1,720,975 research outputs found
Soilless greenhouse production of table grape under Mediterranean conditions
No full textSoilless culture, widely used for vegetables, flowers and ornamental plants, can be an effective technique to grow table grape and to overcome several issues of the current vineyard production system (i.e. to facilitate variety change, no use of rootstock, extra-seasonal production and improved fruit quality). In this research two greenhouse experiments were carried out in Southern Italy, in a typical area for table grape cultivation, to determine the water consumption, vegetative growth, yield, and quality traits of table grapes grown in a soilless system. The first experiment was a simple comparison of two cultivars Cardinal and Victoria, whereas in the second experiment two cultivars (‘Black Magic’ and ‘Victoria’) were grown by using four nutrient solutions characterized by different macronutrient concentrations (100% Hoagland solution type vs 30%-reduced Hoagland: less N and P, or less N, P, Ca and Mg, or less N, P, K, Ca and Mg). In the first experiment, on average, at harvest the yield was 21.7 t ha-1, with a cluster weight of 419 g and 14.9 °Brix. In the second experiment, yield and cluster weight were, on average, 29.4 t ha-1 and 686 g, respectively, and were not affected either by nutrient solution composition or by the cultivar. In both experiments the mean cluster weight and all the organoleptic characteristics were above the European Commission rule n. 2137/2002 limits. These results show that the soilless culture provides table grapes with quality traits completely suitable for international market quality standards, and it is possible to reduce the nutrient concentration of the nutrient solution without negative effects on yield and quality of soilless table grapes
Con la subirrigazione in vaso è possibile ridurre la concentrazione dei nutrienti nella soluzione nutritiva, ma non il volume del substrato
No full text
Postharvest evaluation of soilless-grown table grape during storage in modified atmosphere
No full textBACKGROUND: Soilless growth systems, developed mainly for vegetables and ornamental crops, have also been used recently as an alternative to soil culture for table grape in order to achieve optimal production performance. In this study, sensory, physical and chemical parameters were analysed in table grapes obtained from soil and soilless growth systems at harvest and during storage in air or modified atmosphere.
RESULTS: At harvest, soilless-grown berries were 30% firmer than those grown in soil. Moreover, they showed 60% higher antioxidant activity and total phenol content than soil-grown fruits. Modified atmosphere storage resulted in a better quality of table grapes comparedwith those stored in air. Furthermore, soilless growth wasmore suitable than soil growth for preserving visual quality and controlling rachis browning and weight loss.
CONCLUSION: Since the soilless system produces berries that are cleaner and of higher quality than those grown in soil, the implementation of soilless growth for the production of health-promoting and convenience fruits is suggested
Effect of silicon in the nutrient solution on the incidence of powdery mildew and quality traits in carosello and barattiere (Cucumis melo L.) grown in a soilless system
No full textCarosello and barattiere are herbaceous landraces belonging to the species Cucumis melo L. These landraces are grown in and consumed throughout the Puglia Region of southern Italy as unripened melons and are appreciated in place of cucumbers due to their improved quality profile. There are serious difficulties in the use of chemical disease control methods for these landraces due to frequent and long periods of harvest.The aim of this research was to study
the effect of the application of silicon (≤ 3.6 mM potassium silicate) in the nutrient solution on the yield, quality, and sensitivity to powdery mildew of carosello and barattiere plants. Carosello showed a higher sensitivity to powdery
mildew than barattiere. A supply of silicon reduced the severity (3.3% vs. 29.5%) and incidence (49.1% vs. 81.5%) of
powdery mildew on both carosello and barattiere, compared with non-Si-fed control plants.The relative water content of leaves was higher in Si-treated plants, without changes to membrane permeability. Carosello proved to be more productive than barattiere (6.0 vs. 2.2 kg fresh fruit per plant, respectively). Among the qualitative parameters
measured, total soluble solids and dry matter contents were higher in barattiere than in carosello fruit (4.0 °Brix and 4.95 g 100 g–1 FW vs. 3.6 °Brix and 4.81 g 100 g–1 FW, respectively). The silicon content of Si-fed carosello fruit was twice that of control fruit; whereas, the Si content of barattiere was not influenced by Si treatment
N-rate and N-source for producing artichoke cv. Concerto transplants in float bed under greenhouse conditions
No full textNew artichoke varieties has been released using seed-systems. Such seed-systems require research efforts to generate guidelines principles for producing high-quality transplants. The main aim of this research was to establish the optimum nitrogen source and rate effect on the quality of artichoke cv. Concerto transplants during a nursery period of 44 days. Transplants were produced using peat as substrate in polystyrene trays with 60 holes, which have been left floating during 30 minutes in a container purposed to performing the subirrigation process. On May 18, at the first true-leaf stage, started the subirrigation - three times per week - of the seedlings by using two N-sources (ammonium nitrate and urea) and 4 rates (50, 125, 200, 275 mg L-1) in the nutrient solution. All the assessments herein reported were done at the 4th true-leaf stage (June 30). Transplant height, leaf area, and fresh weight was higher with urea than ammonium nitrate. With N dose increasing, height, number of leaves, leaf area, fresh weight, specific leaf area (SLA) and SPAD index increased. Leaf number was higher at 200 mg L-1, while dry matter content was at 50 mg L-1. The highest N-rate had a positive effect on height, leaf area, fresh weight, and SLA of the transplants, altogether being well-fitted by a cubic relationship between these variables and N-dose. Alternatively, SPAD index suited well a linear relationship to N-dose. No interaction between N-dose and source was found. To produce high quality artichoke transplants can be appropriate to choose urea as N-source with a rate between 200-275 mg L-1
Confronto tra sistemi di coltivazione di carosello e barattiere in serra. II. Aspetti qualitativi
No full textConfronto tra sistemi di coltivazione di carosello e barattiere in serra I. Aspetti produttivi
No full text
- …
