1,721,139 research outputs found
Influenza della tipologia dell’ovolo e della temperatura sul ciclo vegetativo e produzione in carciofo
No full textL’orticoltura di pieno campo in Sardegna nel periodo 1994-2006: evoluzione di incidenza economica sul comparto agricolo
No full textSalt concentration of The Nutrient Solution: Effects on Transpiration Rate of Soilless Colture
No full textMain objective of the study was to verify the possibility of testing salt
concentration effects on transpiration rate over an entire cycle of a crop, by using
hydroponic lysimeters. The experiment was carried out in North - West of Sardinia
(Italy). In 1996, nine hydroponic cropping units (CU) were used to measure
transpired water and cotton (Gossypium hirsutum cv. ‘Ogosto’) was utilized as test
crop. Three salt concentration levels were obtained adding seawater to the nutrient
solution: control (0% of seawater, EC 3.0 mS cm-1, pH 7.1), S8 (8% of seawater, EC
7.7 mS cm-1, pH 6.7) and S16 (16% of seawater, EC 11.5 mS cm-1, pH 6.4). Results
indicate that cotton plants are able to develop and produce with 8% of added
seawater without differences with control treatment, as previously assessed by other
authors. High level of salt concentration reduced plant growth and productivity and
increased TAF (transpiration per unit of leaf area, mm d-1). The hydroponic
lysimetric system proved to be an effective tool to study the effects of water salinity
on water transpiration per unit of leaf area during the whole crop cycle and hence to
distinguish the effects of salinity on plant development from the effects on leaf
transpiration
Valutazione di alcuni caratteri di aridoresistenza in popolazioni sarde di Dactylis glomerata L
No full text
Influenza delle limitazioni nell'uso del Bromuro di Metile sull'orticoltura in serra della Sardegna
No full textRoots system development in flooded and sprinkler irrigated rice cultivars
No full textOne of the most important factors to obtain high yield is a good root system development.
The exploration of a greater soil mass allows a higher water and nutrient uptake and increases crop yield. Numerous authors noticed a significant correlation between yield and root system dimension.
The growing environment, and therefore the agronomic technique, affect root system
development.
Traditionally rice is grown by flooded irrigation that, due to oxygen lack in deep soil layers, brings to a low root system deepening. In upland rice, where the growing does not take place with continuous flooding, some authors noticed a good root system development.
A comparison trial, with national and selected for upland conditions rice cultivars, was carried
out to evaluate root system development adopting both traditional flooded irrigation and sprinkler irrigation. Root density was determined by Newman method for different soil depths.
Results highlight a greater root density in flooded crop in comparison to sprinkler irrigation.
The higher yield obtained with sprinkler irrigation, even higher than flooding irrigation, suggest a greater efficiency of the root system in water and nutrient uptake in oxidized environment
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