Domenico Ditto

University of Milan | UNIMI · Department of Agricultural and Environmental Sciences - Production, Landscape, Agroenergy

Copyrigh (c) 2014, Intersezioni, ISSN 2280-689X. Editor by Ordine dei dottori agronomi e dei dottori forestali di Milano. Via G. Pacini 13, 20131 Milano (http://www.intersezioni.eu/index.php).

The present short communication contains a scientific dispute about the historic role of Wave Mechanics closely reminding a famous Galilean dialogue between supporters and opposers of tradition.

De Broglie's quest for a wave-like approach capable of representing the position of moving particles is satisfied by assuming that they run along the trajectories associated, under assigned starting conditions, with a time-independent Schrödinger equation. Just like in Classical Mechanics, the starting conditions determine a set of virtual trajecto...

We studied cover crops in maize-based cropping systems in the agricultural plain areas of Northern Italy (Lombardia region), to: quantify the growth of winter cover crops, nitrogen uptake, weed control capacity, and nitrogen credits for maize; to test the possibility of sensing cover crop biomass and nitrogen (N) concentration using aerial images,...

The book "IMPIEGO DELLE COVER CROP NELLA COLTIVAZIONE DEL MAIS" can be download for free from this URL: http://sites.unimi.it/cocrop/wp-content/uploads/Presentazioni/19R0058p01_COCROP_final_lRes.pdf

De Broglie's problem: can a particle have a permanent localization in space? is solved in terms of the general properties of Helmholtz-like equations, within the standard frame of de Broglie's and Schrodinger's Wave Mechanics, avoiding any further hypothesis.

Both classical and wave-mechanical monochromatic waves may be treated in terms of exact ray-trajectories (encoded in the structure itself of Helmholtz-like equations) whose mutual coupling is the one and only cause of any diffraction and interference process. In the case of Wave Mechanics, de Broglie’s merging of Maupertuis’s and Fermat’s principle...

The “main road” open by de Broglie’s and Schrödinger’s discovery of matter waves and of their eigen-functions branched off, as is well known, into different “sub-routes”. The most widely accepted one is Standard Quantum Mechanics (SQM), interpreting the time-dependent Schrödinger equation as the basic evolution law of a wave-packet which represents...

Integrating soil and crop sensing methods to support nitrogen fertilization on wheat and barley

One of the major causes of land degradation and loss of fertility is the soil erosion due to water runoff. In Italy, the 77% of the territory is estimated to be threatened by accelerated erosion, because of both its natural structure and anthropic action. This leads to the need of developing modelling tools able to provide useful information for ru...

Contrary to a wide-spread commonplace, an exact, ray-based treatment holding for any kind of monochromatic wave-like features (such as diffraction and interference) is provided by the structure itself of the Helmholtz equation. This observation allows to dispel - in apparent violation of the Uncertainty Principle - another commonplace, forbidding a...

The time-independent Schroedinger and Klein-Gordon equations - as well as any other Helmholtz-like equation - turn out to be associated with exact sets of Hamiltonian ray-trajectories (coupled by a "Wave Potential" function, encoded in their structure itself) describing any kind of wave-like features, such as diffraction and interference. This prop...

An exact, ray-based Hamiltonian treatment is shown to hold for any kind of monochromatic waves, under the ray-coupling rule of a "Wave Potential" function encoded in the structure itself of Helmholtz-like equations. Since the time-independent Schroedinger and Klein-Gordon equations (associating stationary "de Broglie's waves" to mono-energetic part...

The behavior of classical monochromatic waves in sta- tionary media is shown to be ruled by a novel, frequency-dependent function which we call Wave Potential, and which we show to be enco- ded in the structure of the Helmholtz equation. An exact, Hamiltonian, ray-based kinematical treatment, reducing to the usual eikonal approxi- mation in the abs...

L'evoluzione del nostro pensiero scientifico è stata, per 3000 anni, avventurosa e affascinante, ma non bizzarra. Il suo procedere ha avuto una logica sequenziale, pur con taluni ristagni ed arresti, che ci permette di ricostruirne i dettagli e le motivazioni. Bizzarra, invece, tale evoluzione è diventata nell'ultimo secolo, specie nell'ambito dell...

The behavior of monochromatic electromagnetic waves in stationary media is shown to be ruled by a frequency dependent function, which we call Wave Potential, encoded in the structure of the Helmholtz equation. Contrary to the common belief that the very concept of "ray trajectory" is reserved to the eikonal approximation, a general and exact ray-ba...

The behavior of classical monochromatic waves in stationary media is shown to be ruled by a novel, frequency-dependent function which we call Wave Potential, and which we show to be encoded in the structure of the Helmholtz equation. An exact, Hamiltonian, ray-based kinematical treatment, reducing to the usual eikonal approximation in the absence o...

The analysis of the Helmholtz equation is shown to lead to an exact Hamiltonian system describing in terms of ray trajectories a very wide family of wave-like phenomena (including diffraction and interference) containing the eikonal approximation as a simple limiting case. Since, moreover, the time independent Schr¨odinger equation is itself a Helm...

With an apparent delay of over one century with respect to the development of standard Analytical Mechanics, but still in fully classical terms, the behavior of classical monochromatic wave beams in stationary media is shown to be ruled by a dispersive "Wave Potential" function, encoded in the structure of the Helmholtz equation. An exact, ray-base...

The behavior of classical and quantum wave beams in stationary media is shown to be ruled by a "Wave Potential" function encoded in Helmholtz-like equations, determined by the structure itself of the beam and taking, in the quantum case, the form of Bohm's "Quantum Potential", which is therefore not so much a "quantum" as a "wave" property. Exact,...

In anni recenti si è assistito a una rapida evoluzione nei metodi di analisi funzionale della crescita e dello sviluppo di specie erbacee. L’analisi funzionale della crescita si basa su soluzioni analitiche di equazioni differenziali che descrivono possibili modalità di crescita di un organismo o di una popolazione. Il presente lavoro, che viene p...

We propose a critical review of the so-called functional approaches to the main mathematical models of crop growth analysis, following their development in terms of increasing complexity and flexibility with respect to the representation of experimental data. Each differential equation is analytically solved, defining moreover the main characterist...

Although existing simulation tools can be used to study the impact of agricultural management on production activities in specific environments, they suffer from several limitations. They are largely specialized for specific production activities: arable crops/cropping systems, grassland, orchards, agro-forestry, livestock etc. Also, they often hav...

The analysis of the Helmholtz equation is shown to lead to an exact Hamiltonian system of equations describing in terms of ray trajectories a very wide family of wave-like phenomena (including diffraction and interference) going much beyond the limits of the ordinary geometrical optics approximation, which is contained as a simple limiting case. Du...

The indeterministic character of physical laws is generally considered to be the most important consequence of quantum physics. A deterministic point of view, however, together with the possibility of well defined Hamiltonian trajectories, emerges as the most natural one from the analysis of the time-independent Helmholtz-like equations encountered...

The indeterministic character of physical laws is generally considered to be the most important consequence of quantum physics. A deterministic point of view, however, together with the possibility of well defined Hamiltonian trajectories, emerges as the most natural one from the analysis of the time-independent Helmholtz-like equations encountered...

Weeds strongly influence rice yields. Among the worst ones we can find the Echinochloa spp, which counts about 50 different species, six of which can be often found in Italian ricefields: Echinochloa colonum, Echinochloa crus-galli, Echinochloa crus-pavonis, Echinochloa erecta, Echinochloa hostii, Echinochloa phyllopogon. Each species is characteri...

RESULTS AND DISCUSSION The observation of the images and CP profiles of the Loto cultivar did not revealed any substantial difference from the chromosomal characteristics of the four weedy red rice biotypes considered. However, in the present work, analyses of 10 prometaphasic karyotypes for each biotype, confirmed the existence of translocations,...

The aim of this work has been the study of the growth rate of three different species of Echinochloa (E. crus-galli, E. erecta and E. hostii), raised in appropriate non-competitive experimental conditions, as far as it concerns light, water and nourishment. On this purpose, the seeds of these three species have been placed in small peat pots for ge...

We present C-GAM (Crop Growth Analysis Model), a user-friendly software tool for dealing the basic mathematical functions and statistics required for crop growth analysis, adopting both "classical" and "functional" approach. C-GAM, written in a modern Object-Oriented Programming language (OOP), allow fitting a wide range of growth curves frequently...

red rice

growth analysis

Metam-sodium is a soil fumigant with herbicidal properties. A field experiment was conducted in 2000 at Copiano (Pavia, Italy) to determine the efficacy of three rates of metam-sodium (300, 450 and 600 l/ha) at three different planting times (5, 12 and 18 days after chemical treatments) for the control of weeds in rice cultivation. The study mainly...

Note to "Modelli per Sistemi Produttivi in Agricoltura", Progetto SIPEAA, CRA-ISCI Bologna (Italia). The Book is available from ISCI at the web site: www.isci.it/sipeaa/home.html. Donwload PDF is available at the link: www.isci.it/sipeaa/Convegno_SIPEAA_finale/Volume_SIPEAA.pdf.

modelling erosion

The infesting habit of the red rice (Oryza sativa subsp. japonica var. sylvatica, 2n=24) and its diffusion has become a serious problem in rice cultivation because of seed shattering which reduces rice yield and grain quality. The purpose of this work is to characterize red rice chromosomes and to reveal any differences from the karyotype of cultiv...

Metam-sodio is a fungicide used for geosterilization, which show a certain herbicidal properties. Field experiment was conducted in 2000 at Copiano (Pavia, Italy) to determine the effects of three rates of Metam-sodio (300, 450 and 600 kg ha-1) and three planting time (5, 12 and 18 days after chemical treatments) on weed rice control. Test design w...