Effect of fertilization of a crowley clay loam on the chemical composition of forage and carpet grass, Axonopus affinis
1943
Fraps, G.S. | Fudge, J.F. | Reynolds, E.B.
Protein, phosphoric acid, and lime were determined in total forage and carpet grass clipped at monthly intervals through two growing seasons in 1938 and 1939 from plots of a Crowley clay loam at Beaumont, Texas, which had received six different fertilizer treatments with and without lime. Unfertilized carpet grass and forage were often deficient in phosphoric acid, less frequently in protein, and not at all in lime. Sodium nitrate produced a significant increase in yield but did not affect the chemical composition of total forage or carpet grass. Ammonium sulfate alone increased the yield of forage to some extent but had little effect on chemical composition. Muriate of potash had no effect upon either the yield or chemical composition. Superphosphate greatly increased the yield and the protein, phosphoric acid, and lime content of total forage and of carpet grass. It decreased the number of samples which were deficient in phosphoric acid for animal production. Lime alone increased yield of forage 45 to 53%. It also increased the protein, phosphoric acid, and lime in the total forage and in carpet grass. Variations in yield and chemical composition were much greater with different dates than with different fertilizer treatments. Protein and lime decreased from early spring until July and increased from then until late fall. Phosphoric acid was high in the early spring samples and then fairly constant throughout the remainder of the growing season. Rainfall in 1939 was sufficiently lower than that in 1938 to cause a large reduction in yield, but the difference in rainfall did not significantly affect the chemical composition of forage or carpet grass.
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