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Estimation of yield of silage maize dry matter from volume harvested or by sampling harvester trailer loads


Journal of Agricultural Engineering Research 57(3): 207-212
Estimation of yield of silage maize dry matter from volume harvested or by sampling harvester trailer loads
The DM yield of a crop of silage maize can be calculated from the vol. of the harvested material and the DM density; the latter is defined as kg of DM/msuperscript 3 of freshly harvested material in a trailer. To test the accuracy of this procedure the value of the DM density of silage maize in a trailer at harvest and the factors influencing this density were studied. The standard deviation of the DM density of a random load of maize in a trailer was 11.2 kg/msuperscript 3. The 95% confidence interval was 112+or-22.5 kg/msuperscript 3. Of the variance of the DM density, 40% was attributable to differences between years, 34% to differences between fields within a year, 12% to differences between trailers within a field and 14% to differences between loads of maize within a trailer. Neither the DM content of the maize nor the height of the maize in the trailer was useful for predicting the DM density. This density was not affected by brand or type of field chopper, chopping length or the use of a kernel crusher. The way in which the trailer was filled had a small (2 - 3%) effect on the DM density. When the DM density of a single load of maize was measured, the limits of the 95% confidence interval were +or-10.5% of the mean DM density; for a sample consisting of 10 loads of maize the limits of the 95% confidence interval were +or-3.3% of the mean.


Accession: 002373532

DOI: 10.1006/jaer.1994.1020



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