一、市场经济促使全国玉米种子市场的形成我国70年代杂交玉米的发展,使玉米产量有了突破性的提高,二十年时间,每亩产量从141公斤提高到308公斤,提高2.18倍。相继发展起来的杂交水稻、杂交高梁、杂交油菜对我国粮食和油料的产量提高起了很大作用。由于杂交种 First, the market economy to promote the formation of the national corn seed market The development of hybrid corn in the 1970s in China has led to a breakthrough in corn production. In two decades, the yield per mu was raised from 141 kg to 308 kg, an increase of 2.18 times. Successively developed hybrid rice, hybrid sorghum, hybrid rapeseed on China’s grain and oil production has played a significant role. Due to hybrids