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Alburquerque J.A.,Organic Waste Management | de la Fuente C.,Organic Waste Management | Campoy M.,Organic Waste Management | Carrasco L.,Organic Waste Management | And 6 more authors.
European Journal of Agronomy | Year: 2012

The usefulness of a digestate from an anaerobic codigestion process as a fertiliser product was evaluated in a field experiment using two horticultural crops (watermelon and cauliflower), during two successive growing seasons. The effects of the digestate were compared with those of a traditional organic amendment (cattle manure) and a conventional mineral fertiliser. Digestate addition to soil provided a source of available nutrients (nitrogen and phosphorus) in the short-term and had positive effects on soil biological properties such as microbial biomass and enzyme activities, compared to the non-amended soil. The digestate application to soil led to yields comparable to the mineral fertilisation for the summer watermelon crop. However, for the winter cauliflower crop, only plots treated with the mineral fertiliser had good production. Nitrogen from the digestate is rapidly and highly available for plant growth in the short-term but also can be easily lost, together with a slow rate of microbial processes due to low temperatures, could reduce the fertilising capacity of the digestate. This seemed to be the main limiting factor for the winter cauliflower crop, where digestate or cattle manure, used as basal dressing, were not enough to satisfy the crop demand for nitrogen during its whole growth cycle. © 2012 Elsevier B.V..


Baixauli C.,Fundacion Ruralcaja Grupo CRM | Aguilar J.M.,Fundacion Ruralcaja Grupo CRM | Giner A.,Fundacion Ruralcaja Grupo CRM | Nunez A.,Fundacion Ruralcaja Grupo CRM | And 5 more authors.
Acta Horticulturae | Year: 2013

A factorial experiment, was carried out in a greenhouse with pepper cv. Italverde (Italian type) in soilless culture using coir media that had been already been used for two years. Three media were tested based on ratios of coir dust and coir chips in the following proportions (% by volume respectively); 100:0, 60:40 and 40:60. These were compared under three irrigation schedules: high frequency (HF), medium frequency (MF) and low frequency (LF) derived respectively from a depletion ratio of 5%, 10% and 20 % of saturated substrate, in order to regulate nutrient solution use more efficiently. The results showed that significantly higher commercial yields (early and total yield) were obtained with the 100% coir dust and 60:40 coir dust: coir chip growing media. The greatest commercial yield was achieved with HF and MF frequency irrigation but the advantage was not statistically significant. Malformed fruit was the most important disorder reducing marketable yield, mainly in the 100% coir dust and 60:40 coir dust: coir chip growing media. Blossom-end-rot and sunscald only appeared at the end of this experiment; the highest BER incidence was in the 60:40 coir dust: coir chip substrate. Some statistically interactions between factors were also found. The greatest average marketable weight was obtained by low and medium frequency irrigation. The highest value of irrigation efficiency for marketable production was obtained by low frequency irrigation combined with the 60:40 coir dust: coir chip medium.


Baixauli C.,Fundacion Ruralcaja Grupo CRM | Aguilar J.M.,Fundacion Ruralcaja Grupo CRM | Najera I.,Fundacion Ruralcaja Grupo CRM | Nunez A.,Fundacion Ruralcaja Grupo CRM | And 5 more authors.
Acta Horticulturae | Year: 2013

The production of seed propagated artichoke is considered one possible alternative to the vegetative propagation of green and purple artichoke heads. One drawback of using seed propagated artichokes is their late entry into production. In this study different gibberellic acid (GA3) concentrations, sprayed over different cultivars of seed propagated artichoke, are analysed in order to know the influence on earliness, yield, quality and crop behaviour. The experiment was carried out at the Experimental Station of Foundation Ruralcaja in Paiporta (Valencia, Spain), using six seed propagated cultivars, three with green heads ('Imperial Star', 'Symphony' and 'Madrigal') and three with purple heads ('Opal', 'Opera' and 'Concerto'). On 21 July 2010 the potted plants were transplanted into a sandy loam soil, in lines 1.70 apart and 0.825 m between plants. Plants were sprayed three times every two weeks with GA3 at concentrations 0, 30, 60 and 90 mg L-1, starting on the 10 September. A foliar fertiliser was added at 0.1% (v/v) GA3 solution. In both green and purple head artichoke cultivars it was observed that the earliest cultivars need a lower concentration of GA3 (between 30 and 60 ppm) to produce in autumn, while late cultivars need highest concentrations of GA3 (90 ppm). In general, the greatest final yield was achieved by the control and the highest concentrations of GA3 induced to a lowering final yield, especially in the earliest cultivars. This reduction was also observed in late cultivars ('Concerto' and 'Madrigal') with the highest concentration (90 ppm). The largest GA3 concentrations produced initially a greater growing and an erect aspect of plants. On the contrary, the highest plant height was noticed in plants sprayed with the lowest concentrations of GA3 and in control plants.

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