Nitrogen is one of the three macro-nutrients needed for healthy plants. It is the eldest brother N within the NPK trio. In the tropics, this vital ingredient is often found lacking in cultivated soil. From my experience using the soil test kit in various gardens in Singapore, nitrogen always shows up as “low”.
How can this be! There are tons of nitrogen in the atmosphere, roughly 78%. However, atmospheric nitrogen doesn’t just flow into the soil readily as it is inert. Continue reading