A number of farmers on the Shoalhaven floodplain, east of Nowra, have started removing this year's crops.

John Henry, of John, Andrea and Ryan Henry Contractors, said it's shaping up to be a "huge season", with what have so far been "great growing conditions".

"It's a huge season, easily one of the best we've had in a long time," he said.

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"For those not on irrigation we've had enough rain at the right times.

"It's a bumper season."

Although he did say they weren't looking for too much rain during the harvest time, which would make paddocks boggy and hard to remove the crops.

Mr Henry estimates on average this year's harvest will yield 25-28 tonnes per acre.

"Some of the crops do look better than others, I'd expect to average around 25-28 tonnes of wet matter this year," he said.

"On unirrigated land last year we were only averaging about 12-14 tonnes per acre.

"Some of the areas that are irrigated under the REMS (Shoalhaven Water's Reclaimed Water Management Scheme), with the ideal growing conditions I expect 30 plus tonnes per acre.

"But unfortunately not all farms are on that. But even so the harvest will be good.

"The drought conditions last year were tough on those who weren't on irrigation - the difference this year is the better rainfall we've had.

"There is that much corn in it's going to be a busy time."

Mr Henry, who plants and harvests corn from Camden down through the Shoalhaven, estimates he won't be finished harvesting until May possibly June.

"That's a lot later than normal," he said.

"But that could also be a good thing for us because it will allow us time to get from farm to farm - you can't harvest all the time."

He estimates there is around 2200 acres (around 850-890 hectares) of corn to be harvested.

"We are in for a busy few months that's for sure."

Another battle this year has been Fall Armyworm, which has been found on some South Coast corn crops.

"We purchased a RoGator self propelled spray unit to help tackle the problem," Mr Henry said.

"A lot of local farmers have been utilising it to spray for the armyworm.

"They [armyworms] have been knocking some crops around but we've been trying to stay on top of it as much as we can.

"We can spray crops from germination through to seven feet high."

The machine can cover up to 30 metres in one pass, with its wheels capable of being narrowed or widened to allow it to be easily driven between rows, without damaging the crops.

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