Top dressing helps to boost Nitrogen in the plant that improves grain formation and development of a broad leaf area index which provides food for the plant which is vital for high Frontiers Suitable split nitrogen application increases grain yield and photosynthetic capacity in drip irrigated winter wheat (Triticum aestivum L.) under different water regimes in the North China Plain Solvi Blog How SLU researchers use drones to develop large scale models for Variable Nitrogen Rates in Winter Wheat Farming 101: Planting Wheat