Effect of copper and zinc on wheat on newly cleared sandy over grey or grey brown clay

To determine the rates of copper and zinc required for maximum grain yield of wheat grown on sandy surfaced over grey or grey domed clays.

本数据集旨在明确在覆于灰色或灰色穹状黏土之上的砂质表层土壤中种植的小麦，实现最高籽粒产量所需的铜与锌施用量。