30 Questions
Which is not a macronutrient needed by plants for growth?
Manganese
What are the main components of photosynthesis?
Carbon, Hydrogen, and Oxygen
Why is a fertile soil not necessarily productive?
As a result of limiting factors like drought
Which group of nutrients come from the atmosphere and water?
Non-mineral nutrients
What is the process that converts carbon dioxide and water into glucose and oxygen?
Photosynthesis
Which element is classified as a micronutrient needed by plants in smaller quantities?
Boron
What is the name of the law in plant nutrition that suggests a plant's growth is limited by the nutrient in shortest supply?
Liebig's Law of the Minimum
According to Liebig's Law of the Minimum, what happens once the supply of the most limiting nutrient is improved?
The next limiting nutrient controls plant growth
How many essential nutrients are required for plant growth and development?
16
Which scientist is known for naming the law that a plant's growth is limited by the nutrient in shortest supply?
Justus von Liebig
What happens if a plant receives all nutrients at an optimal level without any deficiencies or excesses?
It can produce to its full potential
What principle suggests that if a deficient nutrient is supplied, yields may improve until another nutrient becomes the limiting factor?
Law of the Minimum
Which three macronutrients are most often managed by the addition of fertilizers to soils?
Nitrogen, Phosphorus, Potassium
Which nutrients are most often found in sufficient quantities in most soils?
Calcium, Magnesium, Sulphur
Which nutrients are considered primary nutrients from a management perspective?
Nitrogen, Phosphorus, Potassium
From a crop production standpoint, why are Nitrogen, Phosphorus, and Potassium considered primary nutrients?
They are often limiting
The ability of soils to supply secondary nutrients indefinitely is dependent upon which law?
Law of Conservation of Matter
Continued crop removal of Calcium, Magnesium, and Sulphur requires replenishment because they act as:
Secondary nutrients
Which mechanism is the major process for the movement of positively charged nutrients to the root surface?
Diffusion
What negatively charged ion is mentioned in the text as one of the components of soil water?
Nitrate
Which factor affects mass flow according to the text?
Soil water content
What negatively charged ion is NOT mentioned in the text as a component of soil water?
Phosphate
What is the process referred to as when some water and nutrients move below the root zone?
Leaching
Which nutrient has a positive electrical charge when dissolved in soil water and does NOT move primarily through diffusion?
Sulfur
What are the two main phases involved in nutrient absorption and utilization in plants?
Root interception and mass flow
Which of the following is NOT a mechanism by which nutrients reach the surface of root hairs?
Mass diffusion
What is the primary driving force behind mass flow, moving water from soil pores into plant roots?
Transpiration
Why is root interception not considered a major mechanism for nutrients to reach the surface of plant roots?
Roots tend to grow around soil aggregates, not into them
Which factor does NOT affect root interception according to the text?
High soil temperature
What percentage of the plant roots come in direct contact with the soil surface within soil aggregates?
~1% to 2%
Explore the essential elements required by plants for growth and development, as well as the process of nutrient movement from soil to plants. Understand the importance of soil fertility and the factors that can limit crop production despite adequate fertility.
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