>
> Try this:
>
>   #+name: gharsondi-yield
>   #+caption: Average yields of selected crops in Gharsondi, Gwalior,
> Madhya Pradesh and India, 2007-08 (kilograms per acre)
>   #+attr_latex: :options [htb]
>   #+begin_table
>   #+begin_threeparttable
>

Thanks Nicolas.

I need #+attr_latex to come after #begin_threeparttable. Otherwise, it is
not used.

The following works:

#+NAME: gharsondi-yield
#+CAPTION: Average yields of selected crops in Gharsondi, Gwalior, Madhya
Pradesh and India, 2007-08 (kilograms per acre)
#+begin_table
#+begin_threeparttable
#+attr_latex: :environment tabularx :width \textwidth :align lrrrr
#+RESULTS: gharsondi-yield-in
| Crop      | Gharsondi | Gwalior | Madhya Pradesh | India |
|-----------+-----------+---------+----------------+-------|
| Soybean   |       nil |     689 |            442 |   500 |
| Paddy     |      1553 |     866 |            569 |  1337 |
| Urad      |        53 |     142 |            142 |   192 |
| Sesame    |       101 |     127 |            153 |   170 |
| Wheat     |       824 |     664 |            652 |  1134 |
| Chick pea |       462 |     445 |            288 |   308 |
| Rapeseed  |       501 |     280 |            375 |   405 |
#+begin_tablenotes
\footnotesize Source: Data for Gwalior, Madhya Pradesh and
India taken from the website Directorate of Economics and Statistics,
Ministry of Agriculture, Government of India. Yield of rice were
converted to paddy equivalents.
#+end_tablenotes
#+end_threeparttable
#+end_table


Vikas