In the warm, dry winter season in Africa, rivers dry up and become green puddles that are important feeding grounds for insects in the spring. Market gardeners apply the same principle when they put a small bag of chicken manure in a drum filled with water to make liquid manure. A good indicator that the nutrient is not too strong is that tiny water organisms like water fleas thrive on clean, nitrogen-enriched water. If the nitrogen in the liquid manure is too concentrated, then the conditions are not suitable for living beings, and the liquid manure can become too concentrated or polluted, so more fresh water should be added and the amount of chicken manure reduced. In this way, gardeners are able to provide nitrogen-enriched water for healthy plants and tiny animals living in the water, show the farmers that the concentration of nitrogen will support animals in the water as well as plant growth in the soil.