About Us | Help Videos | Contact Us | Subscriptions



This article in SSSAJ

  1. Vol. 29 No. 2, p. 187-191
    Received: Aug 3, 1964



Boron Concentration Adjacent to Fertilizer Granules in Soil, and Its Effect on Root Growth1

  1. J. J. Mortvedt and
  2. G. Osborn2



Rates of dissolution of B from granules of rasorite and three boronated fertilizers in limed Hartsells fine sandy loam decreased in the order: Nitric phosphate (2.2% B) > rasorite (20.2% B) ≫ calcium silicate slag (7.5% B) > calcium metaphosphate (2.1% B). Movement of B from the granules increased with B concentration gradient and soil moisture content.

Concentration of hot water-soluble B in soil near the granules at a given time depended on: (i) B content of the granule, and (ii) the relative rates of B dissolution from the granule and movement of B from the granule site. Concentrations of B near rasorite granules—as high as 80 parts per million (ppm) in a large volume (4 kg of soil in gallon cans) and 385 ppm in thin soil layers (80 g of soil in Petri dishes)—were inversely proportional to the amount of soil affected.

Root growth of oats and alfalfa was slightly depressed at soil B concentrations of 2 to 5 ppm, and markedly so at concentrations above 10 ppm B. Thus, high concentrations in soil near some B sources may inhibit root growth. Root injury may be prevented by decreasing the B content per fertilizer granule and by applying less soluble sources or lower amounts of B.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America