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  • Author or Editor: H.L. Malstrom x
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A 3-year field study was undertaken to determine variations within ‘Moneymaker’ pecans [Carya illinoensis (Wang.) K. Koch] as to oil quantity and fatty acid content of the kernel. Individual pecan trees bore irregularly over the 3-year period. Yields were inversely correlated with nut wt and total oil content and directly with refractive index and potassium concentration of the mature kernel. Six fatty acids were found in kernel oil but only palmitic, oleic, and linoleic were correlated to yield.

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Acidification of < 1% of the effective root zone of a mature pecan tree (Carya illinoensis (Wanghenh.) C. Koch) significantly increased uptake of Zn into the tree and maintained elevated Zn in leaves for 9 years. Sulfuric acid and ZnSO4, applied in a shallow trench, lowered soil pH to a depth of 60 cm and increased volubility of Zn in the acid band. Large concentrations of CaSO4 were formed. Laboratory tests confirmed the movement and volubility of Zn in soils under conditions similar to those in the field. Tree roots did not grow into the acidified band, presumably due to high salinity, but proliferated extensively at the interface of the acidified band and calcareous soil.

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