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Healthy Growth. The amount of nitrogen returned to the soil by clovers depends on the health and vigor of the plants. Clovers appreciate weekly irrigation and soils with moderate amounts of organic matter. Most varieties prefer to grow in full sun, but white clovers are a notable exception that tolerates partial shade.
The Nitrogen Cycle. Nitrogen is also key in the existence of ecosystems and food chains. Nitrogen forms about 78% of the air on earth. But plants do not use nitrogen directly from the air. This is because nitrogen itself is unreactive, and cannot be used by green plants to make protein. Nitrogen gas therefore, needs to be converted into nitrate compound in the soil by nitrogen-fixing bacteria in soil, root nodules or lightning. To understand the cycle better, let us consider the diagram below: 1.