Give me introduction chapter for the application of nano urea in black gram - tlooto, The Most Powerful AcademicGPT

Introduction Background Black gram (Vigna mungo), a short-duration legume, holds a crucial position in global and particularly Indian agriculture due to its rich protein content and its significance in vegetarian diets. India, as the world’s leading producer and consumer of pulses, relies heavily on crops like black gram to fulfil nutritional requirements, especially since pulses supply approximately 14% of total protein intake for vegetarians [1]. However, despite its agronomic and nutritional importance, black gram productivity remains suboptimal compared to its potential, largely due to inadequate and inefficient nutrient management practices, soil fertility issues, and diminishing returns from traditional chemical fertilizers [1][2]. The Nitrogen Conundrum and Fertilizer Innovations Nitrogen is a vital macronutrient for plant development, yet conventional approaches to nitrogen fertilization are characterized by poor use efficiency, with less than 40% of applied nitrogen typically