This article quantifies the productivity gain from CIMMYT-released semidwarf bread wheat ("Triticum aestivum") cultivars over time, using test plot data from Mexico's Yaqui Valley. Previous studies have shown a deceleration in irrigated wheat yield growth since the 1980s, which could be due to...

This study solves for the optimum replacement rate (ORR) and initial replacement year (IRY) of cocoa trees (Theobroma cacao) in Ghana to maximize net present value and achieve steady state by employing a phased replanting approach. The annual ORR is 5%–7% across the three production systems...