Nitrous oxide emissions following application of residues and fertiliser under zero and conventional tillage Tập 254 Số 2 - Trang 361-370 - 2003
Baggs, E.M., Stevenson, M., Pihlatie, M., Regar, A., Cook, H., Cadisch, G.
Emissions of N2O were measured following combined applications of inorganic N
fertiliser and crop residues to a silt loam soil in S.E. England, UK. Effects of
cultivation technique and residue application on N2O emissions were examined
over 2 years. N2O emissions were increased in the presence of residues and were
further increased where NH4NO3 fertiliser (200 kg N ha−1) was applied. Large
fluxes ... hiện toàn bộ
Soil respiration within riparian buffers and adjacent crop fields Tập 229 Số 1 - Trang 117-124 - 2001
Tufekcioglu, A., Raich, J.W., Isenhart, T.M., Schultz, R.C.
We quantified rates of soil respiration among sites within an agricultural
landscape in central Iowa, USA. The study was conducted in riparian cool-season
grass buffers, in re-established multispecies (switchgrass + poplar) riparian
buffers and in adjacent crop (maize and soybean) fields. The objectives were to
determine the variability in soil respiration among buffer types and crop fields
within... hiện toàn bộ
Manganese and iron interactions on their uptake and distribution in soybean (Glycine max (L.) Merr.) - 1983
Heenan, D. P., Campbell, L. C.
The uptake and distribution of iron and manganese were studied in a
manganese-sensitive soybean cultivar (‘Bragg’) grown over a range of supply
levels of these nutrients in solution culture. At high (90 and 275 μM) manganese
levels, increasing the iron concentration in solution from 2 to 100 μM partially
overcame the effects of manganese toxicity. Interactions between manganese and
iron occurred f... hiện toàn bộ
Determination of chitin in fungi and mycorrhizal roots by an improved HPLC analysis of glucosamine Tập 178 Số 1 - Trang 29-35 - 1996
Ekblad, Alf, Näsholm, Torgny
A method to measure chitin content in fungi and ectomycorrhizal roots with
high-performance liquid chromatography (HPLC) was developed. Measurements of
fluorescence of 9-fluorenylmethylchloroformate (FMOC-CI) derivatives of
glucosamine were made on acid hydrolysates of pure chitin, chitin-root mixtures
and fungal-root mixtures. The method was applied on 5 isolates of
ectomycorrhizal fungi, and ect... hiện toàn bộ
A field study of nitrogen dynamics and spring barley growth as affected by the quality of incorporated residues from white clover and ryegrass Tập 203 Số 1 - Trang 91-101 - 1998
Hauggaard-Nielsen, H., de Neergaard, A., Jensen, L.S., Høgh-Jensen, H., Magid, J.
Four different grass swards were grown on a sandy loam for 3 years, and then
incorporated into the soil through rotovation in the spring. The treatments
differed in the proportion of white clover (Trifolium repens) and ryegrass
(Lolium perenne), both through seeding in pure stand or mixture and through N
fertilization (0 or 150 kg N ha-1 yr-1) for the white clover-ryegrass mixtures.
A control trea... hiện toàn bộ
The capacity of soils to preserve organic C and N by their association with clay and silt particles Tập 191 Số 1 - Trang 77-87 - 1997
Hassink, Jan
Although it has been recognized that the adsorption of organics to clay and silt
particles is an important determinant of the stability of organic matter in
soils, no attempts have been made to quantify the amounts of C and N that can be
preserved in this way in different soils. Our hypothesis is that the amounts of
C and N that can be associated with clay and silt particles is limited. This
study... hiện toàn bộ
Bacterial endophytes in processing carrots (Daucus carota L. var. sativus): their localization, population density, biodiversity and their effects on plant growth Tập 253 Số 2 - Trang 381-390 - 2003
Surette, Monique A., Sturz, Antony V., Lada, Rajasekaran R., Nowak, Jerzy
A survey of endophytic bacteria colonizing roots of processing carrots (Daucus
carota) was performed with two high-yielding cultivars (Carochoice, Red Core
Chantenay) grown at two locations (Canning, Great Village) in Nova Scotia. Most
bacterial endophyte colony-forming units (CFU) were recovered from the carrot
crown tissues (96%) compared to the periderm and metaxylem tissues of carrot
storage t... hiện toàn bộ