Aerifying larger lawns requires a power-driven core aerator or aerifier, which can be rented at lawn and garden supply centers. The working parts of these machines are spoon-shaped tines or hollow tubes. As the tubes are driven into the lawn, cores of soil are removed from the ground and strewn across the lawn.
Nutrients with the Highest Energy Density. Fat provides more calories than any other nutrient. The macronutrients -- fat, protein and carbohydrates -- are high in energy density, which means that they have 4 or more calories per gram. The other essential nutrients -- water, vitamins and minerals -- have no calories, so they provide no energy.
Nutrients are drawn from a wide variety of foods and the more varied your diet, the more likely you are to obtain all the nutrients you need. Energy is not a nutrient but, kilojoules (food energy) are important for providing energy for your daily activities. Protein, fats and carbohydrates are converted into energy in different quantities. Vitamins and minerals are also essential nutrients for the body, but they are not converted into energy.