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Effect of Clay Content in Soil on Boron Uptake and Yield of Wheat¹

ABSTRACT

The effect of total B content in soil on B uptake by wheat (Triticum aestivum L.) and its effects on yield were studied for three soil-sand mixtures at soil-to-soil + sand ratios of 1:3, 2:3, and 1. The results indicate that the higher the clay content of a soil, the lower is the B activity in solution for any given amount of B added. It was suggested that the soil adsorption sites act as a pool to which B can be stored or removed depending on the change in solution B concentration in soil. The B uptake by the plants is higher as the sand content increases, for any total amount of B added. However, the experimental results from all three soil-sand mixtures lie on the same line when the B content in the shoot is plotted against B activity in soil solution (r² = 0.9695). The dry matter of the plants was decreased with both an increase in total amount of B added and an increase in the sand content for any given amount of total B. As found for B uptake, the relative dry matter weight and the relative yield values lie on the same linear line when they are plotted against B activity in soil solution from all three soil systems. This indicates that the yield responds to B activity in soil solution only.

¹ Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. No. 1326-E, 1984 series.

² Soil Scientist, Institute of Soils and Water, ARO, The Volcani Center, Bet Dagan, Israel; Professor, Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521, and Soil Scientist, U.S. Salinity Laboratory, 4500 Glenwood Dr., Riverside, CA 92501, respectively.

Received for publication December 17, 1984. Accepted for publication June 25, 1985.

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