Abstract
Bluegrass plants grown at 15[degree], 25[degree], and 30[degree] C in sand cultures produced at 15[degree] a tall, succulent, bushy top growth with many leaves and at 35[degree] an erect, non-succulent, short top growth with few leaves. Root systems of low-temp. plants were large, white, succulent, and coarsely branched; roots of high-temp. plants were slender, light brown, and densely tufted. Nitrate-supplied plants were superior in leaf and root development to ammonium plants over a pH range of 4.5 to 6.5. Under constant temp. and pH, plants supplied with nitrate and ammonium nutrition and clipped weekly at 1- and 2-inch heights showed greater yields with nitrate nutrition than with ammonium. Yields over a period of 11 weeks were greatest at a clipping height of 2 inches.
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