Influence of Soil Temperature and Nitrogen on Ryegrass Growth and Chemical Composition
1958
Parks, W. L. | Fisher, W. B.
Annual ryegrass was grown under controlled conditions at different rates of nitrogen fertilization. Alternating periods of 16 hours of light and 8 hours of darkness were maintained in growth chambers set at 10°, 20°, and 30°C. The ryegrass responded to nitrogen fertilization up to the rate of 100 pounds per acre and the response was greatest at the 20°C. temperature. Nitrogen was more efficiently utilized by the ryegrass at the 20° and 30°C. temperature than at the 10°C. temperature. The uptake of potassium, calcium, magnesium, and phosphorus was retarded at the 10°C. temperature. Phosphorus uptake and yield of forage were directly related and the calcium content of the ryegrass increased as the temperature and rate of nitrogen increased.
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