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据各地密度试验和生产实践证明:郑单二号玉米在500—600斤产量水平的条件下,以3000—3500株为宜;在700—800斤产量水平条件下,以3500—4000株为宜,在1000斤左右产量水平条件下,以4000—4500株为宜;育苗移栽可增加到5000株。目前大面积生产的密度偏稀一般2500株,有些社队只有2000株,甚至更少,大大影响了郑单二号的增产作用。一、密度试验结果汇总在500—600斤产量水平条件下,据四处试验结果,以每亩3300株产量最高,亩产620.4斤;每亩3000株、3500株的单产
According to the density test and production practice, it has been proved that Zhengdan No. 2 maize is suitable for 3000-3500 plants at the yield level of 500-600 kg, while 3500-4000 plants are suitable under the production level of 700-800 kg , In about 1000 pounds output level conditions, to 4000-4500 appropriate; seedling transplanting can be increased to 5000. At present, the density of large-scale production is generally thinner than 2500, with some commune teams having only 2000 or fewer, which greatly affected the yield increase of Zheng Dan II. First, the density test results summary 500-600 pounds output level conditions, according to the results of four tests, the highest yield per acre 3300, yield 620.4 kg; 3000 acres per acre, 3500 plant yield