In the late 1920s and early 1930s the Government introduce new measures to support domestic agriculture and farmers' income. Subsidies or price insurance schemes were created for sugar beet, wheat, cattle, dairy and sheep. The Agricultural Produce (Grading and Marketing) Act 1928 promoted the standardisation of grades and packaging and introduced the "National Mark", a trade mark denoting home-produced food of a defined quality for eggs, beef, apples and pears. The Agricultural Marketing Acts of 1931 and 1933 sought to organise farmers into co-operative marketing associations and created Marketing Boards for bacon, pigs, hops, milk and potatoes. The Import Duties Act 1932 introduced a tariff on most imports including fruit and vegetables and quotas on imports of bacon, ham and other meat products. In 1936 the tithe rent charge was abolished, compensation paid to the Church and the money recovered from farmers over a 60-year period. In 1937 a scheme was introduce to subsidise the spreading of lime on agricultural land to boost the fertility of the soil. The Minister of Agriculture was given powers to regulate the cultivation and management of land, end tenancies, even take possession of land, under the Emergency Powers (Defence) Act 1939. On 1 September 1939 many of these powers were delegated to County War Agricultural Executive Committees ("War Ags").