Pecan leaf analysis: I. Varietal, fertilizer, and seasonal effects

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Abstract
Differences in elemental content of pecan [Carya illinoensis (Wang.) K. Koch] leaves among cultivars were found for N, P, K, Ca, Mg, Mn and Zn. Only leaf K indicated a date by cultivar interaction. Differences in leaf K among cultivars became greater as the season progressed. increasing rate of application of N-P-K fertilizer increased leaf N, Ca, Mn and Al, but had very little or erratic effect on leaf P, K, Fe, B, Cu, Zn and Sr. There were very few consistent significant fertilizer rate by date interactions for the 13 elements tested. Seasonal trends for element leaf contents during mid-May-Oct. were generally downward for N, upward for Ca, Mn, Fe, B, Cu, Al and Ba, and changed very little for Mg, Zn and Sr. Leaf P and K responses to sampling date varied with year. Large year to year variations in leaf trends over dates suggests difficulty in selecting a period for leaf sampling where little change in leaf levels consistently occurs.