Effect of Liming a Highly Al-saturated Soil on the Top and Root Growth and Soybean Nodulation1
- J. B. Sartain and
- E. J. Kamprath2
Relatively little information is available on the effects of liming on roots as compared with tops. To study the effect of various Al saturations on the growth of tops, roots, nodules, and nutrient accumulation of soybeans (Glycine max L.), several rates of lime were added to an acid soil in a greenhouse experiment. Dry weight of tops increased as the Al saturation was decreased by liming. Total dry weight and length of roots were unaffected by the soil treatments. Primary root weight was increased by liming. Root morphology, however, changed in that the lateral root weight decreased and the length per gram fresh weight of lateral root increased with decreasing Al saturation. Liming promoted the formation of a larger number of small diameter lateral roots. Nodulation, best expressed by nodule number, increased with liming and was highly correlated with the Ca content of the primary root.
Top dry weight was significantly correlated with the K concentration of the tops, Ca and Al concentration of the nodules, Mg concentration of the root mass, and the Zn concentration of the primary root. Total uptake/cm of root and equivalent elemental ratios were not as highly correlated with growth as concentration. Nodule number was significantly correlated with the total Ca and P content of the primary root, total P and Mg content of nodules, and the Ca/Al ratio of the nodule.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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