fertilizers are necessary if the soil lacks one of the following nutrients: a. calcium, carbon, potassium b. nitrogen phosphorus, potassium c. nitrogen, phosphorus, magnesium d. nitrogen, calcium, magnesium e. phosphorus, potassium, magnesium
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fertilizers are necessary if the soil lacks one of the following nutrients:
a. calcium, carbon, potassium
b. nitrogen phosphorus, potassium
c. nitrogen, phosphorus, magnesium
d. nitrogen, calcium, magnesium
e. phosphorus, potassium, magnesium
Step by step
Solved in 2 steps
- Which factors affect soil quality? a. chemical composition b. history of the soil c. presence of living organisms and topography d. all of the aboveFor which of the following problems would growing and maintaining cover crops be an appropriate solution? Erosion is thinning the soil on a farm. The organic matter and nutrients in the soil on a farm are being depleted. The soil on a farm is becoming arid due to decreased water-carrying capacity. a I and II only b I and III only c II and III only d I, II, and IIIWhich of the following strategies is most helpful for protecting the soil from water erosion? a Alley cropping with tilled soil b Planting crops in contour strips c Rotating crops between different fields d Using shelterbelts to separate crop fields
- Name the following as soil forming processes: a. Soil erosion b. Formation of humus c. Weathering of sand d. Nutrients absorbed by plant roots e. deposition of organic matter f. Leaching of water along with dissolved ionsThe practice of crop rotation uses nitrogen fixation to create fertile fields. First, a plant without a nitrogen-fixing relationship, such as corn, is planted. After the harvest, a nitrogen-fixing plant replaces the initial crop. Instead of harvesting the nitrogen-fixing plant, however, it is plowed under. The cycle continues in this manner. Which of the following is not an abiotic factor that affects plants being used in crop rotation? a) NH3 availability b) Soil temperature c) Herbivore density d) Oxygen concentrationSome of the problems associated with intensive irrigationinclude all of the following except(A) soil salinization.(B) overfertilization.(C) land subsidence.(D) aquifer depletion.
- Based on temperature requirements which of the following is not correct?* a. Coconut and mango are tropical crops b. Asian rice and wheat are cool season crops c. Citrus species are sub-tropical crops d. Cruciferous vegetables are cool season cropsWhich nutrient moves into plants during primary production? a.phosphorus b. nitrogen c. carbon d. none e. all threeWhat fraction of the soil represents the most active? A. Clay B. Pore spaces C. Humus D. Soil colloids
- The inorganic nutrient most often lacking in crops is(A) carbon.(B) nitrogen.(C) phosphorus.(D) potassiumSoil particles may be held together by which of the following to form aggregates? Group of answer choices a) Humus b) Clay c) Iron Oxides d) All of the above e. None of the aboveA farmer growing maize in Eastern Cape under rainfed and marginal soils approaches you and tell you that maize is no longer doing well under his farm. Some of the soil characteristic in his farm include waterlogging, high pH and low water holding capacity. Advise the farmer on why you believe grain sorghum will do well under his farm conditions.