Abstract
Cultivar and fertilization effects on plant and silage crude protein contents of forage maize
This research was conducted to determine the effects of organic and inorganic fertilizer treatments (organic, inorganic, ½ organic + ½ inorganic) on plant and silage crude protein contents of hybrid corn cultivars (PR 31Y43, OSSK-644 and Lacasta) in the years 2011 and 2012 under the ecological conditions of Eskipazar-Karabük. The fertilizer treatments were statistically significant on plant crude protein and plant crude protein yield in both research years. While the fertilizer treatments were statistically significant on the silage crude protein in the first year, they were statistically significant on dry stem ratio and silage crude protein in the second research year. The highest values were obtained from inorganic and ½ organic + ½ inorganic fertilizer treatments. The fertilization treatments x hybrid corn cultivars interactions were statistically significant on the plant and silage crude protein in the first research year. The highest plant crude protein was obtained from ½ organic + ½ inorganic x Lacasta interactions and from Lacasta, OSSK-644 and PR 31Y43 interactions of the inorganic fertilizer treatments. On the other hand the highest silage crude protein was obtained from ½ organic + ½ inorganic x Lacasta and inorganic x Lacasta interactions. As a result of the research, the highest plant crude protein yield was obtained from inorganic and ½ organic + ½ inorganic fertilizer treatments. When we consider the sums paid for the export of inorganic fertilizers and the negative effects of these inorganic fertilizers on human and environmental health, we may see that ½ organic + ½ inorganic fertilizer treatments would be preferable in the silage corn growing.
Keywords
Crude protein, organic and inorganic fertilization, silage corn cultivars
