Explore key facts about green gram nutrition and its role in sustainable agriculture with this medium-difficulty quiz. Enhance your understanding of essential nutrients, deficiency symptoms, and management practices for optimal crop performance.
Which macronutrient is most crucial for the initial vigorous vegetative growth stage of green gram plants?
Explanation: Nitrogen is vital for vegetative growth because it is a key component of chlorophyll and proteins, supporting leaf and shoot development. Potassium and phosphorus are important but play bigger roles later in root development and flowering. Calcium assists in cell wall structure but is not the main driver of early vegetative growth.
A green gram crop shows yellowing of lower leaves and poor growth; which nutrient deficiency is most likely responsible?
Explanation: Nitrogen deficiency appears as yellowing (chlorosis) of older leaves and stunted growth due to its mobility and essential functions. Magnesium and sulfur deficiencies also cause yellowing but often affect younger leaves first. Zinc deficiency typically causes interveinal chlorosis and smaller leaves, not general yellowing of mature lower leaves.
Application of which type of biofertilizer is commonly recommended for green gram to enhance nitrogen availability?
Explanation: Rhizobium forms symbiotic nodules with green gram roots, fixing atmospheric nitrogen and improving soil fertility. Azospirillum mainly benefits cereals and is less effective in legumes. Phosphate solubilizing bacteria aid in phosphorus availability, and Trichoderma viride is used for disease control, not nitrogen fixation.
Which micronutrient is particularly important for nodulation and biological nitrogen fixation in green gram?
Explanation: Molybdenum plays a key role in nitrogenase enzyme activity necessary for biological nitrogen fixation in legumes. Copper and iron are essential for other plant processes but not specifically for nodulation. Boron is important for cell wall strength and reproduction, not nitrogen fixation.
A farmer wants to ensure optimal green gram yield; what is the main benefit of applying recommended doses of phosphorus along with nitrogen?
Explanation: Phosphorus supports strong root growth and energy transfer via ATP, leading to better establishment and yield. While it indirectly affects other plant functions, it does not solely increase chlorophyll, confer specific pest resistance, or directly prevent calcium deficiency.