Nutrient Cycling in Agroecosystems
SCOPUS (1996-2025)
1573-0867
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
The long-term effects of manures and fertilisers on soil productivity and quality: a review
Tập 66 Số 2 - Trang 165-180 - 2003
The results from 14 field trials comparing the long-term (20 to 120 years)
effects of fertilisers and manures (farmyard manure, slurry, and green manure)
on crop production and soil properties are reviewed. In total there were 24
paired comparisons of the effects of manure and fertiliser. Some of the trials
also contained a control (no nutrient inputs) treatment. The input of nutrients
as either f...
Emissions of NH3, N2O and CH4 from dairy cows housed in a farmyard manure tying stall (housing, manure storage, manure spreading)
Tập 60 Số 1 - Trang 103-113 - 2001
Emission measurements from dairy cows housed in a tying stall were carried out
with the aim of finding factors that influence the amount of emissions and means
to reduce emissions. All sectors of animal husbandry were investigated. This
enabled calculations of emissions for the whole management system including
housing, storage and spreading of manure. Emissions during aerobic composting
and anaer...
Contribution of livestock excreta to nutrient balances
Tập 66 Số 2 - Trang 119-131 - 2003
Livestock excreta make an important contribution to soil nutrient inputs and in
many developing countries are the only significant input. However, there is
little quantitative information available on excreta, manure production, and
application and this makes it difficult to obtain meaningful soil nutrient
balances. A model has therefore been developed to calculate the excreta produced
and manure ...
Comparing a process-based agro-ecosystem model to the IPCC methodology for developing a national inventory of N2O emissions from arable lands in China
Tập 60 Số 1 - Trang 159-175 - 2001
Nations are now obligated to assess their greenhouse gas emissions under the
protocols of Article 4 of the United Nations Framework Convention on Climate
Change. The IPCC has developed `spreadsheet-format' methodologies for countries
to estimate national greenhouse gas emissions by economic sector. Each activity
has a magnitude and emission rate and their product is summed over all included
activi...
Quantitative dependence of methane emission on soil properties
Tập 64 Số 1 - Trang 157-167 - 2002
To identify the key soil parameters influencing CH4 emission from rice paddies,
an outdoor pot experiment with a total of 18 paddy soils was conducted in
Nanjing Agricultural University during the 2000 rice growing season. The
seasonal average rate of CH4 emission for all 18 soils was 6.42±2.70 mg m−2 h−1,
with a range of 1.96 to 11.06 mg m−2 h−1. Correlation analysis indicated that
the seasonal a...
Amelioration of Al toxicity and P deficiency in acid soils by additions of organic residues: a critical review of the phenomenon and the mechanisms involved
Tập 59 Số 1 - Trang 47-63 - 2001
High rates of lime and fertilizer-P are characteristically required to obtain
high crop yields on highly weathered acid soils. Much of the agriculture in the
southern tropical belt, where acid soils predominate, is carried out by
resource-poor, semi-subsistence farmers who are unable to purchase large
quantities of lime and fertilizer. There are, however, a number of reports that
additions of orga...
Nutrient cycling in organic farms: stall balance of a suckler cow herd and beef bulls
Tập 64 Số 3 - Trang 225-230 - 2002
In organic agriculture, the internal farm nutrient cycle must bequantified to
ensure high system productivity accompanied by environmentallysound production
processes. In contrast to common farm-gate and field balances,budgeting at the
stall level is seldom undertaken. When budgeting mixed farmingsystems, a
substantial lack of nutrients can be detected in the “forageand straw input –
stall – manur...
Modeling Trace Gas Emissions from Agricultural Ecosystems
Tập 58 Số 1 - Trang 259-276 - 2000
A computer simulation model was developed for predicting trace gas emissions
from agricultural ecosystems. The denitrification-decomposition (DNDC) model
consists of two components. The first component, consisting of the soil climate,
crop growth, and decomposition submodels, predicts soil temperature, moisture,
pH, Eh, and substrate concentration profiles based on ecological drivers (e.g.,
climat...
Comparing measured and Expert-N predicted N2O emissions from conventional till and no till corn treatments
Tập 66 Số 2 - Trang 107-118 - 2003
Agricultural soils are a major source of the greenhouse gas nitrous oxide (N2O).
Nitrous oxide emission models can be used to predict the effectiveness of N2O
mitigation strategies; however, these models require rigorous testing before
they can be used with confidence. Expert-N, a modular process based N2O emission
model, was tested to determine its ability at predicting nitrogen (N) cycling in
th...
Measurement of nitrous oxide emissions from two rice-based cropping systems in China
Tập 64 Số 1 - Trang 125-133 - 2002
A field experiment was conducted to investigate the effects of winter management
and N fertilization on N2O emission from a double rice-based cropping system. A
rice field was either cropped with milk vetch (plot V) or left fallow (plot F)
during the winter between rice crops. The milk vetch was incorporated in situ
when the plot was prepared for rice transplanting. Then the plots V and F were
div...