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Related Experiment Video

Updated: Feb 10, 2026

Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii
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[Nitrogen application technology in dwarfed apple trees.]

Qian Chen1, Ning Ding1, Ling Peng1

  • 1College of Horticulture Science and Enginee-ring, Shandong Agricultural University/State Key Laboratory of Crop Biology, Tai'an 271018, Shandong, China.

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|May 26, 2018
PubMed
Summary
This summary is machine-generated.

Intensive nitrogen fertilization significantly improves apple tree growth, nutrient uptake, and fruit quality. This method enhances nitrogen utilization and reduces losses compared to traditional single or double applications.

Keywords:
15 N-ureaabsorptiondwarfed applefruit qualitylossmethod of nitrogen applicationutilization

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Horticulture

Background:

  • Optimizing nitrogen fertilization is crucial for enhancing crop yield and quality.
  • Understanding nitrogen absorption, utilization, and loss dynamics is key to sustainable agriculture.
  • Apple tree (Malus hupehensis Rehd.) growth and fruit development are sensitive to nutrient availability.

Purpose of the Study:

  • To investigate the effects of different nitrogen fertilization strategies on 'Yanfu3'/M26/Malus hupehensis Rehd. seedlings.
  • To evaluate nitrogen-15 (15N)-urea absorption, utilization, and loss under varied fertilization regimes.
  • To determine the impact of fertilization on physiological traits and fruit quality.

Main Methods:

  • Utilized the 15N trace technique to track nitrogen dynamics in apple seedlings.
  • Implemented three distinct nitrogen fertilization treatments: single application (1), double application (2), and intensive multiple applications (3).
  • Measured leaf area, chlorophyll content, photosynthetic rate, biomass, enzyme activities, MDA content, 15N derived from fertilizer (Ndff) values, and fruit quality parameters.

Main Results:

  • Intensive fertilization (treatment 3) significantly increased leaf area, chlorophyll content, photosynthetic rate, total N content, and biomass compared to treatments 1 and 2.
  • Treatment 3 enhanced protective enzyme activities (SOD, POD, CAT) and reduced malondialdehyde (MDA) content, indicating reduced oxidative stress.
  • Treatment 3 showed the highest Ndff values in all organs, superior nitrogen utilization (33.6%), and lower nitrogen loss (46.9%), alongside improved fruit mass, soluble solids, and sugar-acid ratio.

Conclusions:

  • Intensive nitrogen fertilization significantly boosts the growth, physiological functions, and nitrogen use efficiency of apple seedlings.
  • This fertilization strategy enhances fruit quality attributes, including mass, soluble solids, and sugar-acid balance.
  • The findings support the adoption of intensive nitrogen application techniques for improved apple production and resource management.