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Ritmo di asportazione di elementi nutritivi (N, P, K) nelle diverse fasi del ciclo della carciofaia.
No full textLa fertirrigazione in orticoltura
No full textAbstract. In the last decade in Italy, fertigation has been increasing in vegetable crops production in both green-house and in open field cultivation. Fertigation, combining irrigation and fertilization, results effecti- vely in increasing both water and nutrient efficiency when correctly applied. Besides improving yield and quality of the crops and helping to minimize manage- ment costs, fertigation reducing mineral nutrient sup- ply is also beneficial for the environment by minimi- sing mineral leaching and nutrient losses. Application of low concentrations of nutrients results in lower accumulation of harmful compounds such as nitrates from nitrogen application. Correctly applied fertigation requires knowledge of both water and nutrient needs of the species and the characteristics of the soil. Fertigation could be applied to any irrigation system although the highest efficiency is reached by microirri- gation systems such as drip irrigation and sub-irriga- tion. In this paper, all parameters involved in fertiga- tion management are discussed, and information for a correct application of the technique are given. The nitrogen, phosphorous and potassium mineral needs of the most important vegetable crops are reported; daily elemental uptake of tomato for both processing and fresh market, eggplant, melon and lettuce are discussed. In addition to advice for an effective ferti- gation application, advantages and disadvantages are also analysed. References listed at the end of the paper can provide for further subject information
Residues in soil treated with lenacil and trifluralin in asuccession involving four vegetable crops | [INDAGINESUI RESIDUI DI TRATTAMENTI DISERBANTI CONTRIFLURALIN E LENACIL IN UNA PROVA DISUCCESSIONE DI SPECIE ORTICOLE DA INDUSTRIA]
No full textVariazioni del paesaggio agrario di Mola di Bari in funzione delle trasformazioni colturali: progresso o involuzione?
No full textMola di Bari, il primo comune a sud di Bari, è caratterizzato da una superficie totale alquanto modesta in rapporto alla popolazione residente. Negli ultimi vent'anni l’espansione del centro abitato ha sottratto all’attività primaria oltre 500 ha (il 10 % della superficie comunale). Parallelamente, l’attività estrattiva di terreno agrario destinato al miglioramento fondiario ha sottratto altre decine di ettari e ha prodotto enormi cave che rappresentano una vera minaccia ambientale. Con le grandi trasformazioni colturali, iniziate negli anni Venti e Trenta, l’uva da tavola e il carciofo hanno ridotto l’importanza dell’ulivo; l’agricoltura, allora prevalentemente in asciutto, è ora tutta irrigua. L’abbattimento degli alberi, l’attività estrattiva e l’utilizzazione di acqua sempre più salmastra hanno modificato il paesaggio agrario e ridotto le potenzialità produttive di Mola, che pure restano alte.COUNTRY LANDSCAPE CHANGES IN MOLA DI BARI ACCORDING TO AGRICULTURAL TRANSFORMATIONS: PROGRESS OR INVOLUTION? Mola di Bari, the first town at the south of Bari, is characterized by a rather small total surface, when compared with the inhabitants. During the last 20 years, more than 500 ha have been taken away from agricultural activities (10 % of total area). At the same time, the open excavation of agricultural soil to improve arable layers removed hectares of land and produced enormous quarries which represent an environmental menace. With the great agricultural changes begun in the Twenties and Thirties, table grapes and artichokes reduced the importance of olive trees while agriculture turned from dry to well-irrigated. Filling of trees, excavation activity and use of brackish water changed agricultural landscape and reduced productive potentialities of Mola’s agriculture
Azoto, temperatura, irradianza e contenuto dei principali anioni e cationi in foglie di cima di rapa
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