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\hypersetup{pdftitle={Proposal of Functions of Transference of Physic - Mechanic Characteristics of the Soil for Precision Farming},pdfauthor={Fernando Lozano Osorno, Bernardo Castillo H.},pdfsubject={Tropentag 2016: Abstract},pdfkeywords={Pedotransference functions, precision farming, soil mechanics, soil physics},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 18-21, 2016, Vienna, Austria}}\\[1ex] \Large{``Solidarity in a competing world ---\\fair use of resources''\\[2ex]}}
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\begin{center}
\Large{\textbf{Proposal of Functions of Transference of Physic - Mechanic Characteristics of the Soil for Precision Farming\footnote{\textbf{Contact Address:} Fernando Lozano Osorno, National University of Colombia, Agricultrual Engineering,  Carrera 45 N° 26-85 Edificio Uriel Gutierrez, Bogotá, Colombia, \mbox{e-mail}: \email{flozanoo@unal.edu.co}}\\[0.8ex]}}
\normalsize{\textsc{Fernando Lozano Osorno$^{1}$, Bernardo Castillo H.$^{2}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$National University of Colombia, Agricultrual Engineering, Colombia}}}
\item[]{\small{\textit{$^{2}$National University of Colombia, Agricultural Engineering, }}}
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\index[author]{Lozano Osorno, Fernando}
\index[author]{Castillo H., Bernardo}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
In tillage, machines and implements cause several levels of soil movement up to a certain depth, so that some of their physical, mechanical and hydraulic characteristics are affected and undergo certain evolution over time until the new planting. In order to establish functions of transference to implement technologies of precision farming, it is important to select some characteristics of easy measurement that reflect the value of the whole soil. With this aim, one experiment in a tropical soil of the Bogota Savanah, at \mbox{2600\,m}.osl. was developed, in which 6 treatments with different levels of movement of the soil were established, from the zero tillage by direct sowing, four intermediate levels of movement of the soil, including one treatment with chisels plough, up to one treatment with a totally pulverised soil. Later maize was sowed and the following characteristics were monitored up to the compilation: Bulk Density, Total Porosity, Distribution of Pores (Macroporosity) measured by the pressure method, Moisture Content, Moisture Retention, Hydraulic Conductivity, Resistance to the Penetration (Cone Index), Cohesion and angle of internal friction measured in the tests of Direct Shear, Unconfined Compression and with Vane Shear box - \textit{In~situ}. The soil was characterised by measuring, Specific Gravity, Chemical Analysis, Particle Size distribution and Atterberg Limits.



The analyses of correlation and ANOVAs demonstrated that the characteristics that better reflect the condition of the soil and his evolution due to the tillage are: Cone Index, Gravimetric Moisture Content, Bulk Density and Shear Resistance measured in Situ.  The analyses of correlation, under different equations, showed also that these characteristics are a good reflection of the rest of physical, mechanical and hydraulic properties, with which functions of transference to take decisions in precision tillage, can be proposed.



}

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\noindent \textbf{Keywords:} Pedotransference functions, precision farming, soil mechanics, soil physics
\index[key]{Pedotransference functions}
\index[key]{Precision farming}
\index[key]{Soil!mechanics}
\index[key]{Soil!physics}
\end{document}
