Buscador

Encontrado(s) 24 resultado(s)
Encontrada(s) 3 página(s)

Técnicas de cultivo del granado

  • Bartual, Julián
  • Bonet, Luis
  • Intrigliolo, Diego S.
  • Palou, Lluís
  • Pomares, Fernando
Proyecto:


Efecto de la salinidad sobre la maduración y comportamiento postcosecha de frutos de caqui 'Rojo Brillante'

  • Besada, Cristina
  • Intrigliolo, Diego S.
  • Bonet, Luis
  • Gil, Rebeca
  • Salvador, Alejandra
Proyecto:


Obtención de una pauta de riego eficiente para el cultivo del caqui (Diopyros kaki) empleando indicadores del continuo suelo-planta-atmósfera

  • Bonet, Luis
  • Buesa, I.
  • Ferrer, Pedro J.
  • Intrigliolo, Diego S.
El cultivo del caqui (Diospyros kaki) ha cobrado una gran importancia en determinadas zonas agrícolas de la Comunidad Valenciana, donde además la escasez de recursos hídricos es una realidad. En la actualidad no se dispone de información acerca de las necesidades de agua idóneas para la explotación comercial de esta especie, en consecuencia, el Instituto Valenciano de Investigaciones Agrarias está llevando a cabo una experiencia con el fin de obtener una pauta para el manejo óptimo del riego del caqui, empleando para ello indicadores del estado hídrico del suelo, de la planta y la demanda evaporativa de la atmósfera. Combinando toda esta información se generan informes-recomendaciones de riego que son directamente transferidos al agricultor para su puesta en práctica en la explotación comercial en la que se ubica la experiencia
Proyecto:


Moderate plant water stress reduces fruit drop of "Rojo Brillante" persimmon (Diospyros kaki) in a Mediterranean climate

  • Badal, E.
  • Abd El-Mageed, T. A.
  • Buesa, I.
  • Guerra, D.
  • Bonet, Luis
  • Intrigliolo, Diego S.
Spring fruit drop is a crucial determinant for yield in persimmon trees. Several environmental and tree endogenous factors can determine the magnitude of this physiological phenomenon. In this sense, plant water status might play a pivotal role in persimmon fruit drop occurring-during spring. The main purpose of this study was to establish and quantify the effects of plant water stress on fruit drop of the 'Rojo Brillante' persimmon cultivar. To achieve this goal, a field experiment was conducted during three consecutive seasons with mature trees. Three irrigation regimes were tested: Control, always well watered; and two deficit irrigation (DI) treatments where water was applied at 50% of the Control regime during May and June (DIearly) or during July and August (DIlate). Plant water stress was monitored by means of midday stem water potential (Psi(stem)) readings. The seasonal variation of fruit drop was quantified during the entire fruit abscission period. Both DI regimes led to lower fruit drop than the Control (31 and 12% lower fruit drop for DIearly and DIlate, respectively). In addition, in the last two experimental seasons, there was a highly significant relationship between the amount of fruit that dropped during the physiological fruit drop and the average DIearly for the period of water restrictions. However, the timing of water stress also affected the existing relationships. Early season water stress had a greater effect on reducing fruit abscission during the second wave of fruit drop. In semi-arid climates, this knowledge can be used for increasing 'Rojo Brillante' persimmon fruit set by restricting irrigation applications during late spring. (C) 2013 Elsevier B.V. All rights reserved.
Proyecto:


Maximum diurnal trunk shrinkage is a sensitive indicator of plant water, stress in Diospyros kaki (Persimmon) trees

  • Badal, E.
  • Buesa, I.
  • Guerra, D.
  • Bonet, Luis
  • Ferrer, Pedro
  • Intrigliolo, Diego S.
Persimmon tree (Diospyros kaki Lf) is a deciduous fruit tree included in the so-called group of minor fruit tree species Worldwide It is not widely grown but nowadays Kaki culture is of some importance in the south-east of Spain because of the high fruit commercial value Currently neither it is known about Kaki trees water needs nor crop responses to the irrigation regime The objective of the present research was to assess the feasibility of using maximum diurnal trunk shrinkage (MDS) as a plant water stress indicator for Kaki trees During two drought cycles in trees under either full or deficit irrigation the MDS obtained by means of LVDT sensors was compared with a reference indicator of fruit trees water status the midday stem water potential (Psi(stern)) In addition stomatal conductance and fruit diameter variations were also. followed As water restrictions began there was an immediate increase in MDS in correspondence with a decrease in Psi(stern) Pooling data from both drought cycles and irrigation regimes MDS and Psi(stern) were linearly correlated (r(2) = 0 77***) The magnitude of differences between well watered and deficit irrigated trees was much larger in the case of MDS than for Psi(stern) However the tree-to-tree variability of the MDS readings was three times higher than for Psi(stern) average coefficient of variation of 14% and 38% for 'Poem and MDS respectively Overall results reported indicated that MDS is a sensitive indicator of Kaki water status and it can be further used as an irrigation scheduling indicator for optimum irrigation management of this crop However the large MDS tree-to-tree variability should be taken into account when selecting the number of trees to monitor within an orchard (c) 2010 Elsevier B V All rights reserved
Proyecto:


Usefulness of stem dendrometers as continuous indicator of loquat trees water status

  • Ballester, Carlos
  • Buesa, I.
  • Bonet, Luis
  • Intrigliolo, Diego S.
Postharvest regulated deficit irrigation (RDI) is an effective strategy to hasten flowering and harvest in loquat (Eriobotrya japonica Lindl.) trees, which in the Mediterranean countries has been related to an increase in the economic return. The success of an RDI strategy, however, depends on the duration and severity of the water stress reached by the trees. When RDI is applied, then, it is important to regularly monitor the plant water status. The measurement of the trunk diameter variations by means of stem dendrometers, which can be automated to remotely determine the plant water status, is a proven method for many fruit trees. In loquat, however, its use has not been yet assessed. In this experiment performed in a loquat orchard planted with the cv. 'Cardona' during the summer of 2009, the suitability of using stem dendrometers to detect plant water stress was assessed by taking measurements in fully irrigated and trees subjected to a drought cycle of 47 days. Results showed that at the beginning of the drought cycle period there was an increase in the maximum daily trunk shrinkage (MDS) in non-irrigated trees even before that clear differences in stem water potential (Psi(s)) could be detected between treatments. However, when plant water stress became more severe (Psi(s) lower than -1.4 MPa), MDS did not increase further. The maximum trunk diameter (MXTD) evolution in control trees showed a steadily increase in trunk growth during the whole experimental period. In non-irrigated trees, however, MXTD remained stable until the end of the treatment when irrigation was resumed. The Psi(s) was the most sensitive indicator to water stress due to its very low tree-to-tree variability in comparison with the other indicators. Overall results show that trunk diameter variations have some limitations to monitor plant water status in loquat RDI orchards and therefore new alternatives should be explored. (C) 2014 Elsevier B.V. All rights reserved.
Proyecto:


Effects of a commercial calcium protein hydrolysate on the salt tolerance of Diospyros kaki L. cv. "Rojo Brillante" grafted on Diospyros lotus L.

  • Visconti, Fernando
  • Paz, Jose Miguel de
  • Bonet, Luis
  • Jorda, Miguel
  • Quinones, Ana
  • Intrigliolo, Diego S.
Diospyros lotus L is advantageously used as rootstock for Diospyros kaki L cv. "Rojo Brillante" in most plantations of Eastern Spain. However, one of the few drawbacks of D. lotus L as rootstock, is the high sensitivity to soil salinity, and specifically chloride, it imparts to the scion, which is visually detected as an extensive late season leaf necrosis. Several complex mixtures of organic polymers such as calcium protein hydrolysates (CPH) have been recommended to counteract salt stress on plants. Nevertheless, the effects of these commercial complex products on tree crops, are not usually rigorously studied, nor satisfactorily explained. The effects on soil and plant of the addition of a commercial CPH in the irrigation water of a D. kaki L. cv. "Rojo Brillante" plantation grafted on D. lotus L were studied during two successive seasons. Soil salinity and chloride contents, significantly, but slightly, increased in CPH treated subplots, while at the same time leaf chloride contents decreased. These effects suggest a lower chloride plant uptake in CPH treated subplots. The lower chloride uptake in CPH treated trees was accompanied by less leaf necrosis, and also lower leaf water potential. However, the yields of CPH treated and non-treated trees were statistically non-different. The build-up of compatible solutes, mainly proline and glycine betaine, in addition to the biosynthesis of salt-stress-response proteins, which would have been stimulated by the CPH, could explain the observed effects. However, the likely biosynthesis of all these substances may have drawn plant resources from fruit development, thus explaining why yields were the same in treated and non-treated subplots despite the trees in treated subplots showed better adaptation to soil salinity. (C) 2015 Elsevier B.V. All rights reserved.
Proyecto:


Soil capacitance sensors and stem dendrometers. Useful tools for irrigation scheduling of commercial orchards?

  • Bonet, Luis
  • Ferrer, Pedro
  • Castel, Juan R.
  • Intrigliolo, Diego S.
Irrigation scheduling is often performed based on a soil water balance, where orchard evapotranspiration is estimated using the reference evapotranspiration (ETo) times the crop coefficient (Kc). This procedure, despite being widely spread, has some uncertainties. Because of this, plant and soil water status monitoring could be alternatively or complementarily used to schedule irrigation. The usefulness of capacitance probes was evaluated during several seasons in large irrigation districts where irrigation practices were changed over years from the ETo * Kc model to the analysis of soil water status trend. This area corresponds to drip irrigated orchards planted with citrus, peach, nectarine and persimmon. Around 25% less irrigation was applied with no substantial yield penalty when the information provided by capacitance probes was correctly applied for irrigation management. On the other hand, the usefulness of stem dendrometers for continuously monitoring plant water status was evaluated in a young plum experimental orchard. Over two years, irrigation was scheduled using exclusively trunk shrinkage via the signal intensity approach by means of a baseline equation previously obtained in the orchard. Results showed that it was not always possible to schedule irrigation based on the trunk shrinkage signal intensity due to the temporal changes in the reference values that occurred as trees aged. Overall, results obtained are discussed in terms of the possible extrapolation at field level of both capacitance probes and stem dendrometers. Advantages and drawbacks of each technique are analyzed and discussed.
Proyecto:


Regulated deficit irrigation in persimmon trees (Diospyros kaki) cv. 'Rojo Brillante'

  • Buesa, I.
  • Badal, E.
  • Guerra, D.
  • Ballester, Carlos
  • Bonet, Luis
  • Intrigliolo, Diego S.
The response of persimmon trees to deficit irrigation applied in three different phenological stages was evaluated during three consecutive seasons in a commercial orchard planted with the cv. 'Rojo Brillante', the most important cultivar in the Mediterranean basin. The experiment was performed in a drip-irrigated orchard located in Valencia, Spain, planted with eight-year-old trees at a spacing of 5.5 m x 4 m and grafted on the rootstock Diospyrus lotus. Three regulated deficit irrigation (RDI) regimes were tested and compared to a Control treatment irrigated at full water requirements. In the RDI treatments, moderate water restrictions (50% of Control irrigation), were applied during one of three periods (i) RDIspring, where water restrictions were applied from late May to mid July; (ii) RDIsummer, deficit irrigated from mid July to late August and; (iii) RDIfall, in which water restrictions were applied from late August early September to mid November. Results showed that persimmon fruit growth was sensitive to water stress. RDI reduced final fruit weight being this reduction more marked in the most stressed treatment (RDIsummer). This decrease in fruit weight was also because spring and specially summer RDI treatments increased the number of fruit harvested. Thus, RDI techniques allowed water savings of up to 20% without any reduction in yield increasing significantly the water use efficiency. In spite of the similar yields obtained in RDI and control trees, the economic return was negatively affected by deficit irrigation, because the lower fruit weight resulted in a decrease in the fruit commercial value. In conclusion, fruit growth of persimmon cv. 'Rojo Brillante' was shown as highly sensitive to deficit irrigation. Based on the results obtained, RDI would need further research in order to define an RDI strategy that could increase water use efficiency without affecting the economic return. (C) 2013 Elsevier B.V. All rights reserved.
Proyecto:


Buscador avanzado