The regional council said given the work involved, including requirements to provide financial and other supporting data, it was expected that entries wouldn't come in until nearer the closing date.
Rotorua Te Arawa Lakes Programme staff had fielded several calls from representatives of organisations including universities, private companies and industry bodies.
Entries for the challenge are now open and must show how the proposed land use solution provides for long-term, measurable nitrogen reductions and provide financial data detailing its economic viability.
While the challenge is expected to appeal largely to researchers, scientists and the farming and land management sectors, it is open to anyone to enter and the overall winner will receive $20,000.
All viable solutions submitted will be shared with landowners and the community to review and to potentially implement.
For entry details and information about the Rotorua Land Innovation Challenge go to www.rotorualakes.co.nz