Thank you very much for the quick responses.

In fact, I took the cilinder samples and measured the dry weight, but I
also measured the weight of the coarse fraction so I can subtract it from
the total and and get the density (without stones) dividing by the volume
of the cylinder, as it is common to give the density on that way. My
question was which of the two densities should I introduce in the soil
file, but I guess it is the total one (including stones).

Thank you again
Maria

2012/4/19 Jorge Batlle <[log in to unmask]>

> Soil bulk density is measured in undisturbed soil samples (ussually token
> by
> insertion of a cilinder of knwon volume, and dividing the dry weight of
> this
> soil content by the volume of the cylinder). This measurement can be
> related to
> total volume porosity if the real density of soil particles is measured
> also by
> picnometer method.
> If you separed coarse fragments >2 mm and fine fraction < 2 mmm, it means
> that
> you already disturbed your sample.
> I hope this help.
> Jorge Batlle
>
> > The bulk density of a soil, is the ratio between the mass and volume of a
> fraction of soil, the most important is that the volume fraction have
> included
> soil air. This is very important because in the porous part is where there
> is
> water movement and more movement of the roots becoming root penetration,
> among
> other things, like the movement of nutrients or nutrient uptake by the
> roots.
> >
> > -----Mensaje original-----
> > De: DSSAT - Crop Models and Applications [mailto:[log in to unmask]]
> En
> nombre de fyy0201
> > Enviado el: Jueves, 19 de Abril de 2012 08:15 a.m.
> > Para: [log in to unmask]
> > Asunto: 回复: Bulk density
> >
> > Dear colleage,
> > I am not familiar with the content mentioned by you.So I am sorry and
> can not
> help you.
> > Best regards,
> > Lily
> > 2012-04-19
> >
> >
> >
> > fyy0201
> >
> >
> >
> > 发件人：maria soldevilla
> > 发送时间：2012-04-19 21:10
> > 主题：Bulk density
> > 收件人："DSSAT"<[log in to unmask]>
> > æ �送：
> >
> > Dear colleages.
> >
> > I have a question and may be somebody can help me. The Bulk density
> coefficient ( SBDM ) in the soil file, is the soil density including coarse
> elements or without them? I'm not sure which density I should write.
> >
> > Thank you very much
> > Best regards
> > Maria
> >
> >
>