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Optimizing Nitrogen Application for Jojoba under Intensive Cultivation.

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Summary

For intensively grown jojoba, 150 kg N ha-1 is recommended. Leaf analysis identifies nitrogen (N) deficiency, while soil sampling detects excess N, optimizing fertilization.

Keywords:
Simmondsia chinensisdiagnostic leaffertilizationplant nutritionproductivityvegetative growth

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Area of Science:

  • Agricultural Science
  • Plant Nutrition
  • Soil Science

Background:

  • Jojoba (Simmondsia chinensis) cultivation lacks comprehensive nitrogen (N) requirement data.
  • Intensive jojoba farming necessitates precise nutrient management for optimal yield and environmental protection.

Purpose of the Study:

  • To determine the optimal nitrogen (N) application rate for mature jojoba plants under intensive management.
  • To assess the impact of varying N levels on plant nutrition, growth, productivity, and soil nitrate accumulation.

Main Methods:

  • A 6-year field study applied five N rates (50–500 kg N ha-1) via subsurface drip irrigation.
  • Leaf and soil samples were analyzed throughout the growing season to monitor nutrient status and nitrate levels.
  • Plant growth and productivity were measured to correlate with N application rates.

Main Results:

  • Leaf N concentration directly correlated with applied N rates, with 1.3% N identified as the deficiency threshold.
  • Vegetative growth was stunted at 50 kg N ha-1; higher N rates increased leaf P levels.
  • Excessive nitrate accumulation occurred in soil at the two highest N application rates (370 and 500 kg N ha-1).

Conclusions:

  • An optimal N application rate of 150 kg N ha-1 is recommended for intensively grown jojoba, balancing productivity, cost, and environmental impact.
  • Leaf analysis provides a reliable method for diagnosing N deficiency in jojoba.
  • Soil sampling at the end of the season can effectively detect N over-application, preventing environmental contamination.