According to the FAO statistics for 2010, the ten most important crops were:
By economical value:
Rice ($175B, 672,016BT)
Wheat ($81B, 650,881BT)
Soybeans ($65B, 261,578BT)
Corn ($55B, 844,405BT)
Sugar cane ($54B, 1,685,445BT)
Tomatoes ($53B, 145,752BT)
Potatoes ($44B, 324,182BT)
Vegetables ($41B, 240,115BT)
Grapes ($39B, 68,331BT)
Cotton ($34B, 23,488BT)
By weight:
Sugar cane ($54B, 1,685,445BT)
Corn ($55B, 844,405BT)
Rice ($175B, 672,016BT)
Wheat ($81B, 650,881BT)
Potatoes ($44B, 324,182BT)
Soybeans ($65B, 261,578BT)
Vegetables ($41B, 240,115BT)
Cassava ($22B, 229,541BT)
Sugar beet ($9B, 228,452BT)
Tomatoes ($53B, 145,752BT)
Without crops, there is no agriculture.
The science of growing crops is agriculture; I wouldn't call it an art.
Agriculture is the science of farming crops. If you grow crops, even if not for commercial purposes, I'd call this agriculture.
Agriculture is not a person, it is an activity, specifically, growing crops.
Commercial Agriculture
The general term for agriculture involving growing crops is tillage.
sugarcane..
Crops and livestock.
You need to specify percentage as a function of something. Examples: Percentage of total land being used for agriculture, percentage of GDP produced by agriculture, percentage of population involved with agriculture, percentage of crops which are field crops as opposed to orchard or nursery crops, etc.
crops, fisheries, animal breedings and forestry
agriculture is farming and the methods that ere used to raise and look after crops and animals
Everything. Dairy is a part of agriculture, just like crops or ranching or raising alpacas is a part of agriculture.