前言科学——这个推动人类社会发展的车轮,正以每秒a的加速度飞快地向前奔驰。科学是无私的,各学科的发展只有相互渗透,相互促进,而不存在制约。水稻育种科学,受玉米、高粱育种的影响和启迪而迅速发展。作物杂种优势利用,是育种科学的一次飞跃。我国在50年代末开始应用玉米杂交种,60年代中期开始应用高粱杂交种,70年代中期育成水稻杂交种。作物育种科学的发展表明,异交作物的玉米育种比常异交作物的高粱发展得快,高粱育种又比自交作物的水稻发展 Foreword Science - the wheel that promotes the development of human society is rapidly moving forward at an acceleration of a second. Science is selfless, and the development of all disciplines only permeates each other and promotes each other without restriction. Rice breeding science, by the corn, sorghum breeding effects and enlightenment and rapid development. Crop heterosis utilization, breeding science is a leap forward. China began to apply maize hybrids in the late 1950s, sorghum hybrids in the mid-1960s, and rice hybrids in the mid-1970s. The development of crop breeding science shows that maize breeding of outcrop crops develops faster than sorghum often outcrossed, sorghum breeding is more developed than that of selfed rice