Clonal Variation in Photosynthesis, Foliar Nutrient Concentrations, and Photosynthetic Nutrient Use Efficiency in a Brazil Nut (Bertholletia excelsa) Plantation

Nutrient resorption efficiency of woody plants, litterfall and nutrient fluxes were investigated in a burned and an unburned cerrado plot between October 1997 and September 1999. A large experiment (Fire Project, Brasília, Brazil) on the effects of prescribed burnings was initiated in 1992. Cerrado plots were delimited and subjected to different fire regimes. Seasonal trend of litterfall was similar in both plots but the production in the burned plot was 42.2 g m−2 y−1 before the fourth prescribed fire (September 1998) and decreased by 22% 1 y after burning while in the unburned plot it was around 230 gm−2 y−1. Although nutrient concentrations in leaf litter were higher in the burned plot, the nutrient fluxes were 60–80% lower than in the unburned plot. Nutrient use efficiency (ecosystem level) was 4373 for P and 137 for N. Measured resorption efficiency for 10 cerrado species ranged from 14.5 to 37.2% for N and from 40 to 70.4% for P and in general, there were no differences between plots. N is in short supply, partly because of fire history, but the results, both at ecosystem and species levels (mean N/P in fresh leaves was 18), indicated a stronger limitation by P than by N.

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Nutrient use efficiency and utilisation in east coast Australian Eucalyptus forests

Australian Journal of Botany ◽

10.1071/bt18178 ◽

2019 ◽

Vol 67 (8) ◽

pp. 585

Author(s):

John Turner

Keyword(s):

Nutrient Availability ◽

High Efficiency ◽

Nutrient Use Efficiency ◽

Nutrient Concentrations ◽

P Availability ◽

Mixed Stands ◽

Available N ◽

Nutrient Use ◽

Use Efficiency ◽

The Difference

Nutrient use efficiency (NUE) has been used as a method to evaluate the utilisation and processes of cycling of nutrient in forests. In publications, different methods have been used to calculate NUE, but as efficiency they are all expressed as ratios and these cover the basic areas of: (1) absorption from the soil and uptake, (2) efficiency in their requirement or utilisation of nutrients including physiological efficiency and (3) efficiency in the retention and internal re-utilisation of nutrients. Few studies address NUE based on complete nutrient cycling information but use indices based on litterfall or foliage nutrient concentrations. In this study different expressions of NUE were defined and evaluated for N and P using data on nutrient cycles on species in the genus Eucalyptus in regrowth and mature native eastern Australian forests. It has been hypothesised that NUE increases with decreasing nutrient availability however increasing such efficiency has a cost reflected in reduced productivity. The hypothesis was proven for all expressions of NUE correlating NUE against estimates of soil N or P availability but there were differences between coastal and tableland Eucalyptus forests. The level of significance varied for different types of NUE and in these ecosystems P was of greater significance than N. This reflected the importance of P in relation to productivity on many of the weathered soils or the limited value of the soil available N indices. It is suggested that the difference expressions of NUE differ in their significance with species so some will be relatively more efficient in terms of uptake, others in utilisation and others in redistribution. Only in extreme situations of nutrient availability do species have relatively high efficiency for all methods NUE calculation. It is proposed that these differences are of importance in site/species distribution and more importantly in mixed stands where they provide advantages either at different stages of stand development or after significant disturbances such as fire.

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Foliar nutrient dynamics and nutrient use efficiency in Cornus florida

Oecologia ◽

10.1007/bf00379355 ◽

1985 ◽

Vol 66 (4) ◽

pp. 602-606 ◽

Cited By ~ 31

Author(s):

Jane A. Kost ◽

R. E. J. Boerner

Keyword(s):

Nutrient Dynamics ◽

Nutrient Use Efficiency ◽

Cornus Florida ◽

Nutrient Use ◽

Foliar Nutrient ◽

Use Efficiency

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Influence of Different Rates of Nitrogen (N) and Phosphorus (P) Fertilizers on Growth and nutrient use efficiency of Hevea brasiliensis

European Journal of Engineering Research and Science ◽

10.24018/ejers.2018.3.3.628 ◽

2018 ◽

Vol 3 (3) ◽

pp. 53

Author(s):

Nur Aqilah Saufe ◽

Zulkefly Sulaiman ◽

Salisu Monsuru Adekunle ◽

Mohd Yusoff A. Samad ◽

Martini Mohammad Yusoff

Keyword(s):

Nutrient Use Efficiency ◽

Dry Weight ◽

Nutrient Concentrations ◽

Fixed Rate ◽

Shoot Dry Weight ◽

Christmas Island ◽

Nutrient Use ◽

Vegetative Traits ◽

Use Efficiency ◽

Total Dry Weight

The effect of N and P on nutrient concentrations, growth and vegetative traits of rubber (RRIM 2025) clone was evaluated. The treatments consisted 9 combinations of nitrogen (Urea) and phosphorus (Christmas Island Rock Phosphate – CIRP) with fixed rate of potassium (1.5 g per plant). The treatments were applied at different rates T1 (39.49 g), T2 (42.10 g), T3 (38.18 g), T4 (27.28 g) and T5 (26.10 g). The seedlings were planted in 15 cm x 30 cm filled with an Oxisol soil. Soil containing treatment (T2) significantly increased the seedlings growth like height and girth size than the remaining treatments. The results found that seedlings grown with T2 recorded higher chlorophyll content than the seedlings that were grown with T1, T4 and T5. Noticeably seedlings that was grown with T1 (39.49 g), T2 (42.10 g), and T3 (38.18 g) significantly had a higher shoot dry weight (SDW) than seedlings that were grown with T4 (27.28 g) and T5 (26.10 g). The same scenario was noticed in total dry weight (TDW) of the seedlings where T1 (68.64 g), T2 (73.30 g) and T3 (67.08) significantly recorded higher total dry weight than seedlings that were grown with T4 (50.29 g) and T5 (48.86 g). The result shows reflected a correlation between the SDW and TDW with respect to similar influence of the treatments on both the vegetative traits. Higher nitrogen content was recorded in seedlings rubber that were grown with T2 (3.57%) and significantly different from the seedlings that were grown with other treatments. The results of this study showed that higher dosage of fertilizer may not be necessary for the rubber seedlings. Application of fertilizers at the rate T2 which contains 2.0 g urea/plant and 7.5 g CIRP/plant could be considered as the optimum amount of fertilizer required for the rubber seedlings.

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Tomato Production in Florida Using Fertigation Technology

EDIS ◽

10.32473/edis-hs1392-2020 ◽

2020 ◽

Vol 2020 (5) ◽

Author(s):

Mary Dixon ◽

Guodong Liu

Keyword(s):

Nutrient Use Efficiency ◽

Health Benefits ◽

Vegetable Crop ◽

High Demand ◽

Tomato Production ◽

Nutrient Use ◽

Use Efficiency

Tomato is in high demand because of its taste and health benefits. In Florida, tomato is the number one vegetable crop in terms of both acreage and value. Because of its high value and wide acreage, it is important for tomato production to be efficient in its water and nutrient use, which may be improved through fertigation practices. Therefore, the objective of this new 7-page article is to disseminate research-based methods of tomato production utilizing fertigation to enhance yield and nutrient use efficiency. Written by Mary Dixon and Guodong Liu, and published by the UF/IFAS Horticultural Sciences Department.https://edis.ifas.ufl.edu/hs1392

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Connecting Crop Nutrient Use Efficiency to Future Soil Productivity

10.24047/bc10248 ◽

2018 ◽

Vol 102 (4) ◽

pp. 8-10

Author(s):

Fernando García ◽

Andrés Grasso ◽

María González Sanjuan ◽

Adrián Correndo ◽

Fernando Salvagiotti

Keyword(s):

Nutrient Management ◽

Nutrient Use Efficiency ◽

Management Strategies ◽

Crop Productivity ◽

Soil Productivity ◽

Nutrient Use ◽

Grain Crop ◽

Wide Scale ◽

Use Efficiency

Trends over the past 25 years indicate that Argentina’s growth in its grain crop productivity has largely been supported by the depletion of the extensive fertility of its Pampean soils. Long-term research provides insight into sustainable nutrient management strategies ready for wide-scale adoption.

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