Landcorp also blamed a greater percentage of lower priced bulk sales of milk powder inventory for lowering overall margins and lower profitability for Focus Genetics Australia as a result of drought.
The company said these issues were partially offset by reducing discretionary expenditure while ensuring the business was well positioned for the next season.
The new, reduced forecast assumed there would be no further material adverse weather events, a significant strengthening of the New Zealand dollar or other material changes to market prices, the notice to Treasury said.
Landcorp, which operates 122 farms covering 376,000 hectares, for the 2018 financial year posted EBITDAR of $48.5m, compared to $35.6m the previous year.
However net profit after tax for 2018 was down on the previous year at $34.2m, against $51.9m in the 2017 year.
Landcorp's brand name is Pamu. It produces milk, including sheep milk, beef, lamb, vension, wool and wood.
Landcorp chairman Dr Warren Parker has been approached for comment.