1、Nitrogen fertilization strategies to reduce the risk of nitrate

Spinach is a nitrogen (N) demanding crop with a weekly N uptake of up to 60 kg ha –1. Consequently, a high N supply is required, which can temporarily lead to high quantities of nitrate (NO 3–) being at risk of leaching.

2、Impact of nitrogen fertilizer type and application rate on growth

Thus, choosing the correct nitrogen fertilizer type and application rate is key for successful spinach cultivation. This study investigated the effects of different nitrogen (N) fertilizer type and application rates on the growth, nitrate content, and storage quality of spinach plants.

3、Alternative strategies for nitrogen fertilization of overwinter

The present study was aimed to identify the best practice for overwinter spinach N fertilization, defining the proper fertilizer dose, typology of application at the right time, at a local and regional scale.

Different nitrogen fertilizers and ratios effect on growth, safety and

Applying appropriate ratio of ammonium fertilizer into spinach cultivation can help reduce the accumulation of nitrate and nitrite into spinach, and also effectively regulate the metabolism of organic acids and amino acids.

What Happens When Nitrogen Fertilizer Exceeds the Amount for Water Spinach?

This study investigated the effects of different nitrogen (N) fertilizer type and application rates on the growth, nitrate content, and storage quality of spinach plants.

Spinach

Nitrate and oxalate contents of spinach were highly dependent on levels of irrigation and nitrogen fertilization. Nitrogen fertilization significantly decreased nitrogen use efficiency. Both water use efficiency and profit responded positively to increased nitrogen fertilizer usage.

(PDF) Effects of fertilizers on the growth, yield and nitrate content

It is clear that, there was no significant difference in plant height and number of leaves/plant when application of the biofertilizer with a half rate of nitrogen fertilizers by the two...

Effect of Excess Application of Nitrogenous Fertilizer on Postharvest

The present study investigated the effect of excess application of nitrogen fertilizer dose on the quality attributes of spinach leaves during storage. The results revealed that the fertilizer dose had a negative effect and storage temperature had a positive effect on the respiration rate.

Nitrogen Source and Dose Effects on Spinach Yield and Total Nitrogen

In this study, we investigated the effects of different N sources, doses (25, 50, 100, 200, and 400 mg N kg -1), and storage durations on dry weight and total N content of spinach plants. Four N sources, including ammonium sulfate (AS), calcium nitrate (CN), slow-release ammonium soil (SRAS).

Can you use high nitrogen fertilizer for growing spinach? Why?

Thus, choosing the correct nitrogen fertilizer type and application rate is key for successful spinach cultivation. This study investigated the effects of different nitrogen (N) fertilizer type and application rates on the growth, nitrate content, and storage quality of spinach plants.

Effects of Excessive Nitrogen Fertilizer on Spinach and Mitigation Measures

Nitrogen fertilizer is indispensable in agricultural production and plays a critical role in plant growth. improper use of nitrogen fertilizer can lead to problems. For spinach, a crop highly sensitive to nitrogen, excessive application may negatively impact its growth. Understanding how to address nitrogen overdose is essential.

I. Effects of Excessive Nitrogen Fertilizer on Spinach

1. Inhibited Growth: Excessive nitrogen accelerates spinach growth, leading to overly lush stems and leaves. This disrupts internal nutrient distribution, hindering normal development. Additionally, leaves may become thin, yellowish, or even wilt, severely compromising quality and yield.

2. Reduced Quality: Over-fertilization lowers nutritional value, decreasing protein and vitamin content in spinach. It also increases nitrate accumulation, posing health risks to consumers.

3. Increased Pest and Disease Susceptibility: Excess nitrogen weakens spinach’s disease resistance, making it vulnerable to fungal, bacterial, and pest attacks (e.g., aphids). This exacerbates pest and disease outbreaks.

II. Mitigation Measures for Excessive Nitrogen Fertilizer

1. Timely Top-Dressing with Moderate Nitrogen:

   • Reduce watering to dilute soil nutrients and minimize nitrogen leaching.
   • Apply balanced doses of urea or ammonium nitrate around roots, covering with soil to prevent volatilization.

2. Adjust Nitrogen Dosage and Timing:

   • Base fertilization on spinach growth stages and soil conditions. Increase nitrogen during early growth phases; reduce it later to avoid overstimulation. Avoid fertilizing during hot seasons to prevent nitrogen loss.

3. Enhance Field Management:

   • Optimize planting density, perform timely tillage, and maintain soil moisture. These practices improve photosynthesis, nitrogen uptake, and reduce weed competition.

4. Substitute Organic Fertilizers:

   • Replace partial synthetic fertilizers with organic options (e.g., farm manure, green manure). Organic matter improves soil structure, water retention, and fertility while balancing nutrient supply.

5. Biological Pest Control:

   • Use natural predators (e.g., ladybugs, hoverflies) to control aphids. Apply biopesticides like tea saponin or polysaccharides to inhibit pathogens. These eco-friendly methods reduce chemical reliance.

6. Soil Testing and Monitoring:

   • Regularly test soil for nitrogen, phosphorus, potassium, and pH levels. Tailor fertilization and management strategies based on results to ensure precision and sustainability.

Excessive nitrogen harms spinach by stunting growth, lowering quality, and increasing pest risks. Mitigation involves timely nitrogen supplementation, optimized fertilization schedules, improved field practices, organic amendments, biological controls, and soil monitoring. Implementing these measures promotes healthy spinach growth while minimizing nitrogen-related issues.