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良种选育与良种推广经历了四个阶段，其扩散趋势呈由小到大再变小的偏峰分布。对７４种水稻良种研究表明：品种的生育期、产量水平、抗病性、株高等特征决定品种的最大扩散面积与经济寿命。
技术扩散的内在动因
【摘 要】
：
良种选育与良种推广经历了四个阶段，其扩散趋势呈由小到大再变小的偏峰分布。对７４种水稻良种研究表明：品种的生育期、产量水平、抗病性、株高等特征决定品种的最大扩散面积与经济
【出 处】
：
农业技术经济
【发表日期】
：
1994年4期
【基金项目】
：
InternationalDevelopmentCentre，InternationalRiceRe
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