Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Soil Fert exam 1
Soil Fertility exam 1
| Question | Answer |
|---|---|
| The original source of nitrogen for all chemical forms of nitrogen fertilizers is ______? a. minerals that are mined b. atmospheric nitrogen c. chemically treating manure d. compost piles | b. atmospheric nitrogen |
| Which of the following is NOT a primary macronutrient for crops? a. iron b. potassium c. nitrogen d. phosphorus e. none are macronutrients | a. iron |
| Which of the following is a form of nitrogen that is available for root absorption? a. nitrous oxide (N2O) b. urea c. nitrogen gas (N2) d. ammonium (NH4) e. all are correct | d. ammonium (NH4) |
| Four of the processes below are losses of nitrogen from the soil. Which one adds nitrogen to the soil? a. volatilization b. erosion c. leaching d. fixation e. denitrification | d. fixation |
| Immobilization is when soil microbes feed upon crop residues, a temporary reduction of plant available nitrogen in the soil occurs. A major factor that influences if this occurs is ______ a. N:P:K ratio b. C:N ratio c. lightning d. soil chloride level | b. C:N ratio |
| Which of the following is a form of phosphorus that is available for plant uptake? a. elemental P b. potash c. phosphate d. organic P e. all are correct | c. phosphate |
| Which of the following nutrients has the greatest mobility and is the most readily available for plant uptake? a. nitrogen b. phosphorus c. potassium | a. nitrogen |
| Most plants recover _____ of phosphorus fertilizers the first year after application. a. 1-2% b. 20-30% c. 60-70% d. 80-90% e. 100% | b. 20-30% |
| Which of the following nitrogen fertilizers has volatilization losses when applied to the soil surface? a. diammonium phosphate b. ammonium sulfate c. ammonium nitrate d. urea e. none are correct | d. urea |
| The source of phosphorus for creating phosphorus fertilizers. a. mined phosphate rock b. chemically treated manure c. phosphorus gas in the atmosphere d. peat deposits from swamps | a. mined phosphate rock |
| Nitrogen is an essential nutrient in plants because it is a major component of _____. a. DNA b. proteins c. carbohydrates d. fats e. none are correct | b. proteins |
| Phosphorus is often applied at planting because it is known to _______. a. raise soil pH levels b. activates seed germination c. help plants fight off seedling diseases d. stimulates early root formation and growth | d. stimulates early root formation and growth |
| Leaching losses of nitrogen is most likely to occur in soils that are _______. a. sandy b. poorly drained c. acidic d. high in OM e. all are correct | a. sandy |
| Which form of nitrogen is very susceptible to leaching losses? a. nitrous oxide (N2O) b. nitrate (NO3) c. nitrogen gas (N2) d. ammonium (NH4) e. urea | b. nitrate (NO3) |
| Which fertilizer below is a liquid form of nitrogen that can be side-dressed or fertigated? a. 18-46-0 DAP b. urea c. 32-0-0 UAN d. 82-0-0 anhydrous ammonium e. 10-34-0 APP | c. 32-0-0 UAN |
| What is the tie-up problem with phosphate? a. phosphate very easily reacts with cations like Ca++ or Mg++ b. phosphate converts very easily to a gas form and is lost c. phosphate is carried by insects and microbes deeper into the soil | a. phosphate very easily reacts with cations like Ca++ or Mg++ |
| What is the process in which NO3 is converted to gaseous forms such N2O, causing a loss from soil. It is an anaerobic process that is primarily a concern in poorly drained soils? | Denitrification is |
| What is the process in which the organic nitrogen in plant residue is converted to available nitrogen in the form of NH4 or NO3 as the plant residue decays. | Mineralization |
| What is the process in which the N2 found in the air is made available to legume plants by the action of symbiotic bacteria. | Fixation |
| What nitrogen fertilizer application timing provides the best nitrogen fertilizer use efficiency. | While the crop is actively growing |
| What is the difference between a top dress fertilizer application and a side-dress application? | Top dress is applied over the whole field including rows. Side-dress is applied in between the rows next to the plants. |
| Describe 2 advantages of broadcast application of phosphorus fertilizers and 2 advantages of band applications of phosphorus fertilizers. | Broadcast: Better for long term fertilization, faster & easier, higher rates Band: Reduces tie-up, cuts rate in 1/2, better early growth stimulation |
| Provide one example of a specialty nitrogen fertilizer or nitrogen fertilizer additive that can prevent losses and improve the nitrogen fertilizer use efficiency. | Nitrification inhibitors: slows the conversion of NH4+ to NO3- |
| Describe the concept of soil cation exchange capacity (CEC) and why it is an important part of a productive soil. | It measures the number of exchangeable cations the soil can hold. It also measures how many negative charges the soil has. It's important in productive soils because it is largely determined by clay and OM |
| What is the difference between a macronutrient and micronutrient? | Plants need larger amounts of a macronutrient than a micronutrient |
| Describe the exact meaning of the grade 10-35-15 | 10 % N nitrogen 35% P2O5 phosphate 15% K2O Potash |
Created by:
user-2010091