{{Donors including the US and the UK have pledged more than $600m (£360m; 440m euros) in aid to South Sudan at a conference in Norway.}}
The sum raised will go towards the target of $1.8bn the UN says is needed to help millions facing starvation.
UN humanitarian chief Valerie Amos says it is still possible to prevent a famine in the conflict-torn country.
More than a million people have fled their homes since fighting erupted in December.
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Thousands have now died in the crisis that started as a political dispute between President Salva Kiir and his sacked deputy Riek Machar, but escalated into ethnic violence.
The conflict has left people unable to farm and with little access to food, aid experts say.
Nearly four million people in South Sudan are now at risk of serious food insecurity, according to the UN.
The UN’s humanitarian co-ordinator, Valerie Amos, said there was still “a small window of opportunity” to avert a famine before the rainy season begins.
“The important thing is to be able to get seeds and so on to people who are in desperate need… so that they are able to plant,” Ms Amos said.
“We can prevent the famine if there is enough food available for next year, but if there is not, if people are not able to plant, if the herders are not able to move, then we will face a severe crisis.”
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