Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Crop Variety Improvement: This involves selecting or developing crop varieties with desirable traits like high yield, biotic and abiotic resistance, and early maturation. Techniques include Hybridization (crossing between genetically dissimilar plants) and genetic manipulation to produce Genetically Modified Crops ().
Nutrient Management: Plants require 16 essential elements. Air provides and , water provides , and soil provides 13 nutrients. These are categorized into Macronutrients (required in large quantities: ) and Micronutrients (required in small quantities: ).
Manures and Fertilizers: Manures are organic substances that increase soil fertility and content. Fertilizers are commercially produced plant nutrients providing . Overuse of fertilizers can lead to water pollution and soil degradation.
Irrigation: Essential for ensuring crops get water at the right growth stages. Methods include Wells (Dug wells and Tube wells), Canals, River Lift Systems, and Tanks to reduce dependence on monsoons.
Cropping Patterns: Includes Mixed Cropping (growing two or more crops simultaneously, e.g., Wheat + Gram), Intercropping (growing crops in a definite row pattern, e.g., Soyabean + Maize), and Crop Rotation (growing different crops on the same land in pre-planned succession).
Crop Protection Management: Protecting crops from weeds (, ), pests (insects, rodents), and diseases (caused by bacteria, fungi, or viruses). Storage losses are minimized by controlling abiotic factors (moisture, temperature) and biotic factors (insects, microorganisms).
📐Formulae
💡Examples
Problem 1:
A farmer wants to grow Wheat and Gram simultaneously on the same piece of land without a specific row pattern. Identify the cropping pattern and explain how it reduces risk.
Solution:
The cropping pattern is Mixed Cropping. This method reduces risk because even if one crop fails due to adverse weather or pests, the other crop can still provide a harvest, ensuring some food security.
Explanation:
Mixed cropping like or acts as insurance against total crop failure.
Problem 2:
Identify the macronutrients and micronutrients from the following list: .
Solution:
Macronutrients: (Nitrogen), (Phosphorus), (Potassium). Micronutrients: (Iron), (Zinc), (Molybdenum).
Explanation:
Macronutrients are required by plants in large quantities for structural and metabolic functions, whereas micronutrients are needed in trace amounts for enzyme activation.
Problem 3:
Why is it recommended to grow a Leguminous crop () like Pea between two cereal crops in Crop Rotation?
Solution:
Leguminous crops have root nodules containing bacteria which perform biological nitrogen fixation, converting atmospheric into nitrates () in the soil.
Explanation:
This naturally replenishes the soil's nitrogen content (), reducing the need for chemical nitrogenous fertilizers like Urea () for the subsequent crop.