In contrast, the uptake of phosphorus increased to a maximum after the rates of water, nitrogen and potassium had begun to decline, and appeared to be closely related to solution temperature. These ratios decline as the rates of uptake increase and reach a minimum during the afternoon. Maximum rates of uptake of indeterminate tomato plants under glass at low and high light intensities and the ratios at which nutrients and water are absorbed. During the uptake period concerned. The uptake of chloride by tomatoes generally exceeds that of sodium.
Good aeration is essential for healthy root growth and for efficient uptake of nutrients.
Measurements of the oxygen content of the nutrient solution in the root mat showed that the oxygen concentration declined to a minimum during the brightest part of the day. This response was closely related to solution temperature. Conclusion Recirculating nutrient solutions provide a useful system for studying the effects of the stage of plant growth and of the environment on the rates of nutrient uptake by mature plants and on oxygen depletion in the root mat. This information is provided as a public service, but we cannot guarantee that the information is current or accurate. Readers should verify the information before acting on it.