  Using hadronic Lagrangians that include the interaction of pentaquark
$\Theta^+$ baryon with $K$ and $N$, we evaluate the cross sections for its
production from meson-proton, proton-proton, and photon-proton reactions near
threshold. With empirical coupling constants and form factors, the predicted
cross sections are about 1.5 mb in kaon-proton reactions, 0.1 mb in rho-nucleon
reactions, 0.05 mb in pion-nucleon reactions, 20 $\mu$b in proton-proton
reactions, and 40 nb in photon-proton reactions.
