Vietnam’s coffee exports in March are estimated to fall 28.8-33.5 percent from a year earlier to 140,000-150,000, traders said on Thursday, as activity in Indonesia remained muted this week.

“Sales are slowing due to low prices, while many buyers are turning to buy from Brazil, where prices are even lower partly due to the recent weakening of the real,” a Ho Chi Minh City-based trader said.

Customs data released earlier this month showed Vietnam’s coffee shipments in the first half of March totalled 83,120 tonnes, compared with 99,585 tonnes in the same period last year. The government’s General Statistics Office is scheduled to release March coffee export data on Friday.

Farmers in the Central Highlands sold coffee at 32,000-33,100 dong ($1.38-$1.43) per kg on Thursday, narrowing from a range of 31,900-33,300 dong last week.

Globally, coffee growers are being forced into poverty by low international prices for the crop, farmers’ representatives said at an international conference in Bogota on Wednesday, warning the future of the industry is at risk.

Traders in Vietnam offered 5 percent black and broken grade 2 robusta at a $30-$50 per tonne discount to the July contract. They offered a $55-$60 discount to May contract last week.

Meanwhile, in Indonesia, activity remained muted this week on lacklustre demand from buyers, despite supplies from a mini harvest there.

Premium for the grade 4 defect 80 robusta was steady on last week at $70-$80 to the May contract on Thursday, a trader in Sumatra’s Lampung province said.

May robusta coffee settled down $6, or 0.4 percent, at $1,504 per tonne on Wednesday.