Sometimes I volunteer at an urban farm]=
What are some things you do when volunteering that is the practice of cultivation right? 
Urban farming is growing crop in the the urban areas. I help weed the areas, water them, and transplant the plants when needed. Mostly onions.
Do you do organic farming as well I prefer organic so much healthier? 
yes! I have found that natural herbs and other plants can help keep the bugs away. I don't use any chemicals. To keep the weeds down, we use bales of straw and newspaper. 
That is great a lot of countries and people are practicing organic foods and it is increased interest a lot. 
That's good. The less chemicals the better. I'm glad it is increasing and peaking interest around the world. Organic is the way to go. 
Do the farm you volunteer at sell food to whole markets I do alot of  shopping there for more fresh flavors, colors and sweeteners in my fruits and vegetables. 
Farmer's Markets are in our area in different towns 6 days a week. That's the only markets they sell in. They also donate the fresh food to our local schools.
Food desert
A food desert is an area that has limited access to affordable and nutritious food, in contrast with an area with higher access to supermarkets or vegetable shops with fresh foods, which is called a food oasis. The designation considers the type and quality of food available to the population, in addition to the accessibility of the food through the size and proximity of the food stores.
In 2010, the United States Department of Agriculture (USDA) reported that 23.5 million Americans live in "food deserts",
, intensive gardening can support an adult from as little as 100 square meters of land per person,
possibly requiring the use of organic farming and aeroponics. Some proven intensive, low-effort food-production systems include urban gardening (indoors and outdoors). Indoor cultivation may be set up using hydroponics, while outdoor cultivation may be done using permaculture, forest gardening, no-till farming, and do nothing farming.
Greenhouses are also sometimes included. Sometimes they are also outfitted with irrigation systems or heat sink-