Biology and Fertility of Soils
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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 mos......
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
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 k......
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 ......
Determination of soil microbial biomass phosphorus in acid red soils from southern China
Biology and Fertility of Soils - Tập 39 - Trang 446-451 - 2004
A CHCl3 fumigation and 0.03 M NH4F-0.025 M HCl extraction procedure was used to measure microbial biomass P (Pmic) in 11 acid red soils (pH <6.0) from southern China and the results compared to those obtained by the commonly-used CHCl3 fumigation and 0.5 M NaHCO3 extraction method. Extraction with NH4F-HCl was found to be more effective and accurate than NaHCO3 extraction for detecting the increas......
Characterization of a cowpea (Vigna unguiculata) rhizobiophage and its effect on cowpea nodulation and growth
Biology and Fertility of Soils - Tập 18 - Trang 297-301 - 1994
A cowpea rhizobiophage (JRW 3 phage) from Jamaican soil was isolated and characterized. The phage has a polyhedral head and a non-contractile tail; maximum adsorption of the phage to the host occurred after 5 min. A one-step growth experiment revealed that the latent period, rise period and burst size of JRW3 phage were 12 h, 16 h, and 28 plaque-forming units/cell, respectively. The JRW 3 phage wa......
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