Balance between Potassium and Phosphorus in the Nutrition of Barley

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Abstract
In K × P interaction experiments with barley, treatments can usually be found in which the plants appear to be balanced between the two types of deficiency symptoms. These treatments favour dry weight and grain production. It is not known whether internal parameters of the health of barley tend to have similar optima. From the results of a water-culture experiment, a comparison was made of the patterns of response exhibited by various parameters of the health and growth of barley. Since the patterns did not correspond with each other very closely, it was concluded that external indications of the balanced state are not necessarily the product of optimal internal conditions. It was also considered whether a simple definition of a balanced nutrient solution could be achieved by reference to relationships between dry weight and either nutrient supply or nutrient uptake. Such a definition might have helped to reduce the subjectivity in the use of this term, but no basis was found for sound generalizations along these lines.

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