南通县通海区集体耕地面积近17万亩,是个薄荷集中产区,年产量约占全国十分之一。该区历史上以旱作为主,1969年开始,推广麦—玉米—后季稻为主要形式的粮食三熟制。薄荷一年两刀,头刀于7月上中旬收割吊油,二刀在10月中旬收割吊油。1976年起,开始进行耕作制度改革,即扩大头刀薄荷面积,在头刀收割后,部分改种后季稻,这种形式简称夏扩秋改,当年秋改稻面积15,700亩,1980年45,500亩,1982年40,000亩(因秋 Tonghai District, Nantong County, nearly 170,000 mu of collective land, is a peppermint plantation, annual output accounts for about one-tenth of the country. The history of the region to dry as the main, since 1969, the promotion of wheat - corn - the latter part of the main form of rice grain three cooked. Mint two knives a year, head knife in mid-harvest in July hanging oil, two knives in mid-October harvest hanging oil. Since 1976, farming system reform has been started, namely expanding the head peppermint area. After the head knife has been harvested, part of the crop is replanted with rice. This form is abbreviated as summer expansion and autumn reform. In that year, the area under autumn rice reform was 15,700 mu, 45,500 mu in 1980, 40,000 acres in 1982 (due to autumn