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23 To begin with, the grain sorghum was planted into last year's
residue of wheat and double-cropped soybeans. The residue levels are pretty
high as this is a no-till field. All we do is spray, plant, and harvest.
Sometimes we spray more than once for weed control, but we try and minimize
our costs of chemicals so that the cropping system is economical.
|Field view of recently planted grain sorghum|
|May 23, 2002|
|This graph shows daily rainfall over the preceeding three weeks. It also indicates runoff (the negative values in red) which we are measuring using a weir at the edge of the field. So "effective rainfall" will be the total rainfall minus the runoff value. If we arbirtraily use March 1 as the start of the season, then effective precipitation is: 5.4 inches.|