Pecan Leaf Elemental Sufficiency Ranges and Fertilizer Recommendations

Smith, Michael W.; Rohla, Charles T.; Goff, William D.

doi:10.21273/horttech.22.5.594

Cited by 16 publications

(25 citation statements)

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“…Foliar P concentrations followed a quadratic trend, decreasing from 2015 to 2016, and then increasing from 2016 to 2017. Foliar Mg and S had linear or quadratic trends over the years, but Mg concentrations were within the recommended range (Smith et al, 2012); therefore, they were not considered biologically significant. Zinc is the micronutrient of most concern in pecan production, but it did not change over the years.…”

Section: Resultsmentioning

confidence: 99%

“…Zinc was unaffected by the year. Of the elements that changed over time, only P, K, S, and Fe had levels lower than the ranges of sufficiency, and they were potentially biologically significant (Smith et al, 2012). Foliar concentrations of B increased linearly by 10%, whereas Cu decreased linearly by 13% with the increasing P rate (Table 10).…”

Section: Resultsmentioning

confidence: 99%

“…Each band measured 6 m (20 ft) long and was 10 cm (4 inches) wide. No other sources of P were applied for the duration of the experiment, but broadcast applications of N and K were applied to maintain or achieve the recommended foliar concentrations (Smith et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

“…Foliar samples were collected from all experimental trees once per year on 20 July 2015, 2016, and 2017, which falls within the standard recommended time for the collection of foliar samples (Smith et al, 2012;Wells, 2007). Samples were collected from both the south (treated) and north (untreated) sides of the canopy.…”

Section: Methodsmentioning

confidence: 99%

“…Recommendations for adequate foliar P concentrations in pecan vary; however, observations have shown that visual symptoms of P deficiency can be expected at foliar concentrations less than 0.11% (Alben, 1947;Sparks, 1978Sparks, , 1986. The current standard recommendation for adequate foliar P is 0.14% (Smith, 2010;Smith et al, 2012). Pecan fertilizer recommendations are often based on a combination of the current year's soil test data and the previous year's foliar nutrient concentration data, with the latter considered more important.…”

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confidence: 99%

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Long-term Response to Phosphorus Banding in Irrigated and Nonirrigated Pecan Production

Polozola¹,

Wells²,

Kessler³

et al. 2019

horts

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An experiment was conducted to determine the effects of banded phosphorus (P) applications at differing rates in irrigated and nonirrigated pecan (Carya illinoinensis) plots on P movement within the soil, P uptake and movement within pecan trees, and the yield and quality of nuts. On 20 Mar. 2015, P applications of 0 kg·ha−1 (0×), 19.6 kg·ha−1 (1×), 39.2 kg·ha−1 (2×), and 78.5 kg·ha−1 (4×) were administered to bands of triple superphosphate to randomly selected trees in nonirrigated and irrigated plots of a ‘Desirable’ orchard bordered by ‘Elliot’ trees. When P was applied at the 2× and 4× rates, the total soil test P decreased linearly by 35% and 54%, respectively, in nonirrigated plots and by 41% and 59%, respectively, in irrigated plots over the course of the experiment. There was no change in soil test P over time at the 0× rate for either irrigation regimen; however, at the 1× rate, soil test P decreased 44% in the irrigated plot but did not change in the nonirrigated plot. The largest linear decrease of the soil test P from the start of the experiment to the end of the experiment occurred in the top 0 to 7.6 cm. In contrast, soil test P at a depth of 15.2 to 22.9 cm decreased linearly by 23% in the nonirrigated plot, but it did not decrease over time in the irrigated plot. Increasing the P application rate increased foliar P quadratically in the nonirrigated plot, but only the 4× application rate increased foliar P compared with the 0× control. In the irrigated plot, foliar P concentrations decreased linearly from 2015 to 2017, and foliar P concentrations were not influenced by the P application rate. No differences in pecan yield or quality were observed in either irrigated or nonirrigated plots. Overall, P banding may not be the most sustainable way to increase foliar concentrations of P quickly or to maintain concentrations of the nutrient in the long term.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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