EFFECT OF SOIL TEMPERATURE AND MOISTURE ON YIELD AND NUTRIENT UPTAKE BY BARLEY

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Abstract
In a field experiment yields of barley were lower, regardless of moisture, when the mean minimal soil temperature was near 27 °C than near 9 °C or 18 °C. The highest yields were obtained at 18 °C. Application of fertilizer increased final yields and uptake of N, P, and K at 9 °C and 18 °C but not at 27 °C. At 9 °C and 18 °C response to added fertilizer occurred as the moisture content of the soil was raised from near the wilting point to field capacity. During the early stages of growth an increase either in temperature or moisture increased the uptake of N, P, and K. Percentage P in the plant material during early growth was related to yield near heading stage when soil temperature conditions were considered. The protein content of the grain was increased at the higher soil temperature for all moisture conditions.

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