| Subject Code : | AGRI4401 | Country : | Australia |
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AGRI4401: Advanced Crop Production Agriculture Assignment Help
Assignment Task:
1. List four of the eight factors to consider when investigating the cause of yield and quality variability in a paddock/field for Site Specific Crop Management (SSCM)
2. Yield monitor data must be ‘cleaned’ before use. What are the main sources of error in the data?
3. Why are Cartesian coordinates (like UTM) used in precision agriculture, rather than geographic coordinates?
4. List three common methods used in precision agriculture for spatial prediction when making digital maps.
5. Briefly explain what a local prediction technique is for spatial prediction.
6. Briefly explain what a global model is for spatial prediction.
7. Briefly explain the difference between inverse distance squared and kriging for spatial prediction.
8. At an early stage of Site-Specific Crop management (SSCM), what three main factors make a paddock MOST suitable for more in-depth investigation for possible variable rate application of inputs?
9. Arithmetic methods (mean, sum etc.) are not used to combine DIFFERENT TYPES of maps such as those derived from soil data and yield. Why is this and give an example of two maps/data that you could not combine.
10. What are yield and protein generally negatively correlated? Are there situations when they are positively correlated and why might this be the case?
11. In remote sensing there are four resolution attributes. List the four attributes and describe them briefly IN YOUR OWN WORDS.
12. Describe what NDVI is and how it is measured
13. What can you infer (tell) from NDVI (Normalised Difference Vegetation Index) data about a crop in the field.
14. Briefly describe how you might go about setting up a nitrogen fertiliser rate response trial on a farm that has controlled traffic with variable rate technology (you can draw diagrams if you wish).
15. There are a number of soil properties that will control the ability of the soil to conduct electricity ie. its electrical conductivity (ECa). Name three of these properties. (3 marks)
16. See the supplied maps with crop yield, electrical conductivity (ECa) and gamma radiometric (thorium emissions) and gamma radiometric (potassium K band). What can you say about the soil at the sites labelled No 1, 2 3 and 4 on the maps?
17. What are the three main elements in the soil that have naturally occurring isotopes which emit gamma rays as they decay (and are measured in gamma radiometric)?
18. Nitrogen prescription maps can be developed from soil nitrogen data before seeding. Phosphorus prescription maps can be developed from the previous crop yield data and soil analysis data. Which of these two prescription maps (nitrogen or phosphorus) is more useful for a farmer who is about to seed a crop? Explain your reasoning.
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