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EFFECT OF LIMING ON THE DISTRIBUTION OF ALUMINUM AND ALUMINUM UPTAKE BY MAIZE GROWN IN A COARSE TEXTURED SOIL
Abstract
The phytoavailability of aluminum (Al) in Al-ri ch acid podzolic soils is of particular concern in many Quebec agricultural areas due to its toxic effect on plant growth. Liming materials may mitigate Al phytoavaila bility and toxicity depending on Al pool and plant part, respectively. Our objective was to determ ine the effect of dolomitic limestone on the distribution of Al species in soil and to evaluate the uptake and distribution of Al in the different parts of maize ( Zea mays L.). Maize was grown in 40- cm high and 15-cm di ameter columns filled with Mo rin series loamy sand [Orthic Humo-Ferric Podzol (Haplorthod)]. The amount of exchangeable Al (1 M MgNO3, pH 7) was very low (< 0.6%). Exchangeable and carbonate fractions represented less than 9 % of total Al. Most Al was in the oxide fraction (63%). Exchangeable soil Al (Al-exch) was the most significantly affected by liming. Al-exch was negatively correlated with soil Ca-exch and Mg-exch (0.5 M BaCl2-TEA, pH 8.2) (r = -0.914*** and -0.944***, respectively), soil pH (r = -0.958***) and concentrations of Ca in stems (r = -0.960***), leaves (r = -0.920***), flowers (r = -0.660**), ears (r = -0.850***) and roots (r = - 0.881***). On other hand, Al-exch was positively correlated with concentration of Al in stems (r = 0.754**), leaves (r = 0.936***), flowers (r = 0.926***), ears (r = 0.825***) and roots (r = 0.925***). Plant roots accumulated more Al than shoots. After corn harvest, soil pH ranged from 5.4 (without limestone) to 6.4 (highest limestone rate). Liming soil to pH 6.4 maximized shoot biom ass yield while reducing Al-exch to 0.13 cmol c/kg and the ratio of Al-exch to exchangeable Ca+Mg to 0.01 in the 0-10 cm soil layer. Tissue Al concentrations ranged from 10.7 to 34.7 mg/kg in stems and from 25.9 to 57.1 mg/kg in leaves, well below the critical toxicity limit of 80 mg/kg for most agricultural crops, whatever soil pH and the level of Al-exch.
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