水稻土的晒垡,经验早就证明具有碎土、对秧苗有早发的作用,但在苏南地区全面推广双三制以来,这一行之有效的措施,就往往被农时挤掉了,生产上为了弥补由于不晒垡而引起的土块大,不早发等缺陷,常采用多次机械作业碎土及多施种肥、 The experience of paddy soil drying up has proved that there is groundbreaking and early development of seedlings. However, since the promotion of Shuangsan system in southern Jiangsu, this effective measure has often been squeezed out during the production of agricultural products In order to make up because of non sun drying caused by large clods, do not hair and other defects, often using multiple mechanical operations soil and more fertilizer,