"If you have read the green paper, you will realise the degree of racial aggression that it contains ... it is impossible to ignore," the foundation's executive director, Dave Steward, said at a conference organised by AfriForum in Pretoria.

"The inflammatory historic analysis is irreconcilable with the constitution's goal of healing the divisions of the past."

Steward said the green paper's characterisation of white farmers as colonialists came close to hate speech.

He said the statement in the green paper that "all anti-colonial struggles are, at the core, about two things: repossession of land lost through force or deceit, and restoring centrality of the indigenous culture", violated the values of equality and non-racialism.

Steward said the green paper would strongly affect commercial farming, domestic and foreign investment, and race relations.

He said 90% of the farms that had been transferred to blacks had failed.

"It is a reflection of the truth that successful farming requires a great deal of capital, a great deal of experience and training, and, often, a great deal of luck."