Effects of gypsum and legumes on soil pH and soil organic C - Exp 2

To examine the effect of gypsum on soil pH and soil C and whether changes in soil pH could alter productivity of the following cereal crops.本研究旨在探究石膏（gypsum）对土壤pH值与土壤碳（soil C）的影响，以及土壤pH值变化是否会改变后续谷类作物的生产力。