Examining physical environment in terms of plant response: what role does variablelattribute play in controlling either 1. The distribution through space and time and/or 2. The availability to plants of: temperature radiation water nutrientsExamining physical environment in terms of plant response: what role does variable/attribute play in controlling either: 1. The distribution through space and time and/or 2. The availability to plants of: - temperature - radiation - water - nutrients