辽宁省属于寒带稻区。全年无霜期110～170天,雨量500～1,000公厘,降雨量多集中于七、八两月,占年雨量的三分之二,因而春季播种常有缺水现象,影响水稻适期播种。夏季干燥高温,昼夜温差较大,有利水稻生长发育,但春秋两季常受低温侵袭,常发生烂秧及苗绵腐病。8月上、中旬水稻出穗期前 Liaoning Province is a temperate zone with rice. Annual frost-free period of 110 to 170 days, rainfall 500 to 1,000 mm, rainfall concentrated in July and August two, accounting for two-thirds of annual rainfall, so the spring often lack of water sowing, affecting rice sowing. Summer dry high temperature, large temperature difference between day and night, favorable growth and development of rice, but spring and autumn are often affected by low temperature, often rotten seedlings and Miao Mian rot. August, mid-paddy before heading