Journal of Agricultural Science
SCOPUS (1898,1905-2023)SCIE-ISI
0021-8596
1469-5146
Anh Quốc
Cơ quản chủ quản: CAMBRIDGE UNIV PRESS , Cambridge University Press
Lĩnh vực:
Animal Science and ZoologyAgronomy and Crop ScienceGenetics
Các bài báo tiêu biểu
The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passageSummary A method is proposed for estimating the percentage of dietary protein that is degraded by microbial action in the rumen when protein supplement is added to a specified ration. The potential degradability, p , is measured by incubating the supplement in artificial-fibre bags in the rumen and is related to incubation time, ... hiện toàn bộ
Tập 92 Số 2 - Trang 499-503 - 1979
Crop losses to pestsProductivity of crops grown for human consumption is at risk due to the incidence of pests, especially weeds, pathogens and animal pests. Crop losses due to these harmful organisms can be substantial and may be prevented, or reduced, by crop protection measures. An overview is given on different types of crop losses as well as on various methods of pest control developed during the last ce... ... hiện toàn bộ
Tập 144 Số 1 - Trang 31-43 - 2006
The determination of chromic oxide in faeces samples by atomic absorption spectrophotometryA rapid and accurate atomic absorption method for the determination of chromium in faeces samples from pasture experiments using chromic oxide ‘markers’ is described. Of the elements present after ashing and digesting the samples in a phosphoric acid—manganese sulphate—potassium bromate solution silicate, aluminium, calcium and magnesium were found to interfere in the determination. The ef... ... hiện toàn bộ
Tập 59 Số 3 - Trang 381-385 - 1962
The estimation of the digestibility and metabolizable energy content of ruminant feedingstuffs from the gas production when they are incubated with rumen liquor in vitroSUMMARY A rapid method for measuring gas production during incubation of feedingstuffs with rumen liquor in vitro is described. Gas production in 24 h from 200 mg feed dry matter was well correlated with digestibility of organic matter, determined in vivo with sheep. Multiple regression analysis, when it included... ... hiện toàn bộ
Tập 93 Số 1 - Trang 217-222 - 1979
Determination of nitrogen in soil by the Kjeldahl method1. The reliability of the Kjeldahl method for the determination of nitrogen in soils has been investigated using a range of soils containing from 0·03 to 2·7% nitrogen. 2. The same result was obtained when soil was analysed by a variety of Kjeldahl procedures which included methods known to recover various forms of nitrogen not determined by Kjeldahl procedures commonly emp... ... hiện toàn bộ
Tập 55 Số 1 - Trang 11-33 - 1960
Number of kernels in wheat crops and the influence of solar radiation and temperatureSUMMARY The number of kernels per m2 (K ) in well managed and watered wheat crops was studied using results of experiments in Mexico and Australia in which short spring wheat cultivars were subjected to independent variation in radiation, largely via artificial shading, and in temperature. Also crops subjected to differ... ... hiện toàn bộ
Tập 105 Số 2 - Trang 447-461 - 1985
A revised model for the estimation of protein degradability in the rumenEstimates of the degradability of protein in the rumen are essential for the application of new systems which have been suggested for the evaluation of the protein requirements of ruminants (Agricultural Research Council, 1980). The effective percentage degradability (P ) of protein supplements in the rumen is dependent not only on the course of degradation of the... ... hiện toàn bộ
Tập 96 Số 1 - Trang 251-252 - 1981
Perception of and adaptation to climate change by farmers in the Nile basin of EthiopiaSUMMARY The present study employed the Heckman sample selection model to analyse the two- step process of adaptation to climate change, which initially requires farmers' perception that climate is changing prior to responding to changes through adaptation. Farmers' perception of climate change was significantly related to the age of the head of the household, wealth... ... hiện toàn bộ
Tập 149 Số 1 - Trang 23-31 - 2011
The analysis of crop cultivar breeding and evaluation trials: an overview of current mixed model approachesThe analysis of series of crop variety trials has a long history with the earliest approaches being based on ANOVA methods. Kempton (1984) discussed the inadequacies of this approach, summarized the alternatives available at that time and noted that all of these approaches could be classified as multiplicative models. Recently, mixed model approaches have become popular for the analysis of... ... hiện toàn bộ
Tập 143 Số 6 - Trang 449-462 - 2005
Radiation absorption, growth and yield of cerealsSummary Analysis of measurements of absorbed radiation and leaf area indices of wheat and barley crops showed that throughout most of growth the fraction of absorbed solar radiation could be described by a simple exponential equation. For several of these crops grown under a wide range of weather and husbandry at Sutton Bonington and Rothamsted, 2-we... ... hiện toàn bộ
Tập 91 Số 1 - Trang 47-60 - 1978