Similarly a fertiliser for feeding grass in the spring will be high in nitrogen. To remain healthy, plants also need other nutrients, such as calcium (Ca), sulphur (S) and magnesium (Mg), as well ...

THE direct utilization by higher plants of nitrogen fixed by blue-green algae could play a substantial part in the Earth's nitrogen cycle. That certain species of blue-green algae can fix nitrogen ...

Manures and other organic residuals (e.g., biosolids, food processing wastes) and many commercial fertilizers available to producers contain nitrogen (N). Nitrogen is an important plant nutrient that ...