Sharpen your understanding of nutrient management techniques essential for maximizing groundnut yield and quality. This quiz explores the role of specific nutrients, application methods, and common challenges in groundnut cultivation.
Which nutrient is critical for proper pod formation in groundnut, particularly when applied as gypsum at the pegging stage?
Explanation: Calcium is vital for pod development in groundnut, often supplied as gypsum during the pegging stage. Potassium supports disease resistance and water regulation but is less critical for pods. Iron and zinc are micronutrients important for overall plant health but do not directly influence pod formation like calcium.
How does groundnut primarily meet its nitrogen requirements during growth?
Explanation: Groundnut forms symbiotic relationships with Rhizobium bacteria to fix atmospheric nitrogen, reducing the need for high external inputs. Foliar sprays and green manures can supplement nitrogen but are not the main source. Heavy urea use is not a primary recommended practice as it can suppress natural fixation.
Why is phosphorus particularly important for groundnut during its early growth stages?
Explanation: Phosphorus is essential for robust root growth and energy transfer during early development. While it slightly affects other attributes, its main role is in root and seedling vigor. Leaf greenness is linked more with nitrogen, disease resistance with multiple nutrients, and oil content with overall crop health.
A farmer notices pale, yellowish young leaves in their groundnut crop. Which nutrient deficiency is most likely responsible?
Explanation: Sulphur deficiency in groundnut usually causes yellowing of young leaves due to its role in chlorophyll formation. Manganese and magnesium deficiencies also lead to chlorosis but often show different patterns or affect older leaves. Boron deficiency mainly causes poor seed set and not general leaf yellowing.
When is the optimal time to apply potassium fertilizer in groundnut cultivation to support maximum yield?
Explanation: Potassium should be applied at sowing because it is needed throughout the plant's vegetative and reproductive stages. Late application at flowering or after pod maturity is less beneficial. Potassium at harvest or after pods have matured does not enhance yield.