1、Optimizing nitrogen fertilizer application in Chinese rice production

Optimizing the nitrogen (N) fertilizer use is the key to facilitating the sustainable development of agricultural systems. In this study, a DeNitrification–DeComposition model was used to analyze the effects of N fertilization on yield, profit, and reactive N losses in single-season rice production of China.

2、Estimating thresholds of nitrogen, phosphorus and potassium fertilizer

In this study, we proposed a method that utilizes allowed ranges of partial nutrient balance and yield to estimate the threshold of nitrogen (N), phosphorus (P), and potassium (K) fertilizer applied to rice (Oryza sativa L.) fields in China.

3、Optimal nitrogen rate strategy for sustainable rice production

Herein, using a combination of bottom-up and top-down strategies, we evaluate these two optimal N application strategies for rice systems at the subregional scale to cover these knowledge...

4、Optimal Nitrogen Fertilizer Usage per Hectare for Rice

Results indicate that 55% of rice farmers overuse nitrogen fertilizer, and hence the region could save 18 kg of nitrogen per hectare without compromising rice yield.

Response of Crop Yield to Nitrogen Application and Optimal Nitrogen

Therefore, to achieve high yields while maintaining soil nitrogen pool stability, recommended nitrogen application rates are 300 kg ha−1 for the rice season and 257.1 kg ha−1 for the wheat season.

Data

Results indicate that 55% of rice farmers overuse nitrogen fertilizer, and hence the region could save 18 kg of nitrogen per hectare without compromising rice yield. Disincentivizing...

Nitrogen Fertilizer Application and Optimized Planting Density

Results showed that N application rate, planting density, and their interactions significantly influenced yield, PTI, grain number in middle/lower secondary branches, and total grain number in lower secondary branches of rice DP128. Parameters trends were consistent over two years.

Optimizing N fertilizer rates sustained rice yields, improved N use

In terms of rice yield sustainability, best practice N management aims to maximize the efficiency of N fertilizer use by matching the applied N rate with the crop N demand and by reducing N losses via optimal application strategies.

Optimizing rice yield, quality and nutrient use efficiency through

Reasonable nitrogen (N) and potassium (K) application rates can effectively improve fertilizer use efficiency, rice yield and quality.

Optimizing Nitrogen Application for Sustainable Rice Production in

The researchers found that meeting national rice production targets in 2030 in China is possible under optimal nitrogen rate strategy while concurrently reducing nationwide nitrogen consumption by 10-27%, mitigating reactive nitrogen losses by 7-24%, and increasing nitrogen use efficiency by 30-36%.

Rice is one of the world's most important food crops, and its cultivation heavily relies on nitrogen fertilizer. Proper application of nitrogen not only boosts yield and quality but also helps control pests and diseases, ensuring sustainable rice production. Below, we explore the appropriate nitrogen fertilizer dosage for one hectare of rice.

I. Role and Importance of Nitrogen Fertilizer

1. Promotes Growth: Nitrogen is one of the three essential nutrients for plant growth. It plays a critical role in rice development, enhancing root growth, disease resistance, and overall growth speed and quality.
2. Increases Yield: Nitrogen fertilization significantly improves rice yields, especially under nitrogen-deficient conditions.
3. Improves Quality: Nitrogen enhances rice quality, such as increasing protein content in grains, which improves taste and nutritional value.
4. Reduces Pests and Diseases: Appropriate nitrogen use can lower the incidence of diseases (e.g., leaf blast, rice blast) and pests (e.g., rice planthoppers, stem borers).
5. Environmentally Friendly: Rational nitrogen application minimizes environmental impacts, such as soil degradation and groundwater pollution.

II. Methods to Determine Optimal Nitrogen Usage

1. Soil Testing: Analyzing soil nitrogen content is the most direct approach. Soil tests help farmers tailor fertilization plans based on soil conditions.
2. Empirical Methods: Local experience, combined with climate and soil type, provides rough estimates. This method requires practical farming knowledge.
3. Recommended Dosage: For different regions and rice varieties, the optimal nitrogen rate varies. Generally, 75–100 kg of pure nitrogen per hectare is recommended. Adjustments should be made based on specific conditions.

III. Precautions and Recommendations

1. Avoid Overapplication: Excess nitrogen causes late maturation and reduced quality. Control dosage strictly.
2. Timely Application: Apply nitrogen during critical growth stages: tillering and jointing. These periods demand adequate nitrogen for healthy development.
3. Integrate with Other Fertilizers: Combine nitrogen with phosphorus, potassium, and organic fertilizers for balanced nutrition.
4. Protect the Environment: Prevent fertilizer runoff and water pollution by using efficient application methods.
5. Practice Crop Rotation: Rotating rice with other crops improves soil health, reduces pests, and enhances long-term productivity.

Rational nitrogen use is vital for maximizing rice yield and quality while minimizing environmental risks. By adopting scientific fertilization practices and adjusting dosages based on local conditions, farmers can achieve sustainable rice production without compromising soil or ecological health.