As a rule, a healthy lawn with good soil needs 1 to 2 kg of nitrogen per 100 m every year. Leave grass clippings on the lawn to return about 1 kg of nitrogen per 100 m to the lawn, and reduce weeds and moisture loss. Direct water to the root system. In the case of trees and shrubs, the roots that take up the most water are generally located within the top 30 cm of the soil and near and even beyond the drip line. This is the area directly below the outer tips of the branches.
Plants have different watering requirements at various stages of their growth.
For example, in the first year of planting, trees need about 2 to 3 cm of water once a week. During the next four years, they need 2 to 3 cm of water every 2 to 3 weeks. Generally, mature trees require about 2 to 3 cm of water once a month. Again, if Mother Nature is providing at least this amount of moisture, supplemental watering should not be necessary. But moisture requirements depend on a range of factors, including soil type and species.