After affecting the prices of lamb, beef and even bread, the drought is affecting soybean production, with yields likely to be down at a time when demand is increasing.

A report by the payments platform Square confirms what coffee lovers probably already knew: If you like your coffee white, soy comes in at number two behind cows' milk.

Australian Oilseeds Federation chief executive Nick Goddard warned that domestic soybean processors were competing for a limited crop.

He said the rising cost of water had forced irrigators in the Riverina to abandon soybean production.

"Historically, until last summer, soybeans were grown in the Riverina. It's the first time in many years there are none in that region," Mr Goddard said.

With processors having to pay more for soybeans, it is expected the increased cost will eventually have to be pushed on to consumers.

While he said he had not been closely monitoring horticultural crops, Mr Goddard said it was possible vegetable prices would also be pushed up as the weather hots up.

Mr Goddard said the federation was also closely watching how the season affected canola crops.

He said while crops in the Riverina and other southern parts of NSW and Victoria were in reasonable position, that was not the cause in areas more heavily gripped by the drought.

"It does need a good soak, but we are in a better position than this time last year," Mr Goddard said.

Incidentally, Square says that while the latte is still the best-seller across the country, its popularity has actually dropped over recent years, with total cups sold decreasing from 43 per cent to 32 per cent.

Flat whites have remained steady this year but the much-loved cappuccino has made a resurgence, with sales jumping from 12 per cent to 19 per cent over the same period.

State-by-state data also showed the cappuccino overtaking the flat white as the preferred coffee in NSW this year.