An experiment to determine the effect of concentration of boron in irrigation water on tissue Ca/B ratio and yield of lentil, barley and oats is described and the results discussed. Tissue Ca/B ratio is a better index for detecting B toxicity in plants. The grain and straw yield of lentil and barley decreased on and beyond 3 and 6, and 6 and 8 mg B/1 in irrigation water, respectively, but there was no effect on green fodder yield of oats.
During laboratory studies it was noted that water-soluble carbonate plus bicarbonate interferes with the determination of gypsum requirement (GR) by Schoonover's method and has significant correlation with the latter (r = 0.89). The interference of carbonate and bicarbonate can be eliminated through their precipitation as magnesium carbonate. A modified method to this effect is suggested hereby, and values of GR determined by this method are quite close (r = 0.99) to those of exchangeable sodium and give a fair approximation to it.
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