SULFUR FERTILIZATION OF WHEAT AND TRITICALE FOR FORAGE PRODUCTION

Throughout the Great Plains, wheat (Triticurn aestivum L.) is utilized for grain and forage production. Triticale (Triticum aestivum L. x Secale cereale L.) is known for its ability to produce large quantities of high quality forage. With recent improvement in winter hardiness, interest in and acreage of triticale is spreading north in the central Great Plains. The forage production potential of wheat and triticale is essential to many livestock producers. Very few data are available concerning the effects of sulfur (S) fertilization on production and quality of wheat or triticale forage. Greenhouse research was conducted to evaluate the addition of S as either ammonium thiosulfate (ATS) or ammonium sulfate (AS) on production and quality of wheat and triticale forage on four different soils. Sulfur fertilization increased forage yields and S concentrations of both crops on all soils, and in many cases, resulted in higher N concentrations in the forage. Sulfur fertilization also increased in vitro digestibility of wheat, but had little effect on triticale digestibility. Both S sources performed similarly. Application of S after the first clipping was effective in increasing second clipping forage production on three of the four soils, and forage S concentrations were dramatically increased for both crops on all soils. Although the magnitude of response varied, S fertilization was effective in increasing production and quality of wheat and triticale forage grown in the greenhouse.