A Joint‐Product Analysis of the Adoption of Modern Cereal Varieties in Developing Countries
分析半矮秆小麦品种在部分地区推广缓慢的原因，发现低投入条件下其秸秆产量低是重要因素，并探讨了品种对氮肥需求的影响。
Abstract Semi‐dwarf wheat varieties have been slow to diffuse in some regions despite their superior grain yield. We analyze varietal differences in yields of the joint products of grain and straw, the decision to adopt new varieties, and nitrogen demand. The low straw yield of semi‐dwarf varieties under low input conditions is shown to be a plausible explanation for their slow adoption in some regions. First generation modern varieties induced a large increase in the derived demand for nitrogen, but subsequent varietal development appears to have had little impact on nitrogen demand.