nitrogen · Molecular: metabolites · Spinacia oleracea (spinach)

The Role of Different Nitrogen Sources Combined with Foliar Applications of Molybdenum, Selenium or Sucrose in Improving Growth and Quality of )Edible Parts of Spinach (Spinacia oleracea L. · 1970

• positive
  Urea with foliar 10% sucrose decreased NO3- and soluble oxalate contents of spinach against the corresponding control.

  compared with corresponding control

Enhanced Employment of the Xanthophyll Cycle and Thermal Energy Dissipation in Spinach Exposed to High Light and N Stress · 1997

• positive
  Low nitrogen increased zeaxanthin and antheraxanthin fraction and the xanthophyll to chlorophyll ratio.

  compared with high-N

Effect of different concentrations of urea with or without nickel addition on spinach (Spinacia oleraceaE.) growth under hydroponic culture · 1999

• positive
  Increasing urea level significantly decreased shoot NO3-N content of spinach.

Growth Conditions To Reduce Oxalic Acid Content of Spinach · 2003

• positive
  Cutting off nitrate supply while keeping spinach plants cool and oxygenated reduced leaf oxalate content by 2/3 in one week.

Effects of Nitrogen Levels and Nitrate/Ammonium Ratios on Oxalate Concentrations of Different Forms in Edible Parts of Spinach · 2005

• positive
  Total and insoluble oxalate fell as N rose from 12 to 20 mM.
• positive
  Insoluble petiole oxalate decreased as nitrate/ammonium ratio decreased.
• positive
  Increasing ammonium proportion reduced total and soluble petiole oxalate, lowest at 50:50 nitrate/ammonium.
• negative
  Leaf and shoot total and soluble oxalate increased as N rose from 4 to 12 mM.

cites 1 paper herecited by 3 papers here

Effects of nitrogen forms on nitrate and oxalate accumulation in edible parts of spinach · 2006

• positive
  Increased ammonium sharply lowered soluble, insoluble and total oxalate accumulation in leaves, petioles and shoots.
• positive
  Increased ammonium sharply lowered soluble, insoluble and total oxalate content in leaves, petioles and shoots.

A Preliminary Study on Why It Is Difficult to Reduce Nitrate Spinach Petiole · 2006

• positive
  Adding leaf blade nitrate reductase increased petiole tissue nitrite formation rate in all three spinach cultivars.

The effect of nitrogen form and air temperature during foliar fertilization on gas exchange, the yield and nutritive value of spinach ( Spinacia oleracea L.) · 2008

• positive
  Nitrogen application at 15°C gave the lowest nitrate content.

Oxalate synthesis in leaves is associated with root uptake of nitrate and its assimilation in spinach (Spinacia oleracea L.) plants · 2014

• positive
  NR or GS inhibitors reduced leaf oxalate contents in spinach.
• negative
  Increasing nitrate levels enhanced oxalate synthesis in spinach.

cites 1 paper here

Nitrate Accumulation and Oxalate Formation in Spinach Plants (Spinacia oleracea, L.) as Affected by Nitrogen Fertilization levels and Iron Foliar Application. · 2017

• positive
  Foliar iron with nitrogen favorably affected oxalate formation relative to nitrogen alone.

  compared with plants treated with the same levels of nitrogen in single form

Effects of Bentonite Application and Urea Fertilization Time on Growth, Development and Nitrate Accumulation in Spinach (Spinacia oleraceaeL.) · 2018

• positive
  Urea fertilization 25 days after planting without bentonite gave the lowest oxalic acid content.

The Role of Different Nitrogen Sources Combined with Foliar Applications of Molybdenum, Selenium or Sucrose in Improving Growth and Quality of Edible Parts of Spinach (Spinacia oleracea L.) · 2019

• positive
  Urea plus ten percent sucrose was the most efficient combination for decreasing nitrate and soluble oxalate without losses of growth, vitamin C or minerals.

  compared with corresponding control

• positive
  Urea lowered soluble, insoluble and total oxalate content.
• positive
  Urea lowered spinach nitrate content.

cites 1 paper here

Nitrogen-molybdenum-manganese co-fertilization reduces nitrate accumulation and enhances spinach (Spinacia oleracea L.) yield and its quality · 2021

• positive
  Urea nitrogen yielded the lowest nitrate accumulation.

  compared with ammonium nitrate –N fertilizers

• negative
  The high nitrogen rate increased nitrate accumulation.

Effect of Nitrogenous, Organic and Biological Fertilizers on some Vegetative and Qualitative Characteristics of Spinach Plant Spinacea oleracea L. · 2023

• positive
  The same urea treatment decreased spinach nitrate content to 110.0 mg g-1.
• positive
  The same urea treatment decreased spinach oxalate content to 81.20 mg g.100 ml.