Relationship between SPAD value and grain yield can be affected by cultivar, environment and soil nitrogen content in wheat

SPAD-502 (Minolta Ltd, Osaka Japan), a hand-held chlorophyll meter is widely used in the synchronization of N supply with actual crop demand, however it is also known, that genotype and environment may effect SPAD value. Consequently, the aim of this study was to evaluate the genetic and environmental variation in SPAD value and to determine the relationship between SPAD value at heading (GS 59) and grain yield. Field experiments were conducted...