1、Optimal Fertilizer Application Rates for Fertigation System

Based on our observations, we suggest the recommended fertilizer application rates for watermelon in nutrient-rich soils under a fertigation system are 47.8 (N)-15.4 (P 2 O 5)-88.1 (K 2 O) kg ha -1 at spring and 77.3-15.6-115.8 at summer.

2、Recommended fertilization rates based on watermelon yield and

We studied the nutrient requirements of watermelon for different yield levels in different watermelon production areas in China to propose the key technical measures for reducing fertilizer application rate and increasing fertilizer use efficiency.

3、UF/IFAS Nutrient Management Recommendation Series: Watermelon

Fertilizers should be applied in split applications to reduce leaching losses and lessen the danger of fertilizer burn. Broadcast all P 2 O 5, all micronutrients, if any, and 25%–30% of the N and K 2 O in the bed at planting.

4、Optimal water and fertilizer amount for balancing greenhouse melon

Optimal water and fertilizer dosages of melon were obtained using TOPSIS-GRA coupling model. With the best comprehensive benefit, 15 positive indicators were all above 85% of their single maximum value.

Optimal Application Frequency for Water

During this stage, regular applications of fertilizer for Watermelon can help support healthy foliage growth, strong root development, and increased fruit production.

Optimal Fertilizer Application Rates for Fertigation System to Grow

Based on our observations, we suggest the recommended fertilizer application rates for watermelon in nutrient-rich soils under a fertigation system are 47.8 (N)-15.4 (P2O5)-88.1 (K2O) kg ha-1 at spring and 77.3-15.6-115.8 at summer.

Watermelon Fertilizer Schedule PDF & Nutritioanl

To achieve precise nutrient delivery, Haifa recommends Nutrigation™ (fertigation), which provides nutrients directly through irrigation, ensuring targeted feeding at the root zone. Haifa’s Nutrigation™ programs supply the exact nutrient quantities required for optimal watermelon growth.

Watermelon Fertilizer Management: Application Schedule and Methods

During this stage, regular applications of fertilizer for Watermelon can help support healthy foliage growth, strong root development, and increased fruit production.

UF/IFAS Nutrient Management Recommendation Series: Watermelon1

Fertilizer Timing • Transplants may benefit from the application of a dilute, soluble starter fertilizer, especially with cool soil tem-peratures. Starter solution rates of N and P2O need not 5 exceed 10–15 lb/acre each.

How to Fertilize Watermelons: Enhance Your Harvest with Expert

An optimal range for nitrogen in watermelon cultivation is typically between 80 to 120 kg/ha, depending on the soil’s initial nutrient status. Phosphorus (P) facilitates robust root development and is vital for the early growth stage and flowering period.

Watermelon (scientific name: Citrullus lanatus) is a widely cultivated summer fruit, beloved for its juicy and refreshing taste. In agricultural production, nitrogen fertilizer is one of the essential nutrients for promoting plant growth, enhancing fruit yield, and improving quality. The optimal timing and dosage of nitrogen fertilizer application for watermelon depend on soil conditions, climate, and the plant’s growth stage. Below is a detailed exploration of the best practices for nitrogen fertilizer application in watermelon cultivation.

I. Watermelon’s Demand for Nitrogen Fertilizer

Nitrogen is a critical nutrient for plant development, playing a vital role in growth. For watermelon, appropriate nitrogen levels promote stem and leaf growth, increase leaf quantity, and enhance photosynthetic efficiency, providing ample resources for fruit expansion and sugar accumulation. excessive nitrogen can lead to excessive vegetative growth, reduced fruit quality, lower yields, and increased susceptibility to diseases. Thus, precise control of nitrogen fertilizer usage is key to healthy watermelon growth.

II. Optimal Timing for Nitrogen Application

1. Base Fertilization: Prior to planting, applying nitrogen as a base fertilizer is crucial. Use slow-release or long-term nitrogen products (e.g., 5–10 kg of urea or 20–30 kg of ammonium nitrate per mu) to ensure sustained nutrient supply throughout the growing season.

2. Topdressing: During the growth phase, apply nitrogen topdressing twice based on plant health and soil fertility:

   • First Topdressing: Around the flowering stage, apply 10–20 kg of high-nitrogen compound fertilizer per mu.
   • Second Topdressing: During fruit expansion, use 5–10 kg of low-nitrogen compound fertilizer per mu.

3. Foliar Spraying: Supplement nitrogen via foliar sprays with moderate-nitrogen formulations. Avoid spraying during hot weather to prevent leaf scorch.

III. Best Practices for Nitrogen Application

1. Deep Placement: Incorporate nitrogen into the soil by deep tillage to reduce volatilization and improve root absorption.

2. Mixed Application: Combine nitrogen fertilizers with organic matter (e.g., chicken or cow manure) to enhance efficiency. Microbes in organic fertilizers improve soil structure and root health.

3. Controlled-Release Technology: Use coated or controlled-release nitrogen fertilizers to minimize losses and avoid overdosing.

IV. Key Considerations

1. Soil Testing: Conduct soil analysis before application to determine nitrogen content and adjust dosage accordingly.

2. Balanced Fertilization: Pair nitrogen with phosphorus, potassium, and other micronutrients to ensure comprehensive nutrition.

3. Disease Management: Excessive nitrogen weakens disease resistance. Coordinate fertilization with pest and disease control measures.

The optimal frequency and method of nitrogen application for watermelon depend on soil, climate, and growth stages. A scientific fertilization strategy, combined with proper management, maximizes yields and fruit quality while promoting healthy plant development.