1、Effects of the Annual Nitrogen Fertilization Rate on Vine Performance

The current meta-analysis produced annual rates of nitrogen fertilization for vines that can be considered general for maximizing nitrogen use efficiency depending on production objectives, either yield or quality-oriented.

2、(PDF) Effects of the Annual Nitrogen Fertilization Rate on Vine

In general, the nitrogen requirements for 95% of the maximum grape yield amounted to rates between 30 and 40 kg·N·ha −1 , which increased nitrogen use efciency (NUE) to values between 0.27...

3、Optimizing drip fertigation management to simultaneously improve the

Drip fertigation increased grape yield, WUE and FAUE. The optimal drip fertigation strategy for highest yield, WUE and FAUE was derived in wet and dry years. Response surface methodology was used to determine optimal irrigation and fertilization in wet and dry years.

4、Best Management Practices for Nitrogen Fertilization of Grapevines

It is important, therefore, when using nitrogen (N) fertilizer to apply best management practices that optimize N use efficiency. Nitrogen should be applied when vine uptake is rapid, and N rates should not exceed vine requirements.

Nutrient Diagnosis and Precise Fertilization Model Construction

Therefore, this work evaluated plant and rhizosphere soil nutrition to determine optimal nutrient ranges of plant and soil elements for high-quality grape production by CND and to develop a precise fertilization model combining the fertilizer requirements of the species and nutrient interactions.

CDFA

Effect of nitrogen fertilizer timing and rate on inorganic nitrogen status, fruit composition, and yield of grapevines. American Journal of Enology and Viticulture, 45, 377-387.

Effects of the Fractionation of the Nitrogen Fertilization on Root

Results showed that under our climate conditions nitrate was taken up by the grapevines when applied both in spring or in spring and post-harvest.

The optimal time for grape nitrogen fertilizer application is during

In general, the nitrogen requirements for 95% of the maximum grape yield amounted to rates between 30 and 40 kg·N·ha −1, which increased nitrogen use efficiency (NUE) to values between 0.27 and 0.36 t·kg·N −1.

Nitrogen fertilisation.indd

With a few exceptions, nitrogen is only found in moderate to low quantities in the soils of Australian vineyards. However nitrogen fertiliser should be applied to vines carefully as excessive availability of nitrogen increases shoot growth at the cost of fruit development.

Reduced nitrogen fertilization from pre

To regulate vine growth and improve grape and wine quality, Cabernet Gernischt (Vitis vinifera L.) grapevines were subjected to lower levels of N, compared to normal N supply treatments, during the grape growing seasons of 2019 and 2020 in the wine region of Yantai, China.

Nitrogen fertilizer is a critical nutrient for plant growth, playing a vital role in the development and productivity of grapevines. Proper nitrogen application promotes growth, yield, and fruit quality. excessive use can lead to issues such as excessive vegetative growth and reduced fruit quality. Thus, rational nitrogen management is a key consideration in grape production.

I. Nitrogen Requirements of Grapevines

The demand for nitrogen varies based on grape varieties, soil types, and climatic conditions. Generally, grapevines require significant nitrogen due to its role in synthesizing proteins, nucleic acids, chlorophyll, and other organic compounds. Nitrogen demands are highest during early growth stages, where adequate supply supports root and leaf development. As vines mature, nitrogen requirements decrease, though consistent application remains essential for sustained health.

II. Methods of Nitrogen Application

1. Base Fertilization Base fertilizers, applied during early growth, include organic materials (e.g., animal manure, green manure) and chemical fertilizers (e.g., urea, ammonium phosphate). Organic fertilizers improve soil structure and nutrient availability, while chemicals provide direct nitrogen uptake. Early-stage vines may require increased nitrogen to meet peak demands.

2. Topdressing Supplementary fertilization during growth involves nitrogen, phosphorus, and potassium. Nitrogen promotes leaf expansion and fruiting, phosphorus supports root development and fruit quality, and potassium regulates water balance and stress resistance. Typical applications include 5–10 kg/mu of urea, 10–20 kg/mu of superphosphate, and 5–10 kg/mu of potassium chloride, adjusted based on vine health and soil fertility.

III. Best Practices for Nitrogen Application

1. Balanced Fertilization Pair nitrogen with phosphorus and potassium to enhance efficiency and fruit quality.

2. Dose Adjustment Tailor nitrogen rates to growth stages and soil conditions. Increase during early growth, then reduce to avoid excessive vegetative growth and poor fruit quality.

3. Avoid Overapplication Excess nitrogen leads to weak fruit quality and lanky growth. Monitor vines and fruits to determine if supplementation is needed.

4. Timely Topdressing Apply nitrogen around flowering to improve fruit set and quality.

IV. Key Considerations

1. Soil pH: Grape varieties have varying pH preferences; adjust fertilizers accordingly.
2. Soil Texture: Choose fertilizers suited to local soil absorption capacities.
3. Climate: Nitrogen needs change with weather; adapt practices to regional conditions.

scientific nitrogen management is critical for grapevine health and productivity. By aligning application methods, dosages, and timing with growth stages and environmental factors, producers can achieve optimal yields and fruit quality.