Advice on practical methods include compaction of the supply furrow and lining with movable pipes. Spacing between the short furrows should be wide enough to prevent colapse of the ridges. Generally, furrows should not be spaced at less than 700mm, but 900mm is more typical. If you have experience with planting young trees, you will know that the best time for planting is a few weeks before the rainy season starts. Young trees usually develop deeper root systems if the soil is relatively dry and the water table is low.
Growth is then sturdier, and the trees are more drought-resistant.
The problem is to keep your trees alive in the dry period preceding the rains. Dig a planting hole about half a meter deep and wide and line it with a single layer of newspaper. Fill it with alternate layers of organic matter and soil. Each layer should be damped. Make four small holes with a hot needle in the bottom of the plastic bottle.