and mostly available in various natural deposits in India. Glauconite mineral was converted to nano-particle form by grinding in a high-energy ball mill. The release of K from glauconite nano-particle in soil was studied in a pot culture experiment. Five different treatments viz., 0 mg K2O kg?1, 100 mg K2O kg?1, 150 mg K2O kg?1, 200 mg K2O kg?1 used glauconite nano-particle (GNP) as a K source and 100 mg K2O kg?1 from muriate of potash (MOP), were applied in soil to grow maize (Zea mays L.) plant. The highest K+ concentration was observed in shoot at the application of 200 mg K2O kg?1 through GNP and recorded 2 times more K+ concentration in shoots as compared to 0 mg K2O kg?1 treatment whereas 1.1 times more than the MOP treated soil at 5th harvesting stage. Selected plant physiological parameters namely electrical conductivity of plant cell, height, leaf area and nitrate reductase activity were also recorded maximum at 200 mg K2O kg?1 GNP treated soil. Overall, glauconite nano-particle could supply K throughout the growth period and enhanced biomass yield of maize plant without showing any K deficiency symptom. 相似文献
75.
Effect of nickel sulphate at the sublethal dose of 64 ppm (0.8 of LC50 96 hr) on the blood glucose levels of the freshwater fish, Colisa fasciatus, has been estimated from 3 to 96 hr. The blood glucose level exhibits a steady increase due to Ni toxicity. A maximum increase of 85.08% is observed at 96 hr (P < 0.001). It is suggested that the hyperglycemia in C. fasciatus, caused by exposure to nickel sulphate, is possibly a reflection of stress-induced hormone mediated response. It appears that the blood glucose level is a reliable indicator of Ni toxicity to fish. 相似文献
76.
77.
L. Krishnamurthy Rachid Serraj Kedar Nath Rai C. Tom Hash Abdullah J. Dakheel 《Euphytica》2007,158(1-2):179-188
Crop tolerance to salinity is of high importance due to the extent and the constant increase in salt-affected areas in arid
and semi-arid regions. Pearl millet (Pennistum glaucum), generally considered as fairly tolerant to salinity, could be an alternative crop option for salt affected areas. To explore
the genotypic variability of vegetative-stage salinity tolerance, 100 pearl millet lines from ICRISAT breeding programs were
first screened in a pot culture containing Alfisol with 250 mM NaCl solution as basal application. Subsequently, 31 lines
including many parents of commercial hybrids, selected from the first trial were re-tested for confirmation of the initial
salinity responses. Substantial variation for salinity tolerance was found on the basis of shoot biomass ratio (shoot biomass
under salinity/ non-saline control) and 22 lines with a wide range of tolerance varying from highly tolerant to sensitive
entries were identified. The performance of the genotypes was largely consistent across experiments. In a separate seed germination
and seedling growth study, the seed germination was found to be adversely affected (more than 70% decrease) in more than half
of the genotypes with 250 mM concentration of NaCl. The root growth ratio (root growth under salinity/control) as well as
shoot growth ratio was measured at 6 DAS and this did not reflect the whole plant performance at 39 DAS. In general, the whole
plant salinity tolerance was associated with reduced shoot N content, increased K+ and Na+ contents. The K+/Na+ and Ca++/Na+ ratios were also positively related to the tolerance but not as closely as the Na+ content. Therefore, it is concluded that a large scope exists for improving salt tolerance in pearl millet and that shoot
Na+ concentration could be considered as a potential non-destructive selection criterion for vegetative-stage screening. The
usefulness of this criterion for salinity response with respect to grain and stover yield remains to be investigated. 相似文献
78.
The genetic control of highly restricted branching in narrow-leafed lupin (Lupinus angustifolius L.)
Most current cultivars of narrow-leafed lupin have an indeterminate growth habit such that vegetative growth continues while
the pods are being filled, causing strong intra-plant competition for assimilates. Restricted-branching (RB) genotypes can
reduce this tendency and raise the proportion of the plant's biomass going into grain. Studies on the inheritance of the RB
trait showed that two spontaneous mutants, P25598 and P21227, each carried a single incompletely dominant allele conferring
the trait, whereas two other spontaneous mutants, P24743 and P25582, and two induced mutants, P26021 and P21238, each carried
a single recessive allele conferring the trait. The RB alleles present in P26021 and P21238 seem to be the same, and to be
at the same locus as (or tightly linked to) the allele controlling the RB trait in P21227. Similarly, the genes present in
P21227 and the induced mutant P25735 appear to be the same when these lines are crossed. However, they do not behave the same
in crosses with P26021: thus we propose that there are at least three alleles at the same locus (or at tightly linked loci)
that confer RB. Normal-branching plants that are heterozygous at an RB locus generally have fewer leaves on the uppermost
branch than homozygous-normal plants. Similarly, RB plants that are heterozygous generally have fewer branchless nodes on
the main stem than homozygous-RB plants. The RB trait is associated with a small but significant reduction in the number of
leaves on the main stem. However, this relationship is weak and will not prevent plant breeders from selecting both early-
and late-flowering RB genotypes.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
79.
Mode of inheritance of Alcobaca,a tomato fruit-ripening mutant 总被引:3,自引:0,他引:3
Summary
Alcobaca, an abnormally ripening tomato mutant, was crossed with the normal cultivar Rutgers. Examination of F1, F2 and BC1 populations indicated that a single recessive gene controls the mutant phenotype. No maternal effect was detected. 相似文献
80.
B. N. Mahto S. Gurung Tika B. Adhikari 《European journal of plant pathology / European Foundation for Plant Pathology》2011,131(2):249-260
Fungal leaf spot diseases of wheat (Triticum aestivum L.) in Nepal cause significant yield reduction. Although field testing has identified a few partially resistant cultivars,
most wheat grown in Nepal lacks adequate resistance to leaf spot diseases. During 2009–2010, 116 local and commercial spring
wheat cultivars and advanced breeding lines were selected from multi-year field experiments in Nepal and evaluated for seedling
resistance to three leaf spot diseases: spot blotch, Stagonospora nodorum blotch (SNB) and tan spot races 1 and 5 (two of the most prevalent races) in the growth chambers at North Dakota State University,
Fargo, ND, USA. The wheat cultivars and lines were artificially inoculated with individual pathogens or races at the two-leaf
stage and disease reactions were evaluated 6 to 10 days after inoculation (DAI). Results indicated that 30%, 31%, 19% and
10% of the tested wheat cultivars and lines were resistant to spot blotch, SNB, tan spot races 1 and 5, respectively. Six
advanced breeding lines (SW89-5422, BL 2127 = DANIAL88/HLB30//NL297, BL 3033, FILIN/IRENA/5/CNDO/R143//ENTE/MEXI-2/3/AE. SQUA
(TAUS)/4WEAVER, GAN/AE.SQUARROSA (236)//DOY1/AE.SQUARROSA(447)/3/MAIZ/4/INQALAB91, Mayoor//TK SN1081/Ae. Squarrosa (222)/3/FCT,
were resistant to spot blotch, SNB and tan spot race 1. Similarly, two wheat cultivars Chirya 3 and Chirya 7 were resistant
to spot blotch, and tan spot races 1 and 5. The resistant wheat lines identified in this study represent potentially useful
and untapped sources of resistance to multiple leaf spot diseases and should be utilized in wheat breeding programs in Nepal
in order to develop wheat cultivars with broad-spectrum resistance. 相似文献