1、Appropriate nitrogen application rate with decreased basal/topdressing

An optimized model for simulating grain-filling of maize and regulating nitrogen application rates under different film mulching and nitrogen fertilizer regimes on the Loess Plateau, China

2、Nitrogen use efficiency—a key to enhance crop productivity under a

Studies have shown that crops use only 50% of the applied N effectively, while the rest is lost through various pathways to the surrounding environment. Furthermore, lost N negatively impacts the farmer’s return on investment and pollutes the water, soil, and air.

3、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.

4、Prediction Model of Nitrogen, Phosphorus, and Potassium Fertilizer

This study showed that the HA–NN prediction model was superior in predicting the NPK fertilizer application rate for greenhouse tomatoes under three different soil fertility conditions.

Optimizing nitrogen fertilizer for improved root growth, nitrogen

Compared to the N0 treatment (0 kg N ha −1), the application of N fertilizer at a rate of 300 kg N ha −1 resulted in consistent and higher seed cotton yields of 5875 kg ha −1 and 6815 kg ha...

Fertilizer application rate and nutrient use efficiency in Chinese

We reviewed 476 papers from 1990 to 2021 to investigate the changes in the conventional application rate (CAR) and nutrient use efficiency (NUE) of fertilizers. The results indicated a decrease in the CAR of nitrogen (N) and phosphorus (P) fertilizers from 1993 to 2020.

Optimal timing and rate of nitrogen fertilizer use: An integrated

We use this framework to estimate nitrogen fertilizer application inefficiency and to determine the optimal rate and timing of fertilizer application. We apply this framework to wheat production at the field scale, using an agronomic simulation model calibrated to experimental data from Australia.

Fertilizer Types and Calculating Application Rates

Calculate the rate of fertilizer to apply to obtain the proper N rate and also calculate the amount of Fe that is applied at the rate of application used to supply the needed nitrogen.

Fertilizer application rate and nutrient use efficiency in

We reviewed 476 papers from 1990 to 2021 to investigate the changes in the conventional application rate (CAR) and nutrient use efficiency (NUE) of fertilizers.

Optimizing nitrogen application rates to maximize productivity while

Optimizing the nitrogen (N) fertilization level and cropping system is critically important for achieving good production performance with low environmental pollution.

The suitable amount of nitrogen fertilizer to apply in a greenhouse depends on soil conditions, crop type, and growth stage. Here is a detailed step-by-step guide:

1. Assess Soil Conditions: Before fertilization, evaluate the nutrient status of greenhouse soil through soil testing. Key indicators include nitrogen content, organic matter level, and pH value. Soils with deficient fertility may require higher nitrogen applications.

2. Crop-Specific Requirements: Different plants have varying nitrogen needs. High-demand crops (e.g., vegetables, fruit trees) require more nitrogen compared to low-demand species (e.g., herbaceous plants, flowers). Adjust application rates accordingly, increasing for nitrogen-hungry crops and reducing for less demanding varieties.

3. Growth Stage Adaptation: Nitrogen requirements change throughout plant development. Apply higher rates during early growth stages when nutrient demand is strong, and reduce applications during later stages as needs decline.

4. Climate Considerations: Environmental factors impact nitrogen usage. In dry or hot conditions, increased transpiration raises plant nitrogen demands, warranting higher fertilizer applications.

5. Fertilizer Selection: Choose appropriate nitrogen sources like urea, ammonium nitrate, or potassium nitrate based on soil and crop needs. Always follow recommended dosages to avoid overapplication.

6. Application Methods: Combine nitrogen fertilizers with organic matter to enhance efficiency, or apply directly near root zones for quicker absorption. Proper placement improves nutrient uptake.

7. Monitoring & Adjustment: Regularly test soil nitrogen levels and observe crop responses. Refine future fertilization plans based on performance data and plant health indicators.

8. Prevent Over-Fertilization: Excessive nitrogen causes soil salinization, impairing aeration and water penetration. Adhere to calculated requirements and prioritize precise, balanced applications.

optimal nitrogen application involves comprehensive consideration of soil health, crop type, phenological stage, climate, fertilizer type, and application techniques. Through systematic planning and responsive adjustments, healthy greenhouse crop production can be effectively supported.