Zobrazeno 1 - 10
of 26
pro vyhledávání: '"G. P. WARREN"'
Publikováno v:
Soil Use and Management. 32:54-63
Publikováno v:
Soil Use and Management. 32:138-148
Regular application of phosphorus (P)-rich biosolids to limited land areas poses a potential eutrophication risk because of rapid soil P accumulation and increased transport of P in land runoff to receiving waterbodies. To assess the effect of biosol
Publikováno v:
Nutrient Cycling in Agroecosystems. 84:167-178
Heat-treated animal bone char (ABC) has not previously been evaluated for its potential as a phosphorus (P) fertilizer. ABC, Gafsa phosphate rock (GPR) and triple superphosphate fertilizer (TSP) were incubated in 12 soils. Dissolved-P was assessed by
Publikováno v:
Nutrient Cycling in Agroecosystems. 76:341-354
The sustainability of cereal/legume intercropping was assessed by monitoring trends in cereal or legume grain yield, soil organic C (SOC) and soil extractable P (Olsen method) measured over 13 years of field experimentation on a P-deficient soil in s
Publikováno v:
Agroforestry Systems. 63:125-131
The combined use of organic residue and inorganic fertiliser-phosphorus (P) is appropriate in meeting both the short and long-term P requirement of crops. To assess the influence of added inorganic fertiliser-P on the processes of decomposition and P
Publikováno v:
Nutrient Cycling in Agroecosystems. 69:73-84
A dual isotopic technique was used to assess the effects of soil type, and residues of Gliricidia sepium, without and with added fertiliser-P on the utilisation of P. Upland rice (Oryza sativa) was grown for 70 days in two tropical acid soils of diff
Autor:
F.M. Kihanda, G. P. Warren
Publikováno v:
Soil Use and Management. 17:222-228
15N labelled NH 4 NO 3 (fertilizer N) was applied at a rate of 50 kg N ha -1 to an Ando-Humic Nitisol and two maize crops grown on it. About 20 months later, soil cores were taken to a depth of 2.5m. Leached fertilizer N was found between 1.4 m and 1
Autor:
D. S. Jenkinson, Jenesio I. Kinyamario, Roland Bol, D. D. Harkness, J. Meredith, G. P. Warren, Mike Wong, Kevin Coleman
Publikováno v:
Ecology. 80:2762-2773
A model for the turnover of organic matter in soil, ROTHC-26.3, can be used to calculate how much organic C needs to enter a soil annually in order to maintain a specified stock of soil organic C. The annual return of organic C thus calculated, plus
Autor:
S. J. McKean, G. P. Warren
Publikováno v:
Communications in Soil Science and Plant Analysis. 27:2397-2417
An alternative method for examining phosphate desorption characteristics in soil was tested. Five tropical soils with very different phosphate sorption capacities were incubated with added phosphate under three different conditions: 2 days at 25°C,
Autor:
M. L. V. Fernandes, G. P. Warren
Publikováno v:
Fertilizer Research. 44:1-8
Six Portuguese soils of varying P sorption capacity were incubated aerobically at 30° C without and with added P in order to give 0.1.mg P L−1 in the soil solution. Two methods of measuring extractable P were compared: (i) mixed-bed cation-anion-r