Best Fertilizers For Napier Grass In Kenya

In this article, we will explore the best fertilizers for Napier grass in Kenya. Napier grass (Pennisetum purpureum) is a highly valued forage crop among dairy and livestock farmers in Kenya.  This is due to its exceptional nutritional content and ability to thrive in various climatic conditions. As a key feed source for livestock, the productivity and quality of Napier grass directly impact the livelihoods of many farmers and the country’s agricultural economy. To ensure optimal growth and yield, selecting the right fertilizer is of paramount importance.

Napier Grass Nutritional Requirements

As a tropical grass, it demands a blend of essential nutrients, including nitrogen (N), phosphorus (P), potassium (K), and other micronutrients. These nutrients play vital roles in various plant processes, such as photosynthesis, root development, and overall plant growth.

Best Fertilizers for Napier Grass in Kenya

1.      Organic Manure

Organic manure remains one of the best options for nurturing Napier grass in Kenya. It not only supplies essential nutrients but also improves soil structure, water retention, and microbial activity. Common organic manures include farmyard manure, compost, and vermicompost. Apply 5-10 tons per acre of well-rotted organic manure before planting or during the initial growth stages.

2.      Nitrogen-based Fertilizers

Napier grass is a heavy nitrogen feeder, and its continuous cutting for forage reduces the natural nitrogen recycling in the soil. Therefore, nitrogen-based fertilizers play a crucial role in supplementing the plant’s nitrogen needs. Urea is one of the most commonly used nitrogen sources in Kenyan agriculture. Applying urea at the rate of 50-100 kg per hectare in split doses, every 4-6 weeks, is advisable for optimal growth.

A common balanced NPK ratio used for general growth and development is 10-20-10 or 17-17-17. These ratios indicate the percentage of each nutrient in the fertilizer, listed in the order of nitrogen (N), phosphorus (P), and potassium (K).

  • 10-20-10: This ratio is suitable for the establishment phase of Napier grass, as it provides a higher concentration of phosphorus, which supports root development and initial growth.
  • 17-17-17: This balanced ratio is suitable for the maintenance phase and is often used when the grass is well-established and actively growing.

3.      Phosphorus-based Fertilizers

Phosphorus is vital for root development and overall plant health. Incorporating phosphorus-based fertilizers is especially important during the establishment phase of Napier grass. Single superphosphate or diammonium phosphate (DAP) can be applied at the rate of 50-75 kg per hectare during planting or early growth stages. in Kenya, the best DAP (Diammonium Phosphate) fertilizer ratio is typically recommended to be 18:46:0.

  1. Nitrogen (N) – 18%: Nitrogen is essential for promoting the growth of lush green leaves and stems in Napier grass. It helps in the formation of proteins and enzymes, which are vital for overall plant growth and health.
  2. Phosphorus (P) – 46%: Phosphorus is crucial for root development, flowering, and seed formation in plants. For Napier grass, which is primarily grown as fodder for livestock, a significant amount of phosphorus is necessary to support strong root systems and robust growth.
  3. Potassium (K) – 0%: The DAP fertilizer contains no potassium (0%), as it is specifically designed to provide a high concentration of phosphorus and nitrogen, which are the key nutrients needed for early growth and establishment in plants like Napier grass.

4.      Potassium-based Fertilizers

Even though Potassium is not majorly required when cultivating Napier grass, it aids in enhancing the grass’s tolerance to various stresses, including drought and diseases. Muriate of potash (potassium chloride) or Sulphate of potash (potassium sulfate) can be applied at the rate of 50-100 kg per hectare during the establishment phase and at regular intervals thereafter.

5.      Lime

Soil acidity can limit nutrient availability and negatively impact plant growth. Applying agricultural lime, which is usually calcium carbonate, at recommended rates can help neutralize soil acidity and improve nutrient uptake by the grass.

6.      Urea

Yes, urea is beneficial for Napier grass when used appropriately. Urea is a nitrogen-based fertilizer, and Napier grass is known to be a heavy nitrogen feeder. Nitrogen is crucial for promoting leafy growth and overall vigor in the grass. When applied in the right dosage and timing, urea can significantly enhance the productivity of Napier grass. However, it is essential to use urea in combination with other nutrients such as phosphorus and potassium to maintain a balanced nutrient profile for optimal growth and to prevent potential nutrient imbalances.

Napier grass Maintenance

To maintain Napier grass effectively, several key practices need to be followed. Regular cutting or harvesting is essential to encourage new and tender growth, which is more nutritious for livestock. The grass should be cut at a height of around 50-75 cm to maintain its quality and encourage tillering. Adequate irrigation is crucial, especially during dry periods, to ensure continuous growth and prevent the grass from becoming dry and unpalatable. Additionally, controlling weeds, proper fertilization, and conducting soil tests to monitor nutrient levels are essential parts of Napier grass maintenance.

Napier grass fast growth Hacks

To promote faster growth of Napier grass, certain steps can be taken.

  • Ensure the grass receives enough sunlight, as it is a crucial factor for its growth and photosynthesis.
  • Provide regular and balanced fertilization, including nitrogen, phosphorus, and potassium, to support healthy and rapid growth. Applying organic manure will also help improve soil fertility and contribute to faster growth.
  • Maintain proper irrigation and moisture levels in the soil as Napier grass thrives in well-watered conditions.
  • Practice good agronomic management, such as regular cutting and weeding. This can help maintain the grass at its optimum growth phase and encourage faster regrowth.

Final Word

Napier grass is a valuable forage crop in Kenya, and its productivity relies on appropriate fertilization practices. Combining organic manure and inorganic fertilizers in a balanced approach can significantly improve Napier grass growth and yield. By investing in the right fertilization strategies, Kenyan farmers can ensure sustainable Napier grass production, benefiting both their livestock and agricultural businesses.

Bob Kipkoech

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