Milella, Antonio and Deidda, Pietro and Dettori, Sandro and Azzena, Mario Placido (1981) Influenza della posizione degli erogatori sulle componenti dello sviluppo e della produzione nell'arancio «Valencia»: risultati preliminari. Studi sassaresi: organo ufficiale della Società sassarese di Scienze mediche e naturali. Sez. 3: Annali della Facoltà di Agraria dell'Università di Sassari, Vol. 28 (1980-1981) , p. 221-232. ISSN 0562-2662. Article.
In this study two irrigation systems (drip and microjet) and different positions of emitters were compared in a young «Frost Valencia» orange grove. The following irrigation treatments were set out: - two drippers (4 l/h each) per tree at apposite distance of 1 m trom the trunk: - two drippers (4 l/h each) per tree at apposite distance of 0.5 m from the trunk; - two microjets (65 l/h) per tree at apposite distance of 0.2 m from the trunk. Both the irrigation systems were able to wet a 3 m strip of soil along the rows, while thc central part of interrows was kept dry. Among the wet area drip irrigation induced different soil moisture pattern, since the soil moisture percentage was greater near the emitters (more than the «field capacity») and particularly at 50 cm depth; and decreased as the distance trom the drippers increased. The water distribution under the microjets resulted more uniform and the soil moisture reached the highest values at 25 cm soil depth, alwais close to the emitters. Leaf water potential and leat diffusive resistance measured at different times did not show any symptom af water-stress, while trunk growth resulted not affected by different irrigation treatments.
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