Annona Species Monograph.pdf - Crops for the Future

Chapter 10. Agronomy
wet season to attain the desired soil tillage. This operation will also expose
the soil seed bank in order to eliminate most of the undesirable weeds (Pinto
and Ramos, 1997).
Depending on the degree of slope, the grower can use one of three types of
planting systems: square (Fig. 10-7 A), rectangular or quincuncial (also
called triangular) (Fig. 10-7 B). In orchards with slopes greater than 3%, the
soil should be prepared along contour lines and the quincuncial system
should be used to minimize soil erosion (Figs. 10-8 A and 10-8 C). On the
other hand, flat land (with slopes less than 3%) does not need contour line
practices, and can use a square (Fig. 10-8 B) or rectangular planting system.
Nakasone and Paull (1998) suggest that minimal tillage can be achieved with
a 2 m wide cultivated band where the trees are to be planted.
Figure 10-7. Soursop planting systems: A) square and B) quincuncial.
Adapted from Torres and Sánchez (1992)
86