我县地处长江北岸,大别山南麓;耕作制度以“一肥两稻”为主,利用红花草(紫云英)做早稻基肥,历年占早稻面积80%左右。但由于红花草在腐烂后,产生了大量的有机酸,同时逸放出沼气、硫化氢等有毒气体,在浸水的情况下,气体在土壤中不易排出,土壤呈浆糊状。致使栽下的水稻活棵后扎根不稳,加之有毒气体侵害稻根,往往出现水稻“坐棵”,即较长时期内不 My county is located in the northern bank of the Yangtze River, south of the Dabie Mountains; farming system to “a fat two rice”, the use of safflower grass (aspen) to do early rice basal fertilizer, over the years accounted for about 80% of the area of ​​early rice. However, after the safflower grass decays, a large amount of organic acids are produced, meanwhile, toxic gases such as methane and hydrogen sulfide are released. In the case of flooding, the gas is not easily discharged in the soil and the soil is in the form of paste. Resulting in planted rice live after root instability, combined with toxic gas invasion of rice roots, rice often “sit tree”, that is, a longer period of time