Straw recovery as affected by wheat harvest method
1988
Allen, R.R.
Wheat dry matter yield and the portions potentially recoverable for energy conversion by different harvesting methods were investigated at Bushland, TX, from 1979 through 1983. Wheat was managed with varying amounts of irrigation to achieve both medium and high dry matter production levels. Where all dry matter was removed by hand and threshed, the grain, straw, and chaff fractions averaged about 40, 50, and 10%, respectively, of the total material. When clipping samples at a simulated combine harvesting height (about 36 cm), the remaining stubble amounts ranged from 1700 to 3400 kg/ha for grain yield levels of 3400 to 6700 kg/ha. When the stubble was swathed and baled after conventional combine harvesting, baled straw weights ranged from 1900 to 2400 kg/ha (15 to 17% of total dry matter). Up to 3700 kg/ha of stubble remained for erosion protection after swathing and baling. Where the combine cutter-bar was operated near ground level (5 to 7 cm) and all straw discharge was caught (whole plant combining), catchings ranged from 4600 to 6000 kg/ha, or 2.5 times greater than with conventional combining and baling.
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