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Soil Fert final 1
review from class on April 13
| Question | Answer |
|---|---|
| Soybeans is a unique crop because some varieties are more tolerant to deficiencies of this micronutrient? | Iron |
| What are the two R's of Nutrient Management? Right Nutrient at the Right Rate at the Right ________ and in the Right ______ | Right time Right place |
| If your soybean field needs sulfur, which fertilizer is the best choice? AMS or mix of sulfur, potassium, and magnesium? | The mix because soybeans already produce nitrogen, so they don't need extra |
| What is the term for when a fertilizer is placed in the seed furrow? a. side band b. popup c. directed d. crack and crevice | b. popup |
| What is the process of bacteria capturing N2 gas for legumes? | Nitrogen fixation |
| Describe deficiency symptom for: Nitrogen Phosphorus Potassium Sulfur Iron Zinc | Nitrogen- yellow bottom leaves Phosphorus- purpling Potassium- yellowing on the edges Sulfur- yellowing of top leaves Iron- yellow leaves with green veins Zinc- Big white blotches |
| Grass cover crops do a great job of building mycorrhizae fungi. What nutrient does these fungi help crops to more easily obtain? | Phosphorus |
| What nutrient do many strip-till farmers apply deep into the soil? | Phosphorus |
| a) Which nutrient is the least mobile? b) Which nutrient most mobile? | a) Phosphorus b) Nitrogen |
| What is the actual chemical that is in lime? a. MgSO4 b. CaSO4 c. CaCO3 d. KCL | c. CaCO3 |
| What is the exact meaning of the fertilizer grade 30-0-3? | 30% Nitrogen N 0% Phospate P2O5 3% Potash K20 |
| Besides ppm nitrate-nitrogen; what other soil test result is used in determining nitrogen fertilizer needs? | Organic Matter content |
| What is the advantage of using crop sensors like the Green Seeker for nitrogen decisions rather than soil nitrogen tests? | Tells you nitrogen input/losses from unpredictable weather |
| Besides preventing nitrogen losses, what other benefit does a slow-release form of liquid nitrogen provide? | Doesn't burn the leaves |
| How does Cation Exchange Capacity affect fertilizer decisions? a. affect tie-up of phosphorus b. affects maximum amount of nitrogen applied at once c. affects amount of lime needed to raise pH d. b and c e. all the above | b and c |
| Cobalt is not an actual plant essential nutrient; but in terms of plants getting essential nutrients, why is cobalt beneficial in the soil? | Legumes need it to make nitrogen |
| Which micronutrient does wheat respond to well because it helps to suppress diseases? | Chloride |
| a) What is the recommended depth for collecting soil samples for fertilizer decisions? b) What nutrient is it recommended to collect deeper samples? | a) 8" b) Nitrogen |
| What 3 nutrients have a high salt injury risk when banding at planting? | Nitrogen, Sulfur, Potassium |
| How is phosphorus tied up and made unavailable to plants? | It combines with other nutrients with a positive charge and forms compounds in the soil |
| pH has a significant effect on nutrient availability a) Raising pH to the optimal 6.5-7 can make this micronutrient available. b) Even a near optimal pH of 7 might be deficient of this micronutrient. | a) molybdenum b) Iron |
| Cowpea and green mungbean are warm season legumes used as cover crops. Vetch is cool seas legume. What benefit do legume cover crops provide? | They put nitrogen back into the soil |
| One fertilizer application strategy is to replace what was removed by harvest of the previous crop. Which 2 nutrients on this chart are best suited for the approach? | P205 and K20 |
| If the % hydrogen is high in the soil, it is a sign that this soil property will be low. | pH, more hydrogen=more acidity |
| a) Denitrification losses are most likely under what soil condition? b) Nitrate leaching losses are most likely under what soil condition? | a) Clay or poorly drained b) sandy |
| Acidic soils make this element more available for plant uptake causing toxicity and poor roots | aluminum |
| What was one of the reasons that Dr. Dave Franzen gave for biological products like Pivot Bio not working? | Different combinations of soil types and no proof that the bacteria is still alive. There are billions of bacteria already in the soil as well |
| In North Dakota, Dr. Dave Franzen is saying you receive this if a field has been in continuous no-till for 6 years or more? | 10-50lbs credit of nitrogen |
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