Exam 10: Food - Soil - and Pest Management

Numerous practices have been developed to reduce ____________________,including reducing or eliminating tillage,managing irrigation to reduce runoff,and keeping the soil covered with plants or mulch.​

The ____________________ Act of 1935 gave farmers and ranchers technical assistance for setting up soil conservation programs that resulted in reduced erosion.​

What causes soil salinization?​

Excessive irrigation is only a problem in rainy areas that are prone to flooding.​

A way to grow food on steep slopes or mountainsides without depleting topsoil is called ____________________.​

There are no technological substitutes for fertile and uncontaminated topsoil.​

What kind of cropping is where one or more crops,usually legumes or other crops that add nitrogen to the soil,are planted together and between orchard trees or fruit-bearing shrubs,which provide shade?​

​Malnourished individuals may become more prone to infections and disease.

The practice of ____________________is where fish are raised in freshwater ponds,lakes,reservoirs,and rice paddies,and in underwater cages in coastal and deeper ocean waters​

Ninety-eight percent of the potential risk of developing cancer from pesticide residue on food grown in the U.S.could be eliminated if ____.​

Why do our economic systems promote unsustainable forms of industrialized agriculture?​

World grain production per capita has increased consistently and has kept pace with total world production since the middle of last century.​

An irrigation problem that reduces soil oxygen levels,causes accumulation of gases toxic to plants,and alters the concentration of nutrients around plant roots is called ____________________.​

​In nearly one in five death in the U.S.,____________________ plays an important role in heart disease,stroke,type 2 diabetes,and some forms of cancer.

What do sustainable polyaquaculture and livestock agriculture have in common?​

Explain how growing corn in the Midwest creates a 'dead zone' in the Gulf of Mexico.​

Polyface Farm in the U.S.state of Virginia raises beef,chickens and pigs.A particular practice on Polyface Farm is to bring chickens into a pasture after the cows have eaten the grass.The chickens eat the insect grubs that are found in the cow manure.While the chickens fatten up on the insect grubs,they also produce waste,which in turn fertilizes the grass the cows will later eat.Explain this process in terms of sustainable agriculture and the basic principles of sustainability.​

Per unit area,the application of synthetic pesticides is higher on typical crop fields than it is on the average lawn.​

Low energy input ____________________ produces higher yields than does high-input monoculture.​

Trace amounts of sex attractants,otherwise known as ____,can be used to lure pests into traps or to attract their natural predators into crop fields.​