Among oil cakes, which one has the highest nitrogen (N) content?

• Groundnut cake, also known as peanut meal, boasts the highest nitrogen content among the listed oil cakes. Here's a breakdown of their N content:
-Groundnut cake: 7.9%
-Castor cake: 4.3%
-Neem cake: 2-3%
-Coconut cake: 1-2%