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Prec. Farm. Exam 1
Precision Farming Exam 1
| Question | Answer |
|---|---|
| In order to accurately determine a three-dimensional location that includes altitude, a GPS receiver must receive signals from at least ______ satellites a. 1 b. 2 c. 3 d. 4 e. 5 | d. 4 |
| ______ greatly improves the accuracy of GPS by utilizing one or more stationary towers located at precisely surveyed locations to help measure and reduce errors a. multitasking b. pseudo-ranging c. remote sensing d. differential correction | d. differential correction |
| Which of the following is NOT a satellite -based DGPS correction signal? a. Nationwide-US Coastguard b. WAAS c. Starfire d. OmniStar e. none are correct | a. Nationwide-US Coastguard |
| Gathering information about your crop without actually touching it. Examples include aerial or satellite images of crop fields. a. site-specific management b. variable-rate technology c. EC sensors d. GPS e. remote sensing | e. remote sensing |
| What is the name of the soil sensor developed by precision planting that can be installed on each row of a planter and detects multiple soil properties such as a soil moisture and temperature? a. GIS b. Crop Metrics c. NDVI Sensor d. Smart Firmer | d. smart firmer |
| Most grid soil sampling programs will collect and analyze a soil sample for every _____. a. 100 sq ft b. 1/2 acre c. 2 to 2.5 acres d. 10 acres e. 20 acres | c. 2 to 2.5 acres |
| Several types of soil sensors are commercially available; however, none of these soil sensors can estimate soil ______ variability in the field. a. nutrient levels b. organic matter c. texture d. pH e. none are correct | a. nutrient levels |
| The electrical conductivity (EC) sensor can estimate variations in soil _______within a field. a. pH b. nitrogen levels c. texture d. bulk density e. all are correct | c. texture |
| The most accurate guidance system available to farmers. a. WAAS b. GLONASS c. RTK d. U.S. Coast Guard DGPS e. none are correct | c. RTK |
| Which of the following is the least accurate method of measuring the ground speed of a combine? a. radar b. ultrasonic c. shaft-speed d. GPS-based e. all have equal accuracy | c. shaft speed |
| Veris Technologies has on-the-go soil sensors that can measure _______. a. nitrogen and pH b. pH and organic matter c. nitrogen and organic matter d. CEC and phosphorus e. none are correct | b. pH and organic matter |
| What is the purpose of the header position sensor on yield monitoring systems a. improves accuracy of measuring speed b. used to estimate crop yields on forage chopper c. determines moisture content d. turns the yield mapping of the monitor on and off | d. turns the yield mapping of the yield monitor on and off |
| _______ is the technology on a sprayer that can turn individual nozzles or spray-boom sections off when reaching field borders, thus eliminating overlap. a. variable-rate technology b. auto-steer c. swathe control d. remote sensing e. yield monitors | c. swath control |
| What is the most logical precision farming technology to try first? | Auto-steer using GPS |
| True or False: Yield monitors are available for grain combines, but not for other crop harvesting equipment such as cotton pickers. | False |
| True or False: The cost of adding swath control to a sprayer or planter is more justified when field shapes are irregular or when edges are curved like a center-pivot. | True |
| True or False: A combine yield monitor will record yield data for each individual square foot of a field. | False |
| True or False: A combine yield monitoring system must have an RTK level of guidance accuracy. | False |
| True or False: Currently, there are no tractor guidance systems available that can turn the tractor and implement around automatically when it reaches the end of the field. | False |
| For each soil property below, describe about how many years the property is stable and doesn't change. -Soil texture -Soil OM -Soil pH -Soil nitrogen levels | Soil texture: doesn't change Soil OM: 10-20 years Soil pH: 4-5 years Soil nitrogen levels: 1 year |
| List 3 benefits of Autosteer | -Look behind you more - straight lines - less overlap -reduces inputs |
| List 2 types of grain flow sensors and briefly describe how each works. | Impact sensor: measure the force & and how often grain hits it Optical flow sensor: uses light beam & how often its disrupted Load sensor: measures weight Radiometric: uses radio waves |
| List and describe the equipment and info necessary for a combine yield monitoring system to measure and map instantaneous yield of a corn field. | -Moisture sensor: accounts for water weight -Grain flow sensor: measures amount of grain -GPS receiver: creates map -Ground speed & cutting width: measures area and accounts for where the yield data should be shown -yield monitor: displays results |
| Provide 2 examples of farm operations that would benefit from light-bar guidance without autosteer | tillage, mowing, broadcasting, spraying |
| Describe 3 types of errors that can reduce the accuracy of a GPS | Atmospheric- affects speed Orbit- involves satellite drifts Atomic clock- wrong time=wrong distance multipath- objects in the way create a longer signal |
| Describe the general process of calibrating a combine yield monitor. Include the number of calibration runs needed. | Collect sample of grain, weigh it in scale wagon, put the correct data into monitor, hit the calibrate button, gives error % and corrects itself Calibrate one per year once per crop minimum & until you reach your desired error percentage goal |
| Describe the details of the grid sampling approach to obtaining soil samples including why GPS is needed. | Use GPS to create 2-2.5 acre plots Collect about 10 6-inch cores in each plot Send in samples & analyze results Most labor-intensive process but lasts longer and is most accurate |
| Describe the details of a zone sampling approach to obtaining soil samples in field. Be sure to include examples of information used to establish the sampling zones. | Split field int zones based on yield data, slope, or texture Within zone collect 10-15 cores Send in samples to get results for each separate zone & create maps |
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