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Publications (59)
Salinity is a major abiotic stress that affects physiological and biochemical processes in plants, reducing the growth, yield, and quality of crops. This problem has been intensified with the reduction of the cultivated area. This study evaluated the response of hydroponically grown tomato plants under salt stress to foliar applications of E. arven...
The increasing consumer interest in organic products is driving the rise of the agricultural sector. However, organic farming productivity was lower than conventional due to the reduction of external inputs, synthetic fertilizers, and pesticides. In this context, the use of organic biostimulant emerged as a promising solution. The aim of this study...
The Morro de Toix massif, located between Altea and Calpe on the Alicante coast in
southeastern Spain, features a seacliff coinciding with a vertical fault plane. The western sector shows a vertical plane up to 70 m high above mean sea level, while the eastern sector shows an overhanging up to 30 to 50 m high. In the first one there is an aligned f...
Soil salinization poses a significant threat to agricultural productivity, necessitating innovative agronomic strategies to mitigate its impact. This study focuses on improving salt stress resistance in tomato plants through the application of silicon (Si) in roots. A greenhouse experiment was carried out under normal conditions (control, and 1 and...
Soil characterization is essential for planning activities in urban areas in order to detect potential risks and understand the possible impacts derived from those activities. Nine soils located in Alicante (southeast of Spain) developed over construction debris were studied. Soil characteristics including mineralogy, elemental composition and meta...
Biostimulants are organic compounds from plant sources such as botanical extracts and bioactive substances that promote plant growth, enhance photosynthesis and increase crop quality. The accumulation of detached Posidonia oceanica leaves on coasts of the Mediterranean Sea results in economic problems, due to the rejection of the tourists who frequ...
Every year, many tonnes of Posidonia oceanica are removed from Mediterranean beaches to maintain the quality and pleasure of use of the beaches. Most of this waste ends up in landfills, entailing removal costs. In this work, the Posidonia oceanica material was characterised, and a washing system was developed to obtain biochar. An adequate washing...
The goal of this paper is the characterisation of seven clays of the province of Alicante (SE Spain) and their possible use to improve the fertility, water absorption and contaminant-retaining capacity of degraded soils. Three soils affected by the dumping of construction debris were also studied to diagnose the problems and possible recovery strat...
The occurrence of hypoxic muddy sediments on shallow beaches and other sheltered areas is a well-known environmental problem, which negatively affects coastal areas, tourism potential, the public use of beaches and sediment biodiversity. The usual solution is limited to dredging and removal of sludge to a landfill site. In this study, a laboratory-...
Aims
The objective of this paper was to develop a method based on infrared spectroscopy to compare mineral content in soils and apply it to evaluate soil mineralogical variations in pairs of inter-patch and patch soils in a semi-arid area.
Methods
Mixtures of several minerals were analyzed by infrared spectroscopy, the second derivative of the spe...
Libreto Geolodía Alicante 2019: Busot
A method for quantitative mineralogical analysis by ATR-FTIR [1] has been used first time for analysis of historical mortars. Mixtures of different minerals and gypsum were used in order to measure the minimum band intensity that must be considered for calculations and the detection limit. In this way, the molar absorptivity coefficient in the Lamb...
Two o,o-EDDHA/Fe(3+) formulations (meso: 93.5% w/w of meso isomer, and d,l-racemic: 91.3% w/w of d,l-racemic mixture) were prepared, and their efficacy to avoid or to relieve iron deficiency in Fe sufficient and Fe deficient tomato plants grown on hydroponic solution was compared with the current o,o-EDDHA/Fe(3+) formulations (50% of meso and d,l-r...
A method for quantitative mineralogical analysis by ATR-FTIR has been developed. The method relies on the use
of the main band of calcite as a reference for the normalization of the IR spectrumof a mineral sample. In this way,
the molar absorptivity coefficient in the Lambert–Beer law and the components of a mixture in mole percentage
can be calcul...
The objective of this work was to study the effect of root and foliar application of two commercial products containing amino acids from plant and animal origin on iron (Fe) nutrition of tomato seedlings cultivated in two nutrient media: lime and normal nutrient solutions. In the foliar-application experiment, each product was sprayed with 0.5 and...
Repositorio Institucional RUA: http://rua.ua.es/dspace/handle/10045/25861
El objetivo de este estudio es analizar la participación así como el rendimiento académico de los alumnos de la Facultad de Ciencias que han cursado estudios dentro de los programas docentes de movilidad tanto nacionales (programas SICUE y DRAC) como extranjeros (programa ERASMUS y programa de movilidad no europea) durante los 5 últimos cursos acad...
http://library.iated.org/view/MARTINEZESPINOSA2011STU
ISSN: 2340-1079
Repositorio Institucional RUA: http://hdl.handle.net/10045/19881
Repositorio Institucional RUA: http://hdl.handle.net/10045/19884
The aim of the present paper is to evaluate the changes of organic matter during the composting process of fresh winery and distillery residues (WDR) by means of classical and chemometric analysis of (13)C cross-polarization magic angle spinning (CPMAS) NMR and Fourier transform infrared (FT-IR) spectra. (13)C NMR spectroscopy displayed a preferent...
Ferric ethylenediamine- N, N'-bis-(o-hydroxyphenylacetic)acid chelate (Fe(o, o-EDDHA)) is one of the most effective Fe fertilizers in calcareous soils. However, humic substances are occasionally combined with iron chelates in drip irrigation systems in order to lower costs. The reactivity of iron chelate-humic substance mixtures in several soil com...
The most widely used Iron (Fe) fertilizer in calcareous soils is the synthetic chelate Fe(o,o-EDDHA). However, humic substances are occasionally combined with Fe chelates in drip irrigation systems in order to lower costs. We investigated the effect of various mixtures of Fe(o,o-EDDHA) and a commercially available humic substance on Fe availability...
The aim of the present paper is to assess the maturity degree reached by different samples of several mixtures from winery and distillery residues composted using the Rutgers composting system, by means of excitation-emission matrix (EEM) fluorescence spectroscopy. The composts were sampled once a week for about 200d. EEM spectra indicate the prese...
The possibility of using thermal analysis for a quick characterization of chemical changes was tested in the organic matter from composting materials. Differential thermal analysis (DTA), thermogravimetry (TG) and the first derivative of the TG (DTG) were calculated in oxidizing conditions on compost samples obtained from three composting piles. Th...
Foliar spraying of commercial humic substances of different origin (leonardite, peat and plant residues) on Lycopersicum esculentum Mill cv. Durinta and cv. Jaguar, grown on soilless culture under several salinity levels, showed different effects depending on the cultivar, salinity level and origin of the humic substances. The three humic treatment...
Lemon trees cv. Fino were fertilized with mixtures of FeEDDHA and humic compounds (leonardite) or aminoacids. All the treatments improved the iron (Fe) uptake respect to a control fertilized only with FeEDDHA. The effect was more marked with humic substances (HS). The copper (Cu) uptake also increased, which can be a direct effect of the organic co...
One of the most efficient fertilizers to correct Fe deficiency in calcareous soils and waters with high bicarbonate content is based on ferric ethylenediamine-N,N'-bis(o-hydroxyphenylacetic) acid [Fe(o,o-EDDHA)]. Fe(o,o-EDDHA) forms two groups of geometric isomers known as meso and D,L-racemic. To determine the Fe uptake from meso and D,L-racemic F...
Two experiments in consecutive years were conducted at a table grape plantation located in southeastern Spain. The objective was to test whether the addition of commercial organic compounds could improve the uptake of iron (Fe) by plants. A commercial humic substance and two mixtures of amino acids were used as organic compounds in the first experi...
Higher plants are able to develop two different strategies in order to increase iron availability in soils. Strategy I is developed by dicot and non-graminaceous monocot species. Strategy II is developed by graminaceous species. In soils and/or irrigation waters with high bicarbonate content, the activity of Strategy I can be neutralized, causing s...
Two experiments in consecutive years were conducted in a commercial greenhouse located in the Southeast of Spain. The objective was to test if the addition of commercial organic compounds could improve the uptake of iron (Fe) by tomato plants (Lycopersiconesculentum mill.) cv Daniela. A commercial humic substance (HS) and a mix of amino acids (AA)...
Dehydrogenase activity, alkaline phosphatase activity and NH4
+, NO2
− and NO3
− concentrations were monitored in an aridisol treated with three commercially available humic amendments. The materials were of plant residue, lignite and peat origins. The humus plant residues, fulvic acids, with a high content of Kjeldahl-N, sustained high enzyme acti...
The chelates of iron with EDDHA and related chelating agents are stable in a wide range of pH values and have proved to be very effective to supply iron to plants. These compounds are also important in soilless and controlled cultures where iron needs may be higher than in plants grown in soil. FeEDDHA is affected by the preparation and the composi...
The decomposition - recomposition reaction, under acidic condition, of the isomers of the iron chelates with o-EDDHA and EDDHMA is studied by HPLC and compared with a UV-Vis method. At pH 2.0, the iron complexes are partially decomposed. The decomposition affects mainly the isomer with lower stability constant: meso for FeEDDHA and the racemic in t...
The iron chelate etilendiamine-di-o-hydroxiphenilacetateferrate (III) (FeEDDHA), decomposes quickly at low pH values. This reaction is reversible except when ions that compete with Fe for EDDHA or with EDDHA for iron occur in the solutions. Till now, all the experiments have studied the influence of a sole competing ion on the reaction. The joint e...
The complexes of iron and o-EDDHA or EDDHMA decompose at low pH values although they are quickly recovered when pH increases. However this later reaction is affected by the occurrence in solution of cations different from iron or anions different from the chelating ligand. The influence of these ions depends on the chelate and on the isomeric form....
Arsenite sorption was studied at different temperatures (30,40, and 50°C) to investigate processes that remove arsenite from soil solution (adsorption or precipitation), and if adsorption was taking place, how many sites were involved in this process, and their nature. Adsorption was the only reaction reducing levels of soluble arsenite in the two...
Iron chelates are widely used in fertigation because of their high stability and solubility. However, sudden changes of pH or concentrations of accompanying ions affect chelate stability and make kinetics as relevant as equilibrium data. The kinetics of FeEDDHA and FeEDDHMA reactions at acidic pH values in the presence and absence of calcium (Ca),...
In the attempt to find new products which release nutrients in gradual forms, the behavior of two commercial fertilizers was studied, Nitrophoska® (N) and urea (U), covered with two organic materials, humic acid (HA) and alginic acid (AA). The release of nitrogen from the fertilizers was determined by electroultrafiltration (EUF). These applied mat...
A greenhouse pot experiment was designed in order to test the effect that the addition of two organic materials, EDDHA and humic acid would have on the availability of P released from three P fertilizers, 8–24–8, 20–20–20, and MAP (monoamonium phosphate). Phosphorus was extracted from soil by three different methods (Burriel‐Hernando, Olsen, and EU...
We have performed series of batch experiments at different temperatures and times to study the kinetics of FeEDDHA reaction in a calcareous soil. Several kinetic equations (zero-order, first-order, two constant, parabolic, and Elovich equations) were applied to obtain the correspondent rate constants. First-order, two-constant, parabolic, and Elovi...
Laboratory, pot and field experiments were performed to study the behaviour of the chelates FeEDTA and FeEDHHA in calcareous soils. Total Fe, Fe extracted with 2,2’bipyridyl, ash alkalinity and yield were measured in the plant. Iron remaining in the soil following extracting with DPTA was determined.
Laboratory results showed an inverse relationshi...
We have obtained an empirical equation, C$= bCo t, to describe behaviour of FeEDDHA in calcareous soils. Parameter “c”; of the previous equation remains practically constant from one soil to another, while parameters “b”; and “a”; have a lineal variation according to the carbonate content of the soils, which allows us to propose the following equat...
