The use of mulch expertise in plantation agriculture might involve mulching all the vegetation or simply the harvest stays and root stocks. Among other issues, this involves plant preparation for the next crop. Over-exploitation and absence of crop-rotation depletes soil fertility and will increase soil erosion. These include indigenous and conventional peoples and populations, a lot of whom are peasants whose food sovereignty is decided by training agriculture in the forest, complemented by their use of a rich diversity of non-timber forest merchandise. The chapter discusses the meaning and value of the biological yield and harvest index of cereals in agronomic research and in cereal breeding. The relationship of organic yield, grain yield, and harvest index to each other and to different plant traits is discussed.