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Crop Science Test 2
| Question | Answer |
|---|---|
| Examples of reduced or conservation tillage systems include | ridge tillage, strip tillage, and no till |
| Two possible consequences of excessive cultivation in crops are | loss of soil moisture and root pruning |
| The major function of the moldboard plow is to | invert the topsoil and bury debris |
| The major function of the subsoiler or chisel plow is to | Break up deep hardpans or compacted layers |
| The oldest and mos familiar form of weed control is | mechanical (the hoe) |
| A nonselective herbicide | is capable of killing almost any green plant species |
| Weeds are classified according to life cycle (annual vs. perennial) and | broadleaf vs grasses |
| Many crop plants now have weed and insect management strategies "built in" in the form of | genetically engineered tolerance to herbicides and production of insecticides |
| An example of the disease management principle of protection is | seed treatment with a fungicide to protect against seedling diseases |
| Herbicides can be grouped largely as either systemic or | contact |
| In the backcross method of crop improvement the major objective is | improvement of one specific trait for an otherwise acceptable cultivar |
| A very popular method of crop improvement, used most often to improve an established cultivar for a single, specific, simply inherited trait is | backcross method |
| The three major methods of crop improvement (plant breeding) include | mass selection, pedigree selection, and backcross method |
| The primary commercial type of corn grown in the US is | dent corn |
| A good rule of thumb for calculating N rates for a corn crop is | 3 g/plant |
| Time to maturity in corn is mainly determined by | accumulation of heat units |
| Commercial F1 hybrid cultivars are economically feasible in corn because | corn has a unique flower structure, with complete separation of male and female flowers on the same plant |
| Corn is more sensitive to zinc deficiency than most crops and most likely to show symptoms | in soils with a high pH and sandy soil texture |
| Imbreeding (self pollination) of corn for a few generations leads to | a lowering of yield and plant vigor and increased uniformity |
| Peanut flowers are produced above ground, but the fruits are produced below ground | attached to structures called pegs |
| The primary market class of peanut grown in alabama area is | runner |
| Unlike most of the other crops we have studied, peanut produced in the us is primarily utilized as | human food, in candy, peanut butter, and whole nuts |
| Peanut seed are planted deeper than most other agronomic crops because | they are large seeded, requiring more water for germination, and are usually planted in sandy soils |
| Peanut came to the US from Africa, but peanut is thought to have originated in | Brazil/Paraguay area in S. america |
| Two nutrient elements that are generally considered to be most critical in the production of peanut are | boron and calcium |
| An example of a selective herbicide is | 2-4-D |
| Give tow reasons why we till the soil | To prepare seedbeds and bury crop debris |
| Give three ways weeds can cause losses in crop production systems | contaminate product - compete for water, sunlight, nutrients - host diseases and pests |
| What historical event had the most impact on US corn production | Development of F1 hybrid cultivars |
| Harvest maturity is difficult to predict in peanuts. Give two reasons why and briefly tell how harvest maturity is often determined. | peanut crop is underground and indeterminate - you can use the hullscrape method to determine maturity |
Created by:
twp0001
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