The inorganic nutrient most often lacking in crops is a. carbon. b. nitrogen. c. phosphorus. d. potassium.

Verified step by step guidance

1. Step 1: Understand the question. The question is asking which inorganic nutrient is most often lacking in crops. Inorganic nutrients are minerals that plants need to grow and develop. They are absorbed from the soil by the plant's roots.
2. Step 2: Review the options. The options given are carbon, nitrogen, phosphorus, and potassium. All of these are essential nutrients for plant growth.
3. Step 3: Consider the role of each nutrient. Carbon is obtained from the atmosphere through photosynthesis, so it is unlikely to be lacking. Phosphorus and potassium are important, but they are usually present in sufficient quantities in the soil.
4. Step 4: Identify the correct answer. Nitrogen is the nutrient most often lacking in crops. Although nitrogen makes up a large portion of the Earth's atmosphere, plants cannot use it in its gaseous form. They rely on bacteria in the soil to convert the nitrogen into a form they can use. If the soil lacks these bacteria or if the plants have used up all the available nitrogen, a nitrogen deficiency can occur.
5. Step 5: Confirm the answer. The correct answer is (b) nitrogen.

Key Concepts

Nutrient Deficiency in Crops

Nutrient deficiency occurs when plants do not receive essential nutrients in adequate amounts, leading to poor growth and reduced yields. In agriculture, understanding which nutrients are most commonly deficient helps farmers optimize fertilization and improve crop health.

Role of Nitrogen in Plant Growth

Nitrogen is a critical macronutrient for plants, as it is a key component of amino acids, proteins, and nucleic acids. It promotes vigorous growth and is essential for the synthesis of chlorophyll, which is vital for photosynthesis. Nitrogen deficiency often results in stunted growth and yellowing of leaves.

Phosphorus and Crop Development

Phosphorus is another essential macronutrient that plays a crucial role in energy transfer, photosynthesis, and the formation of DNA and RNA. It is vital for root development and flowering. A deficiency in phosphorus can lead to poor root systems and reduced crop yields.