Graduate Thesis Or Dissertation
 

The effect of precipitation variation and fertilization level on the nutritive value of wheat residue

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  • Five simulated precipitation patterns characteristic of the Columbia Basin and Plateau region and six fertilization rates were evaluated for their effect on percent crude protein, percent in vitro dry matter digestibility, fiber content, and yield of wheat aftermath on a commercial farm in north central Oregon. The higher moisture regimes showed the greatest increase in percent crude protein with increasing nitrogen fertilizer levels. Chaff and straw values were significantly higher for the dry fallow-normal crop precipitation pattern than for normal fallow-dry crop pattern and significantly higher for the wet fallow-normal crop pattern than for normal fallow-wet crop. Percent in vitro dry matter digestibility also increased under the high moisture precipitation patterns and there was a positive relationship between fertilization level and digestibility. The digestibility values for chaff and straw were higher for the dry fallow-normal crop precipitation regime over the normal fallow-dry crop only at the higher fertilization levels. Examination of wet fallow-normal crop vs. normal fallow-wet crop showed increased digestibility for the pattern receiving more moisture in the fallow period, also at only the higher fertilization levels. This study indicated that higher moisture regimes resulted in increased straw and chaff yields. Although not significant for every precipitation pattern, there was indication of a positive relationship between fertilization level and straw and chaff yields. For both straw and chaff yield, no difference was seen when comparing dry fallow-normal crop and normal fallow-dry crop regimes. Testing wet fallow-normal crop vs. normal fallow-wet crop patterns revealed increased chaff yields at higher fertilization levels under the pattern receiving less moisture in the fallow period, but increased straw yields at higher fertilization levels under the pattern receiving more moisture in the fallow period. Percentages of acid detergent fiber, lignin, and cellulose were not significantly affected by precipitation variation or level of fertilization. The fertilization by precipitation pattern interaction was not a significant source of variation, with the exception of percentage crude protein of wheat straw in the first year.
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