What is a staple crop?
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It's a really important crop for a particular area.  It makes more sense in context, like in colonial days tobacco was a staple crop for chesapeake farmers because it grew well and made a big profit.  It's a staple crop because they were dependant on it as the only thing (instead of growing a little bit of everything).
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Pinpointing the absolute beginnings of agriculture is problematic because the transition away from purely hunter-gatherer societies, in some areas, began many thousands of years before the invention of writing. Maize was first domesticated from teosinte in the Americas around 3000-2700 BC. In these contexts lie the origins of the eight so-called founder crops of agriculture: firstly emmer and einkorn wheat, then hulled barley, peas, lentils, bitter vetch, chick peas and flax. These eight crops occur more or less simultaneously on PPNB sites in this region, although the consensus is that wheat was the first to be sown and harvested on a significant scale.
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supply meets demand.\n\nProduces staple prices
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Most food will do: cheese, bread, any sort of plant tissue
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Through donations of the citizens in the community and through donations of businesses in the area.  Donations of money are used to purchase staple items that are not obtained through direct donation or items that have a limited shelf life such as milk and bread.
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I'd say fibers.  You can either eat fibers supplement or eat grain rice, wholewheat bread or fiber rich fruits such as papaya.
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I live in middle TN. The primary crop grown here is corn.\n\nMy wife has lived in TN for many years and other crops include tomatoes, greens, peas, beans, and cotton.
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In the mid colonies..tobacco was the cash crop.
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wheat: http://www.blackthornarable.co.uk/photography/cereals/th_S80-01%20ear%20ripe%20claire.jpg\n\nBarley:  http://images.google.com/imgres?imgurl=http://www.gnb.ca/0316/imagesdestination/Barley/images/barley%25201%2520(english).jpg&imgrefurl=http://www.gnb.ca/0316/imagesdestination/Barley/pages/barley%25201%2520(english).htm&h=800&w=796&sz=179&tbnid=Vfo2VwNXLIVPfM:&tbnh=142&tbnw=141&hl=en&start=11&prev=/images%3Fq%3Dbarley%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG
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http://cookeinsurance.com/html/in_hail.htm\n\nhttp://www.canhail.com/\n\nhttp://www.state.mn.us/mn/externalDocs/Self-Certification_for_CROP_HAIL_-_Pilot_Program_052803020316_certcrophail.pdf#search='crop%20hail%20insurance'
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1.Avena coleoptil\n2.Mais coleoptil\n3.Festuca gr. rubra\n4.Yucca brevifolia\n5.Sorghum saccharatum (Sorgho)\n6. dicotyls Lepidium sativum (garden cress)\n7. Sinapis alba (mustard)
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grains such as cereals, pastas, breads, and rice.
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The medicinal crops are the crops grown commercially to yield the products medicinally use full.These products may be secondary metabolites of these plants or the whole plant or its parts may be used.E.G- Ferula narthex(asafoetida.)resin is medicinally useful.Santalum album(sandal wood)wood is useful.Aloe vera(aloe plant)Mucilage in the stem,leaves is usefull.
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cotton, tobacco, rice, indigo
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Corn\nSoybeans\nHogs\nCattle
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Why do you consider rice a staple food?  I almost never eat rice.  It's just not part of my diet, and I work out almost every day.\nYour "tummy will get bigger" if you overeat, no matter what the food is.
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Some magnetic feild is what I beleive causes crop cricles...\nsince all electronics cease to function in and over crop circles