Soil carbon and phosphorus pools in field crop rotations in pampean soils of Argentina
In temperate cropping systems, a better understanding of soil C and P transformations is pertinent to evaluate crop management consequences in the medium term. Six-year cropping systems experiments consisting of corn [Zea mays L.]-double-cropped wheat [Triticum aestivum L.]/soybean [Glycine max [L.] Merr.] [two sites] and corn-soybean-double-cropped wheat/soybean [two sites], with [Fp] or without P added [Wp], were evaluated in the Pampean soils of Argentina. The objectives were [i] to quantify the effects of continuous P fertilization on the size and vertical distribution of C and P in total organic C [TOC] and particulate organic matter [POM] fractions and [ii] to evaluate the POM-P fraction as a potential indicator of crop P availability. Annually, an average P rate of 34 kg P ha -1 was applied in Fp plots. The TOC, total P [TP], POM-C, and POM-P were measured in the 0- to 5-, 5- to 10-, and 10- to 20-cm soil depths at the end of the 6-yr period. Phosphorus fertilization increased TOC from 0.5 to 2.5 g C kg -1 and TP from 24.1 to 77.4 mg P kg -1 in the 0- to 20-cm depth. The POM-C and POM-P fractions were more sensitive than TOC or TP to P fertilization, increasing by 14 and 47 percent, respectively, in the 0- to 20-cm depth under continuous P addition. The greatest diff erences in POM-C and POM-P among treatments occurred in the surface soil layer. A signifi cant relationship was found between POM-P and corn P uptake at anthesis.
| Main Authors: | , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | CORN [ZEA MAYS L.], CROP MANAGEMENTS, CROPPING SYSTEMS, GLYCINE MAX, IN-FIELD, MEDIUM TERM, PARTICULATE ORGANIC MATTERS, POTENTIAL INDICATORS, SOIL CARBON, SOIL DEPTH, SURFACE SOIL LAYERS, TOTAL ORGANIC C, VERTICAL DISTRIBUTIONS, WHEAT [TRITICUM AESTIVUM L.], AMINO ACIDS, CROPS, NITROGEN FIXATION, PHOSPHORUS, RATING, SOILS, AGRICULTURAL SOIL, BIOAVAILABILITY, CROP ROTATION, EXPERIMENTAL STUDY, FERTILIZER APPLICATION, MAIZE, NUTRIENT AVAILABILITY, NUTRIENT UPTAKE, PARTICULATE ORGANIC MATTER, SIZE DISTRIBUTION, SOYBEAN, TOTAL ORGANIC CARBON, TRANSFORMATION, VERTICAL DISTRIBUTION, WHEAT, ARGENTINA, PAMPAS, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46797 |
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| Summary: | In temperate cropping systems, a better understanding of soil C and P transformations is pertinent to evaluate crop management consequences in the medium term. Six-year cropping systems experiments consisting of corn [Zea mays L.]-double-cropped wheat [Triticum aestivum L.]/soybean [Glycine max [L.] Merr.] [two sites] and corn-soybean-double-cropped wheat/soybean [two sites], with [Fp] or without P added [Wp], were evaluated in the Pampean soils of Argentina. The objectives were [i] to quantify the effects of continuous P fertilization on the size and vertical distribution of C and P in total organic C [TOC] and particulate organic matter [POM] fractions and [ii] to evaluate the POM-P fraction as a potential indicator of crop P availability. Annually, an average P rate of 34 kg P ha -1 was applied in Fp plots. The TOC, total P [TP], POM-C, and POM-P were measured in the 0- to 5-, 5- to 10-, and 10- to 20-cm soil depths at the end of the 6-yr period. Phosphorus fertilization increased TOC from 0.5 to 2.5 g C kg -1 and TP from 24.1 to 77.4 mg P kg -1 in the 0- to 20-cm depth. The POM-C and POM-P fractions were more sensitive than TOC or TP to P fertilization, increasing by 14 and 47 percent, respectively, in the 0- to 20-cm depth under continuous P addition. The greatest diff erences in POM-C and POM-P among treatments occurred in the surface soil layer. A signifi cant relationship was found between POM-P and corn P uptake at anthesis. |
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