Estimating nutrient uptake requirements for wheat in China

► To analyze characteristics of grain yield, nutrient uptake, fertilizer application and internal efficiency for wheat in China from the year 2000 to 2011. ► To determine envelop functions of maximum accumulation, maximum dilution boundaries and the optimal N, P and K uptake. ► To evaluate the relationship between grain yield and N, P and K accumulation in total above-ground plant dry matter in China.