我们沟沿地区种植水稻有近五十年历史,七六年开始进行杂交制种小面积试验。制种组合:雷曼 A×C57—2,面积三十一亩五分,收杂种总量四千二百斤,单产一百三十三斤四两。C57—2总产量六千三百斤,平均亩产二百斤。制种田为中等肥力的老稻田,黑粘土。据分析0—20厘米耕层土壤含:全氮0.1031%、水解氮21.78毫克/100克土,速效磷3.04毫克/100克土,全钾2.47%速效钾7.80毫克/100克土,有机质1.731%,全盐 We trench cultivation of rice in the region for nearly 50 years of history, seven or six years of hybrid seed production small area test. Seed combination: Lehman A × C57-2, an area of ​​thirty-one acres fifth, the total income of 4,200 catties, a yield of 133 catties four two. C57-2 total output of 6,300 catties, the average yield of 200 catties. The system of farming for the middle fertility of the old rice fields, black clay. According to the analysis, 0-20 cm topsoil contains: 0.1031% of total nitrogen, 21.78 mg / 100 g of hydrolyzed nitrogen, 3.04 mg / 100 g of available phosphorus, 7.80 mg / 100 g of potassium, 7.31 mg of organic matter, , All salt