The Journal of Agricultural Science (J AGR SCI)

Publisher: Cambridge University Press (CUP)

Journal description

The Journal of Agricultural Science publishes papers concerned with the advance of agriculture and the use of land resources throughout the world. It publishes original scientific work related to strategic and applied studies in all aspects of agricultural science including agronomy; crop physiology crop protection breeding genetics and pathology; soil science; animal nutrition physiology and genetics; and the mathematical and statistical methods used in experimentation and data analysis. The journal also publishes book reviews and invited short reviews of scientific topics of current agricultural relevance.

Current impact factor: 0.65

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 0.653
2013 Impact Factor 2.891
2012 Impact Factor 2.878
2011 Impact Factor 2.041
2010 Impact Factor 1.418
2009 Impact Factor 1.658
2008 Impact Factor 1.471
2007 Impact Factor 1.093
2006 Impact Factor 0.861
2005 Impact Factor 0.636
2004 Impact Factor 0.541
2003 Impact Factor 0.596
2002 Impact Factor 0.463
2001 Impact Factor 0.58
2000 Impact Factor 0.673
1999 Impact Factor 0.743
1998 Impact Factor 0.65
1997 Impact Factor 0.701
1996 Impact Factor 0.619
1995 Impact Factor 0.581
1994 Impact Factor 0.621
1993 Impact Factor 0.457
1992 Impact Factor 0.617

Impact factor over time

Impact factor

Additional details

5-year impact 0.42
Cited half-life 4.00
Immediacy index 0.15
Eigenfactor 0.00
Article influence 0.12
Website Journal of Agricultural Science, The website
Other titles Journal of agricultural science (Online)
ISSN 0021-8596
OCLC 43802228
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Cambridge University Press (CUP)

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Author's Pre-print on author's personal website, departmental website, social media websites, institutional repository, non-commercial subject-based repositories, such as PubMed Central, Europe PMC or arXiv
    • Author's post-print on author's personal website on acceptance of publication
    • Author's post-print on departmental website, institutional repository, non-commercial subject-based repositories, such as PubMed Central, Europe PMC or arXiv, after a 6 months embargo
    • Publisher's version/PDF cannot be used
    • Published abstract may be deposited
    • Pre-print to record acceptance for publication
    • Publisher copyright and source must be acknowledged with set statement
    • Must link to publisher version
    • Publisher last reviewed on 07/10/2014
    • This policy is an exception to the default policies of 'Cambridge University Press (CUP)'
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Phenological development and its variation during reproductive growth have important effects on the yield and quality of forage grasses. In perennial ryegrass ( Lolium perenne L.) genetic variation in heading date is well recognized, but there are no reliable studies about the variability in the length of the stem elongation phase. To determine the variation in phenological traits of single plants of perennial ryegrass genotypes, a field trial was conducted over three growing seasons (2011–2013) using plant material from eight different ecotype populations, sampled from old permanent grassland swards in Northern Germany. In addition to the phenological stages of jointing, heading and flowering, the critical phase of stem elongation was considered as a new phenological trait. It was hypothesized that the length of the critical phase between jointing and heading differs significantly among genotypes and thus offers a new tool for selecting for specific purposes, e.g. adaption to changing climatic conditions, cutting or grazing as well as yield and quality. The study revealed significant genotypic variation in the observed traits, which was highest for the critical phase (GCV = 0·21). Moderate heritability in jointing ( h 2 = 0·72) revealed a large environmental impact. In contrast, high heritability ( h 2 > 0·86) in heading, flowering and the critical phase imply a strong genetic effect. Moderate to high genotypic and phenotypic coefficients of correlation revealed a substantial linkage among the phenological traits. Results are discussed in the context of providing different approaches and strategies in forage crop production, especially with regard to regional weather conditions and future climate change. Significant differences among the tested ecotype populations indicate that existing diversity in permanent grassland can provide source material for further progress in grass breeding.
    The Journal of Agricultural Science 10/2015; DOI:10.1017/S002185961500091X
  • [Show abstract] [Hide abstract]
    ABSTRACT: Nine genotypes, bred for the high input agronomical conditions of Henan Province (China), were tested under the high-yielding Mediterranean conditions of Spain. Two widely grown cultivars in the zone were included as checks. Crop growth and leaf chlorophyll content, leaf stomatal conductance (gs) and canopy temperature (CT) were measured during the crop cycle and stable carbon, oxygen and nitrogen isotope compositions (δ13C, δ18O and δ15N) were analysed on different plant parts. The lower yield of the Chinese genotypes compared with the checks was due to fewer kernels/unit area, associated with lower tillering and a plant height clearly below the optimal range. Moreover, Chinese wheats exhibited a lower spike fertility index than the checks, and this was associated with a less compact spike structure. The physiological characteristics related to better performance under high yielding Mediterranean conditions consisted of a higher green aerial biomass, particularly during the reproductive stage, together with more favourable water conditions (higher gs and lower CT and δ13C), the capacity to take up water during grain filling (higher δ18O) and a more efficient uptake (lower δ15N) and utilization (lower leaf nitrogen and chlorophyll content) of nitrogen fertilizer. It is concluded that Chinese genotypes exhibited a low acclimation capacity to the moderate stress typical of the high-yielding Mediterranean conditions.
    The Journal of Agricultural Science 10/2015; DOI:10.1017/S0021859615000817
  • [Show abstract] [Hide abstract]
    ABSTRACT: Nitrogen (N) supply is essential for achieving high grain yield in maize production, but excessive N application can lead to lodging risks and potential yield loss. The main objective of the present study was to investigate the effect of ethephon application under different N fertilizer rates in reducing maize lodging. Field experiments were conducted to determine the interactive effects of ethephon (0 and 180 g/ha) and N rate (0, 75, 150 and 225 kg N/ha) on the morphological and chemical characteristics of basal internode and yield across two summer maize-growing seasons (2011/12) in Wuqiao of the North China Plain. Findings showed that ethephon significantly increased the maximum diameter of the 7th to 14th internodes, and decreased the internode lengths, which led to a decrease in plant and ear heights under different N rates. Significant ethephon × N interaction effects were observed on the diameter and length of internode, dry weight per unit internode length and breaking resistance. Ethephon significantly increased N, cellulose and hemicellulose contents of the basal internode, but cellulose and hemicellulose contents decreased as the rate of N application increased. Internode diameter, dry weight per unit internode length, and N content of the basal internode were significantly positively correlated with breaking resistance. Ethephon significantly increased grain yield and harvest index in 2011, but not in 2012. Grain yield and above-ground biomass were increased with increasing N application in both growing seasons, showing linear and quadratic responses. These results suggested that ethephon could increase stalk strength by improving the morphological and chemical characteristics of the basal internode, and maintain high yield and biomass under high N rates.
    The Journal of Agricultural Science 09/2015; DOI:10.1017/S0021859615000829
  • [Show abstract] [Hide abstract]
    ABSTRACT: Identifying and applying the optimum fertilizer nitrogen (N) rate is a permanent challenge for farmers. Prediction of fertilizer N requirement, based on crop chlorophyll measurements (CMs), relies on a strong relationship between fertilizer N supply and leaf chlorophyll concentration at a given crop growth stage. A methodological approach is described, aiming to develop an algorithm that uses CM inputs to derive the economically optimum fertilizer N rate for top-dressing, without using a reference plot for data normalization. The method was tested on maize (Zea mays L. cvar Jabali) at experimental and farmer sites in the central (‘Bajío’) region of Mexico over 3 years (2010–12). Increasing fertilizer N supply at planting significantly influenced chlorophyll concentration at the seventh unfolded maize leaf stage (GS 17 on the Zadoks scale). Maize grain yields increased with increasing total fertilizer N supply and fitted quadratic models, which allowed economically optimum fertilizer N rates (Nopt) to be calculated. The Nopt ranged from 160 to 300 kg N/ha and corresponding grain yields ranged from 7·7 to 14 t/ha. Grouped data analysis (sites–years) confirmed a highly significant relationship between the Nopt and the chlorophyll concentration at GS 17, which could be described by a linear model: Nopt = 513·3–0·58 × CM. This model predicted the top-dressing Nopt within a fertilizer N management regime adapted to local maize cropping systems and led to similar grain yields across test sites compared with the same parameters calculated based on grain yield response trials. The current approach is variety-specific, so development of so-called correction factors accounting for variety-related differences in chlorophyll concentration is described. The results demonstrated the feasibility of the proposed algorithms to support decision-making on the optimum fertilizer N rate to apply in maize production systems with one top-dressing application.
    The Journal of Agricultural Science 08/2015; -1. DOI:10.1017/S002185961500074X
  • The Journal of Agricultural Science 08/2015; 7(9). DOI:10.5539/jas.v7n9p1
  • [Show abstract] [Hide abstract]
    ABSTRACT: The effect on performance of adding calcium (Ca)-butyrate and Oleobiotec (a flavouring agent) additives to dairy calf starter diet was investigated. Thirty-two newborn Holstein calves (16 males and 16 females) were used in a completely randomized design with four treatments as: (1) diet with no additives, (2) diet containing Ca-butyrate, (3) diet containing Oleobiotec and (4) diet containing Ca-butyrate plus Oleobiotec. Milk of calves was supplemented with additives in the first 20 days of the study and then additives were top-dressed into the starter. Calcium-butyrate had no effect on starter and alfalfa intake during pre-weaning, post-weaning and over the whole trial period but it significantly increased the average daily gain and feed efficiency of calves during post-weaning and the whole trial period. Adding Oleobiotec did not change calf performance significantly. Furthermore, no synergistic effect of experimental additives on calf performance was observed.
    The Journal of Agricultural Science 08/2015; DOI:10.1017/S0021859615000726
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Understanding the effect of genetic factors controlling flowering time is essential to fine-tune crop development to each target environment and to maximize yield. A set of 35 durum wheat genotypes of spring growth-habit involving different allelic combinations at Ppd-A1 and Ppd-B1 genes was grown for 2 years at four sites at latitudes ranging from 19°N to 41°N. The emergence-flowering period was reduced from north to south. The frequency in the collection of the insensitive allele GS-105 at Ppd-A1 was greater (34%) than that of allele GS-100 (20%). Genotypes that flowered earlier due to the presence of alleles causing photoperiod insensitivity extended their grain-filling period, but less than the shortening in flowering time. The effect of the allele conferring photoperiod sensitivity at Ppd-A1 was stronger than that at Ppd-B1 ( Ppd-A1b > Ppd-B1b ). The effect of photoperiod insensitivity alleles was classified as GS-100 > GS-105 > Ppd-B1a . The phenotypic expression of alleles conferring photoperiod insensitivity at Ppd-A1 increased at sites with average day length from emergence to flowering lower than 12 h. An interaction effect was found between Ppd-A1 and Ppd-B1 . Differences between allelic combinations in flowering time accounted for c . 66% of the variability induced by the genotype effect, with the remaining 34% being explained by genes controlling earliness per se . The shortest flowering time across sites corresponded to the allelic combination GS-100/ Ppd-B1a , which reduced flowering time by 11 days irrespective of the Ppd-A1b/Ppd-B1b combination. The current study marks a further step towards elucidation of the phenotypic expression of genes regulating photoperiod sensitivity and their interaction with the environment.
    The Journal of Agricultural Science 08/2015; -1:1-20. DOI:10.1017/S0021859615000507
  • [Show abstract] [Hide abstract]
    ABSTRACT: Quantitative assessment of mitigation measures for nitrogen (N) pollution requires adequate models, good knowledge of catchment functioning and a thorough understanding of agricultural systems and stakeholder constraints. The current paper analyses a set of results from simulations, with two models, of agricultural changes in two catchments in different contexts with different constraints. The results show that reducing N inputs and increasing grassland areas are the most efficient measures, not only because they reduce N fluxes in streams but also because they enhance N use by agriculture and the whole catchment system. Introducing catch crops, hedgerows and riparian buffers are interesting complementary measures but of limited impact when implemented alone. These results are sensitive to the way mitigation measures are translated into model inputs, and their operational implications are discussed.
    The Journal of Agricultural Science 08/2015; 153(06):1-16. DOI:10.1017/S0021859615000258
  • The Journal of Agricultural Science 08/2015; 153(06):1-2. DOI:10.1017/S0021859615000581
  • [Show abstract] [Hide abstract]
    ABSTRACT: To cope with phosphorus (P) deficiency, plants adapt root morphology to enhance inorganic P (Pi) acquisition from soil by allocating more biomass to roots, but whether the responses can be modified across gradients of P supply is not fully understood. The present study examined changes in root-length density (RLD), root-hair density (RHD) and root-hair length (RHL) of wheat ( Triticum aestivum L.) in two contrasting soils, the Rough and Barnfield soils. Wheat plants were grown for 3 weeks in thin-plate rhizotrons in two soils with additions of 0, 10, 25, 50, 100 and 200 mg P/kg soil. Contrary to published literature, as P additions increased it was observed that a concomitant increase in RHL (250 to 1054 µ m in the Rough soil and 303–1075 µ m in the Barnfield soil) and RHD (57 to 122/mm in the Rough soil and 56–120/mm in the Barnfield soil), while RLD generally decreased (2480–1130 cm/cm 3 in the Rough soil and 1716–865 cm/cm 3 in the Barnfield soil). The levels of added P that resulted in critical P concentrations in the soils enabling maximum shoot biomass production were 50 mg/kg P in the Rough soil and 100 mg/kg P in the Barnfield soil, and these additions influenced root morphological changes. Under severe P deficiency, P supply increased RHL and RHD, but RLD was decreased. Improvement in lateral root and root-hair responses in wheat at extreme P deficiency may be a worthy target for breeding more sustainable genotypes for future agroecosystems.
    The Journal of Agricultural Science 07/2015; DOI:10.1017/S0021859615000702
  • [Show abstract] [Hide abstract]
    ABSTRACT: In agricultural production systems, nitrogen (N) losses to the environment can occur through nitrous oxide (N 2 O) emissions and nitrate (NO 3 − ) leaching. The objectives of the present study were to evaluate: (1) if urine excreted by non-lactating dairy cows pulse-dosed with dicyandiamide (DCD) and applied to lysimeters reduced N 2 O-N emissions and NO 3 − -N leaching on two soil types; and (2) if urine + DCD would increase herbage production over winter. Lysimeters were used to measure N 2 O emissions and NO 3 -N leaching. The soils used were a free-draining acid brown earth of sandy loam to loam texture (termed free-draining) and a poorly drained silt loam gley (termed poorly drained). Grass plots were established on the free-draining soil to measure herbage production. The N loading rate of the urine + DCD was 508 kg N/ha and the urine without DCD (urine only) was 451 kg N/ha. Total NO 3 − -N leaching losses from the free-draining and poorly draining soils were reduced from 100 and 81 kg NO 3 − -N/ha on the urine-only treatment, respectively, to 9 and 11·6 kg NO 3 − -N/ha on the urine + DCD treatment, respectively. Total N 2 O-N emissions from the free-draining and poorly drained soils were reduced significantly from 13·6 and 12·1 kg N 2 O-N/ha on the urine-only treatment, respectively, to 2·23 and 5·24 kg N 2 O-N/ha on the urine + DCD treatment, respectively. Applying urine with DCD to pastures inhibited the nitrification process for up to 56 days after treatment application. In the current experiment, there was no significant effect on spring herbage production when urine + DCD was applied to grass plots. Therefore, feeding DCD to dairy cows to apply DCD directly in urine patches was shown to be an effective mitigation strategy to reduce NO 3 − -N leaching and N 2 O-N emissions but did not appear to increase spring herbage production.
    The Journal of Agricultural Science 07/2015; DOI:10.1017/S0021859615000660