1,720,969 research outputs found
Correlazione fra la frazione estraibile in acqua, la stabilità e la maturità del compost.
No full textLa frazione estraibile in acqua (WEF) di campioni di compost a base di pastazzo, scarti di potatura e scarti di IV gamma è stata analizzata e correlata con la stabilità e la maturità del compost. Molti dei parametri della WEF, della stabilità e maturità del compost sono risultati correlati con il tempo di compostaggio. La correlazione tra WEF e stabilità e maturità è risultata significativa in relazione al contenuto di composti organici biodisponibili e del grado di aromaticità dei fenoli solubili. Se questi risultati saranno confermati dallo studio della WEF di altri compost, sarà possibile individuare dei valori di soglia per stimare la stabilità e la maturità del compost con tecniche analitiche più rapide e più economiche di quelle oggi utilizzate
An expert system for rationalizing the fertilization of citrus orchards in order to avoid enviromental pollution
No full text
Effects of organic fertilisation on ‘Valencia late’ orange bearing trees
No full textIn a study realised over a three year period on orange bearing trees (Citrus sinensis (L.) Osbeck) ‘Valencia late’, grafted on sour orange (C. aurantium L.), the effect of organic fertilisers (OF) on plant nutrition and performance was verified. In a randomized block experimental design, four treatments were compared, namely: mineral fertiliser (MF) treatment adopted as control, citrus byproduct compost (CB), poultry manure (PM) and livestock waste compost (LW). The trees, with the exception
of (MF) treatment, were organically grown since 1994 in the experimental farm of
CRA-ACM in Lentini, Sicily, and received the same N input every year. Significant differences for micronutrients (Fe, Mn, Zn) were noticed in leaf analyses, whereas no difference was found between treatments for leaf macronutrient content. The δ15N detected in leaves, proteins of pulp and amino acids of juice showed the lower level in MF, an intermediate value in CB and the highest level in animal derived fertilisers treatments (PM and LW). Fruit of the CB treatment showed values of total soluble solids and total acidity significantly lower than other treatments. Orange peel Chroma C* in CB and MF was higher than in PM and LW treatments. Discriminant analysis of the leaf and fruit analytical data set successfully separated treatments. First discriminant canonical function explains the 96,9% of the variability, with highly significant Wilks’ lambda. Cross validation classified correctly all MF and CB samples, whereas PM and LW in few cases were mixed up
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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