World trade talks have failed to agree on a firm date for ending export subsidies for agriculture, the draft summit declaration in Hong Kong shows.
Protesters had pledged to escalate action on Saturday
The US and developing states wanted a 2010 end date, but the EU objected until it saw movement in other areas.
The commitment to open up service markets stays in the draft, despite complaints from some developing states.
Outside the conference venue, hundreds of protesters led by South Korean farmers clashed with police.
Running battles broke out as demonstrators approached the centre in what correspondents said were the most violent demonstrations since the beginning of the talks five days ago.
Protesters stormed police lines as riot officers used tear gas, pepper spray, batons and fire hoses to try to push them back.
The Korean farmers - who are among the most heavily subsidised in the world - had vowed to step up action on Saturday.
The talks are due to end on Sunday, but some delegates from the 149 states have threatened to walk out if their concerns are not addressed.
Brazil has said it does not think trade talks will be able to take the process much further, and has pledged to renew its call for a summit of world leaders.
"There is a need to inject political energy into the negotiations," Foreign Minister Celso Amorim said, following the release of the draft text.
Many developing countries feel they are being pressed too hard to allow foreign competition in service industries.
KEY TRADE FLASHPOINTS
Cotton: African cotton producers say huge US subsidies distort trade but the US says it will only agree a deal on cotton as part of wider settlement on agriculture
Bananas: EU preferences to banana producers in former Caribbean colonies were ruled illegal by the WTO and Latin American countries say tariffs are too high
Food Aid: The EU says that all food aid should be given in cash and that US grain shipments to developing countries distort the market. The US believes food aid in kind is vital in famine relief
And some are also likely to be disappointed by the lack of progress on a plan to give duty-free and quota-free access to exports for the world's least-developed states.
Relief agencies criticised the draft.
ActionAid called it a "a disgrace and an insult to poor people all over the world".
The EU has objected to fixing an end date for export subsidies for agriculture because it is the main user - and wants to ensure that there are new rules to prevent other practices such as food aid being used for commercial purposes.
The draft suggested a date of 2010 for the elimination of the subsidies, or within a period of five years. But both suggestions were inside brackets, meaning neither may be adopted in the end.
Some African countries have been seeking the elimination of subsidies for rich-country cotton farmers.
The draft stops short of that, suggesting instead that they should be cut further and more quickly than for other farm products.
But the draft text asks rich states to scrap export subsidies for cotton by 2006, to help West African producers.
However, the EU has none and the US is already in the process of eliminating its main cotton export supports.
Should negotiators fail to even agree a minimal pact on trade at the discussions such a development could deal a severe blow to the credibility of the WTO, correspondents say.