Abstract
The boron absorption by sunflowers in the greenhouse from samples of the genetic horizons of eight Ontario soils increased with increasing water-soluble boron content (R2 = 0.78). The absorption from a group of 17 cultivated surface samples was also positively correlated with water-soluble boron (R2 = 0.54).Clay content had the greatest influence on boron absorption after the influence of water-soluble boron was removed. The two variables in a multiple curvilinear regression accounted for 79% of the variability in absorption from the cultivated surface samples. The absorption increased with increasing clay content up to 15% and then decreased with a further increase in clay up to 20%. Organic matter content had a lesser effect on absorption. The [Formula: see text]-atm moisture value had a relatively large influence on absorption from the profile samples, but essentially no influence on that from the surface samples. The pH and CaCO3 content had very little influence on absorption from either set of samples.
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