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Soil Fert exam 2
Soil Fertility exam 2
| Question | Answer |
|---|---|
| This is the chemical tool that can be used to raise soil pH and overcome acidic soil problems. a. calcium b. elemental sulfur c. lime d. gypsum e. sodium | c. lime |
| This the chemical tool that can be used to lower soil pH. However, it is very expensive and is only used in small areas that produce high value plants. a. calcium b. elemental sulfur c. lime d. gypsum e. sodium | b. elemental sulfur |
| Which of the following is a major effect that potassium has on plants? a. increases protein levels b. increases water use efficiency by regulating the opening and closing of the stomata c. increases early root growth d. improves N-fixation by legumes | b. increases water use efficiency by regulating the opening and closing of the stomata |
| The most common form of potassium fertilizers accounting for more than 90% of potassium fertilizers old in the U.S. is called potassium chloride. What is the grade? a. 0-44-0 b. 0-0-60 c. 46-0-0 d. 11-52-0 | b. 0-0-60 |
| This nutrient is similar to nitrogen because it can be found in the atmosphere and because soil OM is an important source of this nutrient. Leaching losses is also a concern. a. calcium b. sulfur c. zinc d. magnesium e. manganese | b. sulfur |
| This nutrient is part of chlorophyll in plants; thus a deficiency can reduce plant photosynthesis. A deficiency may also occur when calcium is abundant in the soil. a. copper b. sulfur c. zinc d. magnesium e. manganese | d. magnesium |
| Secondary nutrients are macronutrients as plants still take up significant quantities of these nutrients. Which of the following is NOT a secondary nutrient? a. calcium b. magnesium c. sulfur d. copper | d. copper |
| This element is not essential for plants, but it is essential for N-fixation by Rhizobium bacteria in legume crops. a. cobalt b. iron c. zinc d. copper | a. cobalt |
| Salt injury is a risk when applying starter fertilizers in or near the seed furrow. There are 3 main nutrients with salt risks. Which of these is NOT one of the nutrients that causes salt injury? a. nitrogen b. phosphorus c. potassium d. sulfur | b. phosphorus |
| Which of the following crops would likely have the greatest response to the micronutrient boron? a. dry beans b. wheat c. sorghum d. soybeans e. alfalfa | e. alfalfa |
| Since very small quantities of micronutrients are required by plants, one approach used to correct a zinc deficiency in corn is applying the fertilizer as a ________. a. seed treatment b. broadcast granule c. broadcast liquid d. banded liquid | a. seed treatment |
| Raising _____ is a practical approach recommended for overcoming some micronutrient deficiencies such as molybdenum. a. soil OM b. soil particle size c. soil pH d. soil moisture e. soi N content | c. soil pH |
| The micronutrient chloride has been promoted as being important for maximizing yields of this crop because it is known to help minimize leaf diseases. a. sugar beets b. wheat c. sunflower d. soybeans e. alfalfa | b. wheat |
| Growers have the option of planting _______ varieties that are more tolerant of the chlorosis caused by iron deficiencies. a. corn b. wheat c. sorghum d. soybean e. alfalfa | d. soybean |
| Most sulfur deficiencies in Nebraska are associated with ______. a. high clay soils b. high OM c. sandy soils d. high soil pH e. low soil pH | d. sandy soils |
| High levels of iron may be present in the soil; however, the iron will not be available for plant uptake with _______. a. high clay soils b. high OM c. sandy soils d. high soil pH e. low soil pH | d. high soil pH |
| Corn often responds to zinc fertilization, especially when high amounts of what nutrient is also applied to the corn? a. nitrogen b. phosphorus c. aluminum d. silicon e. sulfur | b. phophorus |
| Concentrations of _______ can reach toxic levels in acidic soils, which can greatly reduce crop yields. a. nitrogen b. phosphorus c. aluminum d. silicon e. sulfur | c. aluminum |
| For each nutrient below, list the correct form taken up by plants. -Calcium -Magnesium -Sulfur -Boron -Iron -Zinc -Copper -Chloride -Manganese -Molybdenum | -Calcium: Ca2 -Magnesium: Mg2+ -Sulfur: SO42- -Boron: BO33- -Iron: Fe2+ -Zinc: Zn2+ -Copper: Cu2+ -Chloride: CL- -Manganese: MN2+ -Molybdenum: MoO42- |
| True or False: One of the reasons soils are rarely deficient in calcium is because lime applications are frequently made to raise soil pH before calcium deficiencies occur. | True |
| True or False: Soils are frequently deficient of the micronutrient nickel. | False |
| True or False: Lime reactivity (effectiveness) increases as the particle size of lime increases | False |
| True or False: Lime application rates should be based on soil pH levels as well as the cation exchange capacity (CEC) of the soil. | True |
| True or False: High yields and harvest removal of nutrients are creating more micronutrient deficiencies in our soils | True |
| Describe 3 factors that can cause soil pH to change over time in fields where crops are grown. | leaching lowers pH flooding increases pH decomposition of OM decreases pH harvest removal decreases pH |
| Describe 2 tools in addition to soil tests a grower can use to determine whether or not to apply a micronutrient fertilizer. | tissue analysis fertilizer demonstrations deficiency symptoms |
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