玉米双交种——农大七号是1959年引进宁夏试种的。它是北京农业大学杂交育成的双交种。其组合为38-11×金15/W24×W20。根据自治区王太堡农业试验场几年来试验结果,认为它有以下优点:1.丰产性强:经过1959、1960及1963年试验,三年平均亩产1,308.9斤,比当地群 Double crossbreed corn - Nongda seven is introduced in 1959 Ningxia trial planting. It is a cross breed that was bred by Beijing Agricultural University. The combination of 38-11 × gold 15 / W24 × W20. According to the test results of the Wangtaibao Agricultural Experimental Station in the autonomous region over the past few years, it has the following advantages: 1. High yield: After 1959, 1960 and 1963 tests, the average yield per mu in a three-year period was 1,308.9 kg,