Environment Secretary Steve Reed has been forced to face farmers' fury as he delivered his speech to the National Farmers' Union.
Reed, who was met by muted delegates, was introduced by NFU president Tom Bradshaw.
However, Labour's decision to raid farmers' pockets by ending the inheritance tax exemption has sparked a backlash from the agricultural sector.
Speaking in London as protesters held banners aloft, Reed said: "I can't give the answer I know many of you want on inheritance tax but I want you to know that I understand the strength of feeling in the room and in the sector - we can see an example of that right in front of me now.
"And I am sorry that it's a decision we have had to take. I'm always going to turn up to have the conversation with. There's an opportunity to ask questions afterwards and it might be better to ask them that way."
The group of protesters were forced to lower their banners and ushered away from the main stage.
The incident came just minutes after Bradshaw told the annual conference that the inheritance tax changes were "morally wrong and economically flawed".
Rachel Reeves's decision will see inherited agricultural assets worth more than £1million face a 20 per cent inheritance tax levy, having previously been exempt from the duty.
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The Government had estimated that the changes would only impact the wealthiest 500 farms each year.
However, the NFU's own estimates put the figure up to 70,000.
Bradshaw told delegates: "We will fight this family farm tax until ministers do the right thing.
"Frankly, this Government needs a reset moment with farming, where they face up to the reality of how much the industry is struggling."
Protesters demonstrated inside the conference hall
PA
Shortly before Reed's appearance at the NFU's annual conference, Shadow Environment Secretary Victoria Atkins reiterated the Tories remain committed to scrapping the levy.
Speaking to GB News, Atkins said: "This Labour Government have ripped the rug out from farmers and family businesses feet by imposing this family farm tax, this death tax on family businesses, which means that in a meeting that I called yesterday with the three main farming organisations, they were telling me very clearly that it is having a huge impact on their members plans for the future, people are stopping investing in agricultural machinery and buildings and so on."
She added: "We as Conservatives have promised that when we're back in Government, we will reverse this terrible, terrible tax because we understand and we care about the terrible impact it's having on our countryside and on our family businesses."
Reform UK and the Liberal Democrats have also voiced opposition to the so-called tractor tax.
