Garlic 50 lb/A Nitrogen is Enough In 100% of eight side-by-side comparisons, there were no differences in yield among 50 lb/A, 100 lb/A and 150 lb/A of spring-applied inorganic nitrogen in German hard neck garlic. Nitrogen Requirements in Garlic: 50 lb/A is Enough Navigation Crops Brassicas Garlic Onions Potatoes Sweet Corn