scholarly journals Exponential fertilization of Pinus monticola seedlings: nutrient uptake efficiency, leaching fractions, and early outplanting performance

2005 ◽  
Vol 35 (12) ◽  
pp. 2961-2967 ◽  
Author(s):  
R Kasten Dumroese ◽  
Deborah S Page-Dumroese ◽  
K Francis Salifu ◽  
Douglass F Jacobs
Keyword(s):  
Nutrient Uptake ◽  
N Uptake ◽  
Morphological Characteristics ◽  
Nutrient Status ◽  
First Year ◽  
Pinus Monticola ◽  
Uptake Efficiency ◽  
Greenhouse Culture ◽  
Exponential Fertilization ◽  
Nutrient Uptake Efficiency

We evaluated nutrient uptake efficiency and subsequent leaching fractions for western white pine (Pinus monticola Dougl. ex D. Don) seedlings grown with exponentially increasing or conventional (constant) fertilization in a greenhouse. Conventional fertilization was associated with higher leachate electrical conductivity and greater nutrient losses, which were more pronounced for the more mobile NO3-N than for NH4-N. Exponential fertilization increased seedling nitrogen (N) uptake efficiency (75%), which helped reduce leaching losses compared to conventional fertilization (50%). Although exponentially fertilized plants received 45% less fertilizer (20 mg N·plant–1) during the establishment and accelerated growth phases compared with conventional cohorts (36 mg N·plant–1), seedling morphological characteristics and nutrient status were similar at the end of greenhouse culture and after 2 years of growth in the field, except that exponential fertilization increased root volume after the first year and also increased ectomycorrhizal colonization. Reduction of applied fertilizer quantities and enhanced fertilizer uptake efficiency through exponential fertilization allows for production of high-quality seedlings while simultaneously minimizing fertilizer inputs and mitigating potential environmental contamination.

scholarly journals Effect of Different Levels of Urea Super Granule and Prilled Urea on the Crop Quality, Nutrient Uptake and Soil Nutrient Status of Broccoli

2018 ◽  
Vol 15 (2) ◽  
pp. 24-39 ◽  
Author(s):  
M J Hussain ◽  
A J M S Karim ◽  
A R M Solaiman ◽  
M S Islam ◽  
M Rahman
Keyword(s):  
Nutrient Uptake ◽  
N Uptake ◽  
Nutrient Status ◽  
Comparative Performance ◽  
Chlorophyll Contents ◽  
Post Harvest ◽  
Uptake Efficiency ◽  
Prilled Urea ◽  
N Uptake Efficiency ◽  
Β Carotene

A field experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during the period 2010-2011 to assess the effect of urea super granule (USG) and prilled urea (PU) on the quality attributes (Compactness coefficient, Vitamin C, β-carotene and chlorophyll contents) of broccoli, to assess the comparative performance of USG and PU on nutrient uptake and uptake efficiency of broccoli plant, to assess the effect of different forms and levels of urea N on the post harvest soil nutrient status of broccoli field and to select the better doses of USG and PU for quality broccoli production in Shallow Red-Brown Terrace Soil under Madhupur Tract (AEZ-28). The experiment was laid out in a randomized complete block design with three replications having 17 treatments constituted with different levels of urea super granule (USG) and prilled urea (PU) as- T1: N-control,  T2: PU-N80, T3: PU-N100, T4: PU-N120, T5: PU-N140, T6: PU-N160, T7: PU-N180, T8: PU-N200, T9: PU-N220, T10: USG-N80, T11: USG-N100,  T12: USG-N120, T13: USG-N140, T14: USG-N160, T15: USG-N180, T16: USG-N200, T17 and USG-N220 kg ha-1. Results revealed that the comparative performance of USG in relation to head quality (compactness coefficient, ascorbic acid, β-carotene and chlorophyll content), nutrient (NPKS) uptake and N uptake efficiency was found better as compared to PU. The compactness coefficient, β-carotene and chlorophyll contents were increased with increasing rate of N as well as USG and PU, but ascorbic acid content was slightly decreased with increasing rate of USG and PU. The maximum compactness coefficient (18.61) was found from the treatment USG-N180 that was followed by USG-N160 (18.24) and the highest β-carotene content (0.401 mg/100gFW) was found from USG-N160 followed by PU-N180 (0.40 mg/100gFW). Similarly the highest chlorophyll-a content (0.818 mg/100gFW) was found from USG-N180 followed by USG-N160 (0.814 mg/100gFW) and the highest chlorophyll-b content (1.141mg/100g FW) was recorded from USG-N180. The higher nutrient uptake and N uptake efficiency (108.531%) was obtained from USG treated plots over that of the PU. But N uptake efficiency was decreased with increasing rates of N fertilizer. But post harvest soil nitrogen status did not show any systematic trend although it was found higher in USG over PU. Similarly no remarkable changes were observed in post harvest soil P, K, S and B status for the crop. However, USG @ 160 kg N ha-1 (USG-N160) followed by USG-N140 and PU @ 180 kg N ha-1 (PU-N180) with other recommended doses of fertilizer could be suggested as USG and PU based fertilizer recommendation for a good quality broccoli production in terms of yield and quality in Silty Clay Loam Soil of Madhupur Tract.The Agriculturists 2017; 15(2) 24-39 

A comparison between pulse and constant rate additions as methods for the estimation of nutrient uptake efficiency in-streams

2010 ◽  
Vol 388 (3-4) ◽  
pp. 273-279 ◽  
Author(s):  
Marta Álvarez ◽  
Lorenzo Proia ◽  
Antonio Ruggiero ◽  
Francesc Sabater ◽  
Andrea Butturini
Keyword(s):  
Nutrient Uptake ◽  
Uptake Efficiency ◽  
Constant Rate ◽  
Nutrient Uptake Efficiency

scholarly journals ROOT MORPHOLOGY AND NUTRIENT UPTAKE KINETICS BY AUSTRALIAN CEDAR CLONES

2016 ◽  
Vol 29 (1) ◽  
pp. 153-162 ◽  
Author(s):  
RAQUEL OLIVEIRA BATISTA ◽  
ANTONIO EDUARDO FURTINI NETO ◽  
SOAMI FERNANDA CAIO DECCETTI ◽  
CASSIANO SILVA VIANA
Keyword(s):  
Nutrient Uptake ◽  
Root Morphology ◽  
System Development ◽  
Morphological Characteristics ◽  
Average Diameter ◽  
Uptake Efficiency ◽  
Root System Development ◽  
Randomized Design ◽  
Kinetics Of

ABSTRACT: Evaluation of root morphology and kinetic parameters assist in the characterization of genotypes in nutrient uptake efficiency. This study characterized Australian cedar clones concerning their nutrient uptake capacity at the seedling stage through root morphology and the kinetics of P, K, Ca, and Mg uptake. The experiment was conducted using a nutrient solution in a greenhouse and growth chamber. Four Australian cedar clones (HE, XF, XD, and XE), provided by Bela Forest View (Empresa Florestal Bela Vista), were tested using a completely randomized design with five repetitions, totaling 20 experimental plots. The length, volume, surface area, average diameter, and root length per diameter class, as well as the uptake parameters Vmax, Km, Cmin, and the estimated inflow of P, K, Ca, and Mg, were determined. The root morphological characteristics varied between Australian cedar clones; clone XD exhibited the largest root system development. The uptake efficiency of P, K, Ca, and Mg varied between cedar Australian clones. When availability differed, clones XE and XF exhibited greater plasticity in the uptake of P and K respectively, and similar results were found for clone HE in the uptake of Ca and Mg.

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