1、Scheduling of nitrogen fertilizer topdressing during panicle

Topdressing at panicle differentiation (PF) according to soil fertility and regularity of rice nutrient absorption is an important agronomic practice used in cultivation of rice cultivars...

2、Recommendations for nitrogen fertiliser topdressing rates in rice using

Since rice is a major crop, research for field-specific N management systems that are based on an in-season assessment of the N requirements of rice is both necessary and challenging.

3、Optimizing Rice Yield and Heat Stress Resilience Through Nitrogen Top

The increased frequency of extreme heat stress events due to climate change is adversely impacting rice yield. Nitrogen (N) is an essential element in the synthesis of chlorophyll in rice, contributing substantially to the achievement of spikelet fertility and addressing the high yields.

4、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.

5、Optimizing rice in

Rice is a main food crop that occupies over one-fourth of global food production, the precision management of in-season rice N topdressing is vital for increasing rice yield and N use efficiency and reducing the environmental footprints of N fertilization.

Nitrogen fertilization application strategies improve yield of the rice

The results showed that N fertilization strategies could improve the nitrogen use efficiency and yield of rice, but the response of different rice varieties to N fertilizer strategies...

Effect of Nitrogen Fertilizer Topdressing for Panicle

The application of nitrogen fertilizer topdressing notably decreased the amylose content of rice. Both Gmax and Gmean of Jinyou 1319 exhibited a trend of N2>CK>N1>N3 under different nitrogen fertilizer topdressing levels, while those of Rongyou 702 followed a tendency of N3>N2>CK>N1.

Effects of Postponing Topdressing

Our results suggested that the proportion of panicle N applied to japonica rice should not exceed 30% in clayey paddy fields and that fertilizer management with respect to rice production should be adjusted according to soil type, soil fertility, and variety.

Improving nitrogen use efficiency of rice crop through an optimized

We hypothesized that NUE could be improved by optimizing the root system.

Scheduling of nitrogen fertilizer topdressing during panicle

Topdressing at panicle differentiation (PF) according to soil fertility and regularity of rice nutrient absorption is an important agronomic practice used in cultivation of rice cultivars with a long growth duration.

In agricultural planting, the healthy growth of rice seedlings relies on rational fertilization. Nitrogen and potassium fertilizers, as two primary nutrients, play crucial roles in seedling development. Below is a detailed analysis of the effects of nitrogen and potassium fertilizers on rice seedlings, along with guidance on selecting the appropriate fertilizer type based on specific conditions.

I. The Role and Selection of Nitrogen Fertilizer

1. Importance of Nitrogen Fertilizer

Nitrogen is a key element for plant growth and development. It is essential for chlorophyll synthesis, photosynthesis, and energy production. Nitrogen fertilizers promote stem elongation, increase leaf quantity, and boost crop yields.

2. Types of Nitrogen Fertilizers

• Urea: A common, cost-effective option with fast-acting properties but prone to volatilization, requiring timely application.
• Ammonium Bicarbonate: Slow-release fertilizer suitable for topdressing or basal application, providing sustained nitrogen supply.
• Ammonium Nitrate: Rapid-acting, ideal for topdressing, but caution is needed to prevent nitrogen loss.

3. Fertilization Recommendations

• Choose nitrogen fertilizers based on seedling growth stages and soil conditions. For early stages (e.g., jointing), use fast-acting urea or ammonium bicarbonate; for later stages, opt for longer-lasting ammonium nitrate.
• Avoid excessive nitrogen application to prevent excessive vegetative growth, which may reduce panicle number and grain weight.

II. The Role and Selection of Potassium Fertilizer

1. Importance of Potassium Fertilizer

Potassium enhances disease resistance, root development, fruit quality, and storage stability. For rice seedlings, it promotes root vigor and stress resistance.

2. Types of Potassium Fertilizers

• Potassium Sulfate: Suitable for diverse crops, stable, and non-volatile.
• Potassium Chloride: Best for acidic soils, as it raises soil pH and improves potassium absorption.
• Wood Ash: A natural potassium source rich in potassium but requires careful dosing to avoid seedling damage.

3. Fertilization Recommendations

• Select potassium fertilizers based on seedling growth and soil types. Apply potassium-rich sulfate in early stages and natural sources like wood ash in later stages.
• Balance nitrogen and potassium applications to ensure overall healthy growth.

III. Comprehensive Fertilization Strategies

To ensure healthy seedling growth, formulate fertilization plans based on soil tests and crop needs. Typically, base fertilizer accounts for 60%-70% of total input, while topdressing makes up 30%-40%. Maintain balanced ratios of nitrogen and potassium to meet nutritional demands at different growth stages.

Additional Tips:

• Avoid fertilizing during hot weather to prevent volatilization and foliage burn.
• Irrigate promptly after fertilization to aid nutrient absorption.
• Tailor fertilizer types and methods to crop varieties and soil properties.

Flexibly adjust nitrogen and potassium applications based on seedling stages and soil conditions. Scientific fertilization promotes robust growth, higher yields, and improved crop quality.