Phosphorus budget and soil extractable dynamics in field crop rotations in mollisols

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A better understanding of the P cycle is necessary to provide insights into management strategies that could enhance P bioavailability for crops. Our objectives were to evaluate the effects of continuous P fertilization on [i] the P budget, [ii] soil-extractable P [Pe] dynamics, and [iii] the relati...

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Detalles Bibliográficos
Otros Autores: Ciampitti, Ignacio Antonio, García, Fernando Oscar, Picone, Liliana Inés, Rubio, Gerardo
Formato: Artículo
Lenguaje:Inglés
Materias:
ANNUAL RATES
CORN [ZEA MAYS L.]
CROP ROTATION
IN-FIELD
MANAGEMENT STRATEGIES
MOLLISOLS
P REMOVAL
P-CYCLES PER UNIT
SOYBEAN [GLYCINE MAX [L.] MERR.]
TRITICUM AESTIVUM
AMINO ACIDS
BIOCHEMISTRY
BUDGET CONTROL
CROPS
GRAIN [AGRICULTURAL PRODUCT]
NITROGEN FIXATION
PHOSPHORUS
SOIL MECHANICS
SOIL TESTING
SOILS
ROTATION
BIOAVAILABILITY
DOUBLE CROPPING
FARMERS ATTITUDE
FERTILIZER APPLICATION
MAIZE
MANAGEMENT PRACTICE
MOLLISOL
SOIL DYNAMICS
SOIL TEST
SOYBEAN
WHEAT
GLYCINE MAX
ZEA MAYS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Ciampitti.pdf
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Biblioteca Central (FAUBA) de Universidad de Buenos Aires
Descripción
Sumario:A better understanding of the P cycle is necessary to provide insights into management strategies that could enhance P bioavailability for crops. Our objectives were to evaluate the effects of continuous P fertilization on [i] the P budget, [ii] soil-extractable P [Pe] dynamics, and [iii] the relationship between these variables. Two crop rotations during a 6-yr period were analyzed in seven on-farm experiments: corn [Zea mays L.]-double cropped wheat [Triticum aestivum]/soybean [Glycine max [L.] Merr.] [C-W/S], and corn-soybean-double croppedwheat/ soybean [C-S-W/S]. Calculations of net P input considered only P removal [output] and fertilization [input]. Initial soil-test P was 13.4 mg P kg-1 [average for the four sites] for the C-W/S rotation and 37.9 mg P kg-1 for the C-S-W/S rotation [average for the three sites]. Treatment combinations were two annual rates: unfertilized and grain P removal estimation +10 percent [average 34 kg P ha-1 yr-1 ]. Not applying P to soils testing 45 to 68 mg kg-1 of initial Pe resulted in a steep Pe decline [slope 0.2 mg kg-1 per unit of negative P budget]. Nevertheless, soils with more than 25 mg kg-1 of initial Pe levels resulted in a very small and gradual decline [slope 0.02 mg kg-1 ]. Use of current P rates applied by local farmers probably results in a small soil-test P buildup with time. The P required to increase Pe by 1 mg P kg-1 was 11 and 8 kg P ha-1 yr-1 for the C-W/S and C-S-W/S rotations, respectively.
ISSN:0361-5995

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