1、Global meta

Modelled RE N was higher for rice (42 %, 95 % CIs 39–45 %) and wheat (42 %, 95 % CIs 40–45 %) than for maize (36 %, 95 % CIs 34–39 %). Fertilizer type and frequency were important factors influencing RE N with generally low values for organic fertilizer and single applications.

2、Improving Nitrogen Use Efficiency in Rice for Sustainable Agriculture

For sustainable agriculture, improving the nitrogen use efficiency (NUE) to decrease N fertilizer input is imperative. In the present review, we firstly demonstrate the role of N in mediating root architecture, photosynthesis, metabolic balance, and yield components in rice.

3、Data

Increasing nitrogen use efficiency (NUE) in agricultural production mitigates climate change, limits water pollution and reduces fertilizer subsidy costs. Nevertheless, strategies for...

4、Improving Nitrogen Use Efficiency—A Key for Sustainable Rice Production

In this mini-review, we show how SSNM can foster sustainability in rice production systems through improved rice yields, profit, and N use efficiency while reducing N losses. Farmer adoption of SSNM, however, remains low.

5、(PDF) Nitrogen Use Efficiency in Rice

Nitrogen use efficiency (NUE) was calculated as described in Huang et al., (2018). Data analysis was done using open software R language with agricolae package (Mendiburu and Yaseen 2021). ...

Techniques for Improving Nitrogen Use Efficiency in Rice

Increasing NUE reduces nitrogen fertilizer consumption, prevents N fertilizer loss and rice productivity. In the present study, fertilizer types, water irrigation management, and rice cultivars are the factors for improving nitrogen use efficiency in rice.

Toward improving nitrogen use efficiency in rice: Utilization

In this review, we expand the scope of NUE improvement, not only the N utilization by plants, but also the N coordination with other resources as well as the N availability in the soil, which represent the major dimensions in manipulating NUE.

Endophytes Enhance Rice Inorganic Nitrogen Use Efficiency and Mitigate

Rice cultivation involves the large amounts of fertilizers application, but nitrogen (N) use efficiency remains low. Endophytes are considered key microorganisms that regulate nitrogen utilization and gaseous nitrogen loss in rice paddy ecosystems.

Effect of long

Based on deep placement of chemical fertilizers, that reduction of nitrogen fertilizer rate with 16%–30% for continuous seven years enhanced partial factor productivity of applied nitrogen, and increased the yields of early and late rice by 4.37%–32.70%, and maintained the stability of soil organic matter and total N, P and K contents.

Improving nitrogen use efficiency of rice crop through an optimized

Many studies have focused on the evaluation system and influencing factors of NUE, as well as the mechanism of efficient N utilization. NUE includes N absorption and utilization.

There are numerous reasons for the low nitrogen fertilizer use efficiency (NUE) in rice production. The following are the main contributing factors:

1. Soil Conditions: Soil texture, structure, and nutrient content directly affect rice’s ability to absorb and utilize nitrogen. Soils with low organic matter content are prone to nitrogen leaching, leaving rice plants unable to effectively absorb it. Additionally, imbalances in other nutrients like phosphorus and potassium can hinder nitrogen uptake. Environmental factors such as soil pH and temperature also significantly influence nitrogen absorption.

2. Inappropriate Rice Variety Selection: Different rice varieties have varying nitrogen requirements and utilization efficiencies. Some varieties demand high nitrogen but have limited absorption capacity, leading to excess nitrogen accumulation in the soil. Others exhibit inherently low nitrogen use efficiency. Selecting varieties tailored to specific nitrogen needs and efficiency is critical for optimizing fertilizer use.

3. Improper Fertilization Practices: Factors such as fertilizer dosage, timing, and application method greatly impact nitrogen distribution in the soil. Over-fertilization causes nitrogen buildup, reducing its effectiveness, while insufficient application leads to nitrogen deficiencies, stunting growth and yield. Scientifically balanced fertilization strategies aligned with soil conditions and crop demands are essential.

4. Pest and Disease Issues: Pests and diseases disrupt rice growth and physiological processes, impairing nitrogen uptake. For example, certain pests secrete acidic substances, accelerating soil acidification and lowering nitrogen availability. Others damage root systems, reducing absorption capacity. Effective pest and disease management is crucial to minimize negative impacts on nitrogen availability.

5. Poor Water Management: Water is vital for rice growth. Proper irrigation ensures adequate nitrogen uptake, but excessive irrigation reduces soil oxygen, impairing root respiration, while water scarcity slows growth and nitrogen absorption. Irrigation schedules should be adjusted based on soil moisture and weather conditions.

6. Excessive Planting Density: High planting density restricts airflow, creating poor田间 ventilation and exacerbating competition for nutrients among plants. This diminishes nitrogen use efficiency. Optimal plant spacing is necessary to ensure sufficient nitrogen uptake.

7. Fertilizer Quality Problems: Low-quality fertilizers with unstable nutrient content or contaminants (e.g., heavy metals, pesticide residues) disrupt nutrient balance and harm soil health, further inhibiting nitrogen absorption. Using reliable, high-quality fertilizers is essential.

8. Climate Effects: Environmental conditions like temperature and precipitation influence nitrogen uptake. High temperatures reduce photosynthetic efficiency, weakening nitrogen absorption, while drought stress limits root development and nutrient uptake. Adaptive farming practices responsive to climate fluctuations are required.

Low nitrogen fertilizer use efficiency in rice stems from a combination of factors, including soil properties, variety selection, fertilization methods, pests, water management, planting density, fertilizer quality, and climate. To enhance NUE, integrated, science-based approaches addressing these factors are necessary to achieve efficient utilization of nitrogen resources.