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- Title
Influence of summer crop residues on <sup>15</sup>N present in organic matter fractions under two lowland soils.
- Authors
Pollet, Carolina Schultz; da Silva, Leandro Souza; Chaves, Bruno; Neto, Lethícia Rosa; Dossin, Mariana Ferneda; Giacomini, Sandro José; Filho, Alberto Cargnelutti
- Abstract
The state of Rio Grande do Sul has about 20% of the total area as lowland soils, suitable for flooded rice (Oryza sativa). In order to mitigate damage caused by rice monoculture, new crops such as sorghum (Sorghum bicolor) and soybean (Glycine max) have been cultivated in these areas. With different qualities of crop residues, it is expected a change in soil organic matter (SOM) dynamics and consequently, nitrogen (N) availability. The objective of this study was to evaluate the influence of rice, soybean and sorghum crop residues on the N present in physical fractions of SOM of two lowland soils, using labeled 15N technique, under incubation for 180 days in aerobic condition and more 180 days in anaerobic condition. At 30, 180 and 360 days of incubation the remaining N of the plant residues and N destination from the residues in both soils were quantified in the physical fractions of SOM >250 µm, 250-53 µm and <53 µm. The soil with higher amount of clay+silt received a larger quantity of 15N from residues, while flooding of the soil after 180 days caused a loss of N added to the soil by the soybean and sorghum residues. In general, larger amounts of 15N were reported in the fraction <53 µm, associated with clay minerals, throughout the incubation period. These N losses should be considered in N fertilization for the following crops in rotation with flooded rice.
- Subjects
RIO Grande do Sul (Brazil : State); CROP residues; SORGHUM farming; HUMUS; SOILS; CROP rotation; ORGANIC compounds
- Publication
Ciência Rural, 2019, Vol 49, Issue 4, p1
- ISSN
0103-8478
- Publication type
Article
- DOI
10.1590/0103-8478cr20180747