推广以单交种为主的玉米杂交种可提高玉米产量。但年年需要配制大量玉米单交种,制种产量低,种子成本高,种子供不应求。为了提高制种田产量,几年来我们作了制种不同间套方式试验,结果以玉米制种与大豆、豌豆间种,产量最高。如本场1976年晋单3号制种田采取这一方式后,每亩总产达到568.5斤,较对照每亩总产提高32.6%,玉米产种只减少2.5%。种植方式:玉米父、母本行比为1:2,父本行两侧各种一垅大豆,母本行之间种一垅豌豆,豌豆、大豆行比也为1:2(见图)。另外选用早熟矮秆的高产豆类良种是间作增产的关键。我们选用了北京1 Popularizing maize hybrids dominated by single crosses can increase maize production. But every year need to formulate a large number of maize single cross species, seed production is low, the cost of seeds is high, the seeds are in short supply. In order to improve the system of farming output, over the past few years we have made a different kind of seed production test, the results of corn seed and soybean, peas species, the highest yield. If this field 1976 Jindan 3 system of farming to take this approach, the total output per acre reached 568.5 kg, compared with the control output per acre increased 32.6%, corn production decreased by only 2.5%. Ways of planting: corn parent ratio of 1: 2, the father on both sides of a row of all kinds of soybeans, the mother of a line of peas, pea, soybean ratio of 1: 2 (see photo) . In addition the selection of precocious dwarf high-yielding legumes is intercropping production key. We chose Beijing 1