Mulberry leaves are the sole source
of nutrition for growing silkworms. They take water, protein,
carbohydrates, fat, anorganic salts and vitamins from these leaves.
If the silk producer
is planning for a moderate (20,000 worm) silkworm harvest,
s/he will plant around 2,000 cuttings and tend them for 8 months
to a year before
starting to raise silkworms. A producer must have 500-600 kg
of leaves to feed 20,000 worms through their life cycle.
The trees are grown from 20-25 cm branch
cuttings, which are carefully placed in the ground with organic compost.
In order to keep the soil healthy, legume grass can also be planted around
the cuttings. This prevents soil erosion, and adds nutrient-rich biomass
to the topsoil. As the trees grow, they are constantly pruned in order
to increase crop yield and keep the tree at a convenient height for harvesting.
The growing of mulberry trees is a
sustainable and rewarding option for the Lao village farmer. It provides
a sustainable alternative to both the customary practice of slash and
burn agriculture (which has caused extensive deforestation and severe
soil degradation) and the prevalent cash crop of opium poppies. When
raised correctly, a crop of mulberry trees can rejuvenate the earth,
prevent soil erosion, provide delicious mulberry fruit, and translate
into a worthwhile profit for the farmer.