Improving the Chemical Properties of Acid Sulphate Soils from the Casamance River Basin

[EN] The anoxic conditions produced after the reflooding of acid sulphate soil (ASS) can reduce sulphate and/or Fe(III) with a consequent rise in pH. This study aimed to compare the effect of different amendments on ASS remediation and to analyse the effect on soil pH and exchangeable aluminium. Two mid-term incubation experiments were carried out to analyse the effect of amendments and water management on ASS. Soil samples were taken in the Santak Valley from four agricultural plots. During the first experiment, each soil sample was subject to two water management systems (flooded and non-flooded) and three amendment types (rice straw, manure, and lime). During the second experiment, the flooded condition was performed with three organic amendments (rice straw, manure, and biochar). In the first experiment, the amendments with organic matter (rice straw, and manure) increased the pH more under the flooded conditions, and manure was effective in reducing exchangeable aluminium (Alex) to 45% in the control soil. In the second experiment, all the organic amendments reduced soluble Al, but whereas straw increased soluble Fe, biochar diminished it. The amendment addition increased the soil pH and reduced Alex. The Alex reduction was greater for the stabler organic amendments: manure and biochar.The authors acknowledge the Centre for Development Cooperation of the Universitat Politecnica de Valencia (CCD-UPV) for providing funds as part of Project AD1810-UPV.Bautista, I.; Oliver Talens, J.; Lidón, A.; Osca Lluch, JM.; Sanjuán Pellicer, MN. (2023). Improving the Chemical Properties of Acid Sulphate Soils from the Casamance River Basin. Land. 12(9):1-20. https://doi.org/10.3390/land1209169312012

Furrow and Ridge Soil Nitrogen Mineralization in a Surface Irrigated Artichoke Field

[EN] Quantitative knowledge of soil organic nitrogen net mineralization (NNM) in field conditions is crucial to optimize N fertilization of crops. In a field fertilization trial of artichokes 48 PE tubes were inserted to 20 cm depth in the soil in plant row and irrigation furrows and soil samples were periodically taken during two and a half months to determine NNM. A parallel essay with disturbed samples from the same procedence was carried out in the laboratory at 25ºC and 10 kPa soil water tension. Soil sample position (ridge and furrow) did not significantly determined NNM in the laboratory essay. Although NNM (obtained from laboratory incubation and corrected to field soil temperature and moisture monitored during the experimental period) overpredicted measured field NNM, matching of both was better than those reported in other studies. NNM rate for the 76 days period of incubation predicted from lab data was 22.9 kg N/ ha x 0.1 m while corresponding field values corrected by Br- or Cl- mass balance were 10% and 20% lower respectively in ridge position and under 40% lower by either method in furrow position.The research reported in this paper was supported by a fund from CICYT-INIA (project RTA01-117-C2-2)Lidón, A.; Bautista, I.; De La Iglesia, F.; Oliver Talens, J.; Llorca, R.; Cruz-Romero, G. (2006). Furrow and Ridge Soil Nitrogen Mineralization in a Surface Irrigated Artichoke Field. Acta Horticulturae. (700):71-74. https://doi.org/10.17660/ActaHortic.2006.700.7S717470

La reacción de los fertilizantes en el suelo

Se describe un ensayo que se puede realizar para observar el efecto que tienen las propiedades del suelo sobre los fertilizantes minerales añadidos al mismo. También se compara el comportamiento de dos suelos diferentes en función de sus propiedades químicas. De esta forma se refuerzan los conocimientos teóricos.https://media.upv.es/player/?id=62aa5fd3-d6b6-4834-afbc-736ebce1bdd0Bautista Carrascosa, MI.; Oliver Talens, J. (2013). La reacción de los fertilizantes en el suelo. http://hdl.handle.net/10251/3195

Descomposición de la materia orgánica del suelo

Descomposición de la materia orgánica del suelohttps://media.upv.es/player/?id=13f41633-2860-4de6-8dce-1eba77f87240Lull Noguera, C. (2009). Descomposición de la materia orgánica del suelo. http://hdl.handle.net/10251/571

Determinación de la materia orgánica de un suelo

Determinación de la materia orgánica de un suelohttps://media.upv.es/player/?id=7357df6f-586e-463c-9910-72959fa014deLull Noguera, C. (2009). Determinación de la materia orgánica de un suelo. http://hdl.handle.net/10251/571

Floculación y dispersión de las arcillas

Observar el efecto de la carga de los cationes sobre la floculación de las arcillashttps://media.upv.es/player/?id=0616d43c-db28-4e35-b82b-cce123f3e71cLull Noguera, C. (2009). Floculación y dispersión de las arcillas. http://hdl.handle.net/10251/571

Comprobación intercambio catiónico

Comprobación de la capacidad de intercambio catiónico de un suelohttps://media.upv.es/player/?id=c69c7af5-0051-449c-b4e1-e410ad67562fLull Noguera, C.; Bautista Carrascosa, MI.; Oliver Talens, J.; Lidón Cerezuela, AL.; Llinares Palacios, JV.; Serrano Torres, A.; Lado Monserrat, L. (2011). Comprobación intercambio catiónico. http://hdl.handle.net/10251/1080