Even when the rice straw can no longer grow mushrooms, it finds a further use. Rice straw, like all other plant material, contains lignin, a compound that strengthens the plant. Most animals cannot digest lignin or the cellulose attached to it, making the nutrients unavailable. However, some fungi, like the rice straw mushroom, are able to synthesize the lignin, freeing up more nutrients and creating an excellent fertilizer in the process.
Danh can use this straw as mulch, return it to the rice field or compost it for use in the vegetable garden. Even the seemingly insignificant, exhausted straw has a use, and one less piece is lost.
The rain races towards us across the rice fields, shattering their calm surfaces and dripping from palm frond to palm frond before crashing to the ground. Danh takes shelter in the doorway of his house and watches. Farmers in the Mekong Delta, where water is as ubiquitous as rice, know that the rain is part of the cycle of the farm.
This rain will water the grass that will feed the cow whose manure will grow the worms that will feed the chickens that provide the eggs. This rain will fill the pond where the fish feed on what the goats do not digest. This rain will flood the rice fields that provide the straw where the mushrooms will grow.
And when the cycle is complete, it will all begin again.
http://www.heifer.org/site/c.edJRKQNiFiG/b.2877337/