How to add spamicide field to custom page

I'm trying to add spamicide module to my custom defined register page. I enabled it for that site in settings. Now i have code like that:

<div class="field">
      <?php
        print drupal_render($form['spamicide']); // print the spamicide field
      ?>
    </div>

However that field is empty, i don't know what i'm doing wrong. I died the same thign for captcha module and it works fine. Any ideas? Btw form has field spamicide, that is what i get if i var_dump it:

array (size=10)
  '#element_validate' => 
    array (size=1)
      0 => string 'spamicide_validate' (length=18)
  '#post' => 
    array (size=0)
      empty
  '#programmed' => boolean false
  '#tree' => boolean false
  '#parents' => 
    array (size=1)
      0 => string 'spamicide' (length=9)
  '#array_parents' => 
    array (size=1)
      0 => string 'spamicide' (length=9)
  '#weight' => float 0.01
  '#processed' => boolean false
  '#defaults_loaded' => boolean true
  '#sorted' => boolean true