agronomy

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Which of the following plants are natve to North America? a.) Wheat, oat and soybean b.) Corn pumpkin and sunflower c.) both a and b d.) none of the above

b.) corn, pumpkin and sunflower

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The us government describes an invasive plant species as...

any non-native plant species that causes economic or enviormental harm

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Fertilizers are sold in many different formulations, most often expressed as ratios. A fertilzer designated "tripple-thirteen" refers to a fertilizer containing...

13% N, 13% P2O5, 13% K2O

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Failure of seed to germinate after planting can be caused by many factors. Which of the following reaons in NOT a cause for this failure? a.) non-viable seed b.)unfavorable soil temperature c.) dry seedbed d.) soil crusted at surface

d.) soil crusted surface

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Geotropism is caused by plant hotmones that cause a plant to...a.) lean toward a light source b.) have downard growth of roots c.) have upward growth of stems d.) both b and c

d.) both b and c

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Weeds are always undesireable in a forage crop because they a.) usually reduce forage quality of the crop b.) take moisture and nuitrents from the forage plants c.) are often unpalatable to livestock d.) all of the above

d.) all of the above

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choose between two lots of alfalfa hay that are equivalent in quaility and both are selling for $150 per ton. There is only one difference, lot A is 10% moisture and lot bis 15% moisture what is the actual price per ton of dry matter for each lot of hay?

A= $167 and B=$176

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You have been called to a corn producer to assess potential grain yeild loss from hail damage. Plants are at the four-leaf stage and have an average leaf defoliation of 25%. the anticipated yield loss will be...

none

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In small grain production , jointing refers to which of the following? a.) tiller production(Feekes stage 3) b.) the grain is in the boot (Feekes stage10) c.) The first node is visible (Feekes stage6) d.) The flag leaf had emerged (Feekes stage 9)

c. The first node is visible (Feekes stage 6)

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Whic of the following crops is a dicot? a.) corn b.) rice c.) orchardgrass d.) flax

d.) flax

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which of the following soils would hold the most water a.) sand b.) loam c.) sand loam d. silty clay

d.) silty clay

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Which of the following nutrients becomes more available as the pH increase (becomes more alkaline)? a.) manganese b.) iron c.) copper d.) calcium

d.) calcium

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you have a rice field that measures 1350 ft. x 1452 ft. Your soil test recommends that you apply 125 pounds of nitrogen per acre to this field. How much urea (46-0-0) do you need to apply to this field to meet the recommendation?

6.11 tons

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The velvetleaf and grasses in your field are turning white. Which of the following herbicide types most likely was applied? a.) amino acid inhibitor b.) pigment inhibitor c.) cell membrane disruptor d.) photosynthesis inhibitor

b.) pigment inhibitor

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Which of the following is a secondary nutrient? a.) nitrogen b.) calcium c.) boron d.)iron

b.)calcium

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Your corn crop is showing an average of two collars per plant. What is your crop's growth stage? a.) V2 b.)R1 c.)R5 d.)V5

a.)V2

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Which following tillage systems and residues would provide the most water infiltration 1 hour after a rain? a.) plowed, disked, cultivated with bare surface b.) no-tillage, 80% residue cover c.) no-tillage, bare surface d.) no-tillage, 40% residue cover

b.) no-tillage, 80% residue cover

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the nozzels on your spray boom are 20 inches apart. You are applying 20 gallons of spray per acre at 3 MPH. what is your nozzle output?

.20 gallons per minute

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what is ammonification?

the bichemical process whereby ammoniacal nitrogen is released from nitrogen containing organic compounds

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The "critical value" for plant nutrition is..

the nutrient concentration in the plant below whivh a yield response to added nitrogen occurs.

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What role does nitrogen play in a plant ?

it is used for synthesis of proteins

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A soil is classified as "acidic" if it has a pH of

blow 6.5

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Rill erosion is defined as

fast flowing surface water cuts small channels or streamlets into the soil

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You are planting pinto beans. You want to plant 60 pounds of viable seed per acre. The seed you purchased is 95% pure with a germination of 93%. How many actual pounds must you plant ?

68 pounds

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Which of the following factors affect spray drift? a.) nozzelsize, evaporation rate, boom width b.) spray pressure, nozzle ize, soil texture c.) boom height, evaporaton rate, spray pressure d.) spray viscosity, nozzel matweial, residue

c.)boom height,evaporation rate, spray pressure

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Farmer Beach plants corn at 32,000 plants per ace. The seed had a 92% germination. What is the expected stand?

29,440 plants per acre

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Which of the following is NOT a benefit of liming acid soils? a.) increased supply of calcium and magnesium b.)increased soil pH and availability of aluminum, maganese and iron c.)increased favorable microbial activity d.)improved soil structure and tilth

d.) improved soil structure and tilth

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Plant analysis a.) is a very good substitute for a soil test b.) provides a tool to develop more efficient and economical fertilizer usage c.) should be correlated with soil sampling and field problems or situations d.) both b and c

d.) both b and c

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The leaf blade of a grass plant is attached to a leaf sheath which in turn attaches to the stem of the plant at the a.) auricles b.) ligules c.)node d.) none of the above

c.) node

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If a soil test indicates that your field is low in phosphorus and potassium, the fertilizer recommendation might suggest that you

apply only liquid fertilizers that might have higher availability

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The fertilizer recommendations that a farmer receives with he soil test results typically vary the most with... a.) crop and yield goal, b.) time of the year, c.) method of application d.) the level of conservation tillage the farmer uses

a.)crop and yield goal

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The cation exhange capacity (CEC) is a measure of the capacity of a soil to hold exchangeable cations. Exchangeable cations in the soil a.) include potassium, calcium, magnesium, and zinc b.) include hydrogen, iron, and manganese

both a and b

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In some cases, one can estimate the amount of organic matter found in the soil until it becomes totally black. Soil is black when the organic matter content is equal to or greater than___________percent a.) 2 b.) 4 c.) 5 d.) none of these

c.) 5

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In order for crop residue to decay, microbes must be present

in addition to temperatures betwen 52-86 F, adequate moisture and good soil aeration

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Tomato spotted wilt virus (TSWV) affects which of the following type of crop protection product(s)? a.)nematicide b.) miticide c.) fungicide d.) all of the above

d.) all of the above

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Powdery mildew can be controlled by using which of the following type of crop protection product

(blank)

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