In 1999, all five high plants per acre spacings (treatments B through F) out-yielded the low plant per acre spacings by and average of 17%. 

Dr. Morse also points out that the more equidistant spacings (B and D) out-yielded a regular spacing of 8 x 2 by an average of 117% even though there were other treatments that had equal of higher plant populations. 

The data indicates that both plant population and arrangement of plants can affect pumpkin yield. 

In another study, Dr. Morse's research focused on nitrogen applications.

Studies revealed that there was no significant difference in yield between the 201 lbs. and 401 lbs. rates. 

However sidedressing of N did increase marketable pumpkin yield by 30% as opposed to no N applied.

Excessive rates of N can result in decreased marketable pumpkins produced per acre, principally due to decreased fruit set and enhanced fruit rot.