Figure 1.

Decline in maize grain yield with continuous cultivation with subsistence farming in the Machakos and Makueni districts of Kenya (redrawn from Singh et al., 2009).

 


Figure 2.

Effect of rainfall on maize grain yield under subsistence farming in the Machakos and Makueni districts of Kenya (redrawn from Singh et al., 2009).

 


Figure 3.

Response of wheat grown in Mandan, ND, to soil organic carbon pool at 30-cm depth for three rates of nitrogen application (redrawn from Bauer and Black, 1994).

 


Figure 4.

Effects of changes in soil organic carbon (ΔSOC) pool in the root zone on grain yield of wheat in Australia (redrawn and recalculated from Farquharson et al., 2003).

 


Figure 5.

Effects of soil organic carbon concentration in the root zone on agronomic production for a Russian Chernozem (recalculated and redrawn from Ganzhara, 1998).

 


Figure 6.

Effects of soil organic carbon concentration in the root zone on grain yield of maize grown in northeastern Thailand (redrawn from Petchawee and Chaitep, 1995).

 


Figure 7.

Changes in grain yields of sorghum and pigeonpea grown on Vertisols in central India under (a) traditional and improved systems of management, and (b) ratio of grain yield under improved to traditional systems of management (redrawn from Wani et al., 2008).

 


Figure 8.

Managing soil properties and processes for enhancing eco-efficiency in production systems.