Distribution of 15N-Labeled Fertilizer Applied to Pecan: A Case Study

Kraimer, Rebecca A.; Lindemann, W. C.; Herrera, Esteban A.

doi:10.21273/hortsci.36.2.308

Cited by 18 publications

(31 citation statements)

References 19 publications

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“…However, Li et al (2003) reported that a water limitation and a high N level can lead to a poor N efficiency for spring wheat. Moreover, low soil moisture can adversely affect fertilizer mobility in the soil, leading to a decrease in its uptake by the plant (Kraimer et al, 2001;Yuan et al, 2005). In the present study, the soil water status affected the N ratio between the fertilizer and soil, showing that a water deficit decreases the proportion of N derived from the fertilizer, while increasing N derived from the soil.…”

Section: Discussionmentioning

confidence: 51%

Nitrogen Translocation in Wheat Plants Under Soil Water Deficit

Wang

2006

Plant Soil

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Accumulation and translocation of nitrogen (N) in the vegetative organs and grains of winter wheat (Triticum aestivum L.) are important processes in determining yield and quality. The present study was conducted to compare the effects of water deficit and cultivars (cv. Lumai 21 and Jinan 17) on N translocation from vegetative organs to grains in a mobile rain-shelter using 15 N-labeled ammonium sulfate fertilizer. The N translocation amounts (defined as the difference between the N amount at anthesis and the N amount at maturity for a vegetative organ) in leaves were greatest for the two cultivars, followed by glumes, stems, and sheaths, respectively. The N translocation ratio (defined as the ratio of the translocation amount to N amount at anthesis) in total above-ground parts were greater for Lumai 21 (0.65 g g )1 DW) than for Jinan 17 (0.60 g g )1 DW), and Lumai 21 plants had a higher N translocation ratio for the N derived from fertilizers. The N contribution (defined as the ratio of the translocation amount to grain N amount) of total vegetative parts aboveground to grain N ranged from 0.50 to 0.77 g g )1 DW, and that of the leaf was the greatest. The results showed that water deficit remarkably increased the N translocation ratio derived from soil and the contributions of N in various vegetative organs to grain N. It is suggested that water deficit would weaken the availability of fertilizer N but enhance the remobilization of prestored N to the grains.

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Section: Discussionmentioning

confidence: 51%

Nitrogen Translocation in Wheat Plants Under Soil Water Deficit

Wang

2006

Plant Soil

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“…Tree weights of the three destructively sampled trees averaged 2% less than weights predicted by equations of King and Schnell (1972), indicating that tree weight was estimated with reasonable accuracy by the equations. Kraimer et al (2001) reported that tree weights of pecan were 8.6% less than the weight estimated using King and Schnell's equations. Our tree weights may agree more closely with the calculated weights because the trees of Kraimer et al (2001) were hedged, whereas ours were not.…”

Section: Methodsmentioning

confidence: 90%

“…Biomass of the perennial tree components was estimated using equations of King and Schnell (1972). These equations were used by Kraimer et al (2001) to estimate pecan weight in a New Mexico study. To confirm these equations and develop an equation to estimate leaf mass, three 15-year-old 'Maramec' trees spaced 10.7 × 10.7 m apart, growing on a Port silt loam (fine-silty, mixed, superactive, thermic Cumulic Haplustolls) at the Pecan Research Station near Sparks, Okla. were harvested on 16 to 23 Oct. 1998.…”

Section: Methodsmentioning

confidence: 99%

Influence of Nitrogen Application Time on Nitrogen Absorption, Partitioning, and Yield of Pecan

Acuña-Maldonado¹,

Smith²,

Maness³

et al. 2003

jashs

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Nitrogen was applied to mature pecan (Carya illinoinensis Wangenh. C. Koch.) trees annually as a single application at 125 kg·ha-1 N in March or as a split application with 60% (75 kg·ha-1 N) applied in March and the remaining 40% (50 kg·ha-1 N) applied during the first week of October. Nitrogen treatment did not affect yield, and had little effect on the amount of N absorbed. Nitrogen absorption was greater between budbreak and the end of shoot expansion than at other times of the year. Substantial amounts of N were also absorbed between leaf fall and budbreak. Little N was absorbed between the end of shoot expansion and leaf fall, or tree N losses met or exceeded N absorption. Pistillate flowers and fruit accounted for a small portion of the tree's N; ≈0.6% at anthesis and 4% at harvest. The leaves contained ≈25% of the tree's N in May and ≈17% when killed by freezing temperatures in November. Leaves appeared to contribute little to the tree's stored N reserves. Roots ≥1 cm diameter were the largest site of N storage during the winter. Stored N reserves in the perennial parts of the tree averaged 13% of the tree's total N over a three year period. Current year's N absorption was inversely related to the amount of stored N, but was not related to the current or previous year's crop load.

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“…To estimate N storage pools and N distribution in different organs, the utilization of 15 N is the main method used in fruit trees (Kraimer et al, 2001). This procedure was used to study N dynamics in traditional blueberry varieties (Retamales and Hanson, 1989;Chuntanaparb and Cummings, 1980;Merhaut and Darnell, 1995).…”

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confidence: 99%

Absorption, distribution and accumulation of nitrogen applied at different phenological stages in southern highbush blueberry ( Vaccinium corymbosum interspecific hybrid)

Pescie

Borda

Ortiz

et al. 2018

Scientia Horticulturae

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A B S T R A C TSouthern highbush blueberry has an early harvesting and then a long period of vegetative growth until dormancy, compared to highbush and rabbiteye blueberries. Nitrogen requirements could be different because of this specific early harvesting. Absorption of 15 N enriched ammonium sulfate was compared at five phenological stages from bud swell to pre-dormancy in two years old plants of the cultivars Star and ÓNeal. Plants grown in pots were irrigated with ammonium sulfate solution ( 15 N). Five plants for each application date were excavated and separated in parts (roots, canes, leaves, flowers, fruits or floral buds). Samples were taken three weeks after application from bud swell to pre-harvest treatment, and three month after for post-harvest and pre-dormancy treatment. Each tissue were dried and weighed before and after, and analyzed for 15 N content, N content and N %....N%, and in leaves were also determined macro and micro nutrients. Nitrogen fertilization at bud swell is effective, even for the ÓNeal cultivarthat present floral bud break in absence of leaves. Post-harvest fertilization contribute N for summer vegetativegrowth which would influence the floral buds development next year, Nitrogenstorage at this time would led to the improved floral behavior next year. Nitrogen losses risk is lower at post-harvestfertilization.

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Distribution of 15N-Labeled Fertilizer Applied to Pecan: A Case Study

Cited by 18 publications

References 19 publications

Nitrogen Translocation in Wheat Plants Under Soil Water Deficit

Nitrogen Translocation in Wheat Plants Under Soil Water Deficit

Influence of Nitrogen Application Time on Nitrogen Absorption, Partitioning, and Yield of Pecan

Absorption, distribution and accumulation of nitrogen applied at different phenological stages in southern highbush blueberry ( Vaccinium corymbosum interspecific hybrid)

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