Boron Uptake by ‘Bartlett’ Pear Trees as Influenced by Soil Retention and Leaching1

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Abstract
Boron was applied to the surface of 3 southern Washington soils at rates of 0, 3.4, 6.7, and 13.4 kg/ha. Levels of hot-water-extractable B were measured annually to a depth of 90 cm for 3-5 years following application. Soils ranged from medium to high in B retention capacity. Once the B retention capacity of the soils was satisfied, additional B leached readily through the profile. The same amounts of B were applied to the same soil types in 3 commercial pear orchards to determine the effects on plant uptake. Blossom, leaf, and fruit levels of ‘Bartlett’ pear (Pyrus communis L.) were little affected by the applications, even though the extractable soil B levels were high. This failure to obtain uptake may be explained by dry soil conditions and reduced root activity resulting from low rainfall and low soil temperatures.

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