Biology and Fertility of Soils
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Effect of P stoichiometry on the abundance of nitrogen-cycle genes in phosphorus-limited paddy soil
Biology and Fertility of Soils - Tập 53 - Trang 767-776 - 2017
Previous studies have shown that phosphorus addition to P-limited soils
increases gaseous N loss. A possible explanation for this phenomenon is element
stoichiometry (specifically of C:N:P) modifying linked nutrient cycling, leading
to enhanced nitrification and denitrification. In this study, we investigated
how P stoichiometry influenced the dynamics of soil N-cycle functional genes.
Rice seedli...
Competition between effective and less effective strains of Bradyrhizobium spp. for nodulation on Vigna radiata
Biology and Fertility of Soils - Tập 33 - Trang 382-386 - 2001
Local and exotic cowpea bradyrhizobial strains were examined for their
effectiveness and competitive ability on the cultivated Vigna radiata (mungbean)
variety NM-51. The seven most efficient N2-fixing strains were then evaluated
for their competitiveness against two less effective strains in a pair-wise
inoculation experiment. Nodule occupancy was determined using fluorescent
antibodies. The most...
Impacts of elemental S applied under various temperature and moisture regimes on pH and available P in acidic, neutral and alkaline soils
Biology and Fertility of Soils - Tập 41 - Trang 52-58 - 2004
We evaluated the effect of elemental S (S0) under three moisture (40, 60, 120%
water-filled pore space; WFPS) and three temperature regimes (12, 24, 36°C) on
changes in pH and available P (0.5 N NaHCO3-extractable P) concentrations in
acidic (pH 4.9), neutral (pH 7.1) and alkaline (pH 10.2) soils. Repacked soil
cores were incubated for 0, 14, 28 and 42 days. Application of S0 did not alter
the tre...
Azospirillum strains isolated from roots and rhizosphere soil of wheat (Triticum aestivum L.) grown under different soil moisture conditions
Biology and Fertility of Soils - Tập 46 - Trang 393-406 - 2010
The present study deals with the isolation and characterization of Azospirillum
strains isolated from roots and rhizosphere soil of wheat (at tillering and
anthesis stages) plants grown under different moisture regimes in the field and
in pots. The survival of Azospirillum isolates from plants of irrigated field
and those from well-watered pots was higher than that of Azospirillum strains
isolated...
Geographical and plant genotype effects on the formation of arbuscular mycorrhiza in Avena sativa and Avena nuda at different soil depths
Biology and Fertility of Soils - - 2010
Facilitation of seedling growth and nutrient uptake by indigenous arbuscular mycorrhizal fungi in intensive agroecosytems
Biology and Fertility of Soils - Tập 50 - Trang 381-394 - 2013
A modified in-growth core technique was employed to determine the contribution
of indigenous arbuscular mycorrhizal fungi (AMF) to plant growth and nutrient
uptake in intensive agroecosystems at two Experimental field sites at
Shangzhuang (Experiment I) and Quzhou (Experiment II) in North China. The growth
cores (26.5 cm depth, 5 cm diameter for maize plants, and 4 cm for alfalfa and
tomato plants...
Plant residue-derived hydrophilic and hydrophobic fractions contribute to the formation of soil organic matter
Biology and Fertility of Soils - Tập 57 - Trang 1021-1028 - 2021
The fate of hydrophilic, hydrophobic, and insoluble fractions extracted from
13C-labelled maize straw and their use for the formation of bacterial and
fungal-derived amino sugars (AS) were monitored during a 40-day incubation of
upland and paddy soils. The highest sequestration of C in the AS pool was
present in the hydrophilic fraction in both soils (1.1–1.4% of input C).
Bacterial community in u...
Changes in sorption/bioavailability of imidacloprid metabolites in soil with incubation time
Biology and Fertility of Soils - Tập 33 - Trang 546-550 - 2001
Changes in sorption/bioavailability of two metabolites, imidacloprid-urea
{1-[(6-chloro-3-pyridinyl)methyl]-2-imidazolidinone} and imidacloprid-guanidine
{1-[(6-chloro-3-pyridinyl)methyl]-4,5-dihydro-1H-imidazol-2-amine} of the
insecticide imidacloprid
{1-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolidinimine} with aging in
different soils were determined. Soil moisture was adjusted to –33 kP...
Fate of Azolla spp. and urea nitrogen applied to wetland rice (Oryza sativa L.)
Biology and Fertility of Soils - Tập 8 - Trang 102-110 - 1989
Using 15N, the fate of N applied to wetland rice either as Azolla or urea was
studied in a field at the International Rice Research Institute (IRRI). In
bigger plots nearby, yield response and N uptake were also determined with
unlabelled N sources. Azolla microphylla was labelled by repeated application of
labelled ammonium sulfate. Labelled and unlabelled N were used alternately in
applications ...
Isoelectric focusing of humic substances on ultrathin polyacrylamide gels: evidence of fingerprint performance
Biology and Fertility of Soils - Tập 18 - Trang 163-167 - 1994
Differentiated interactions between humic substances and isoelectric
focusing-carrier ampholytes were demonstrated by comparing specific absorption
ratios from the supernatant after precipitation with 2 M HCl and with acid
ampholytes (pH 2–4) containing both carboxylic and sulphate groups. An
increasingly stronger interaction was observed when comparing soil humic
substances to those of synthetic ...
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