Microgreens, the seedlings of vegetables and herbs, have garnered recognition in the food and nutrition world due to their high nutrient content and diverse colors, textures, and flavors. While their cultivation can be straightforward, selecting a proper fertilizer can make all the difference in achieving the best possible growth and quality of these tiny but mighty greens. Hence, it is crucial to understand and choose fertilizers safe for microgreens to maximize their benefits into your food.
Choosing the Right Fertilizer: The N-P-K Ratio
A basic knowledge of plant nutrition can help when it comes to choosing the right microgreen fertilizer. The primary nutrients required by plants are nitrogen (N), phosphorus (P), and potassium (K), together known as the N-P-K ratio on fertilizer labels.
Nitrogen is essential for leafy growth, which is significant for microgreens since their cultivation involves harvesting young, green leaves. A decent nitrogen ratio supports lush, vibrant microgreen growth.
Phosphorous plays a critical role in energy transfer and root development. However, since microgreens are harvested before maturity, their root development needs are minimal; hence, a high phosphorous ratio is not as important.
Potassium aids in whole-plant function, including regulating water and nutrient movement in plants. Adequate potassium levels assure the overall health and vitality of microgreens.
Therefore, for microgreen cultivation, fertilizers with a higher nitrogen content relative to phosphorus and potassium are desirable, such as a ratio of 2-1-2.
Synthetic vs. Organic Fertilizers
Many synthetic (inorganic) fertilizers are formulated to provide a ready source of nutrients, which can boost rapid growth. However, synthetic options may not be safe for microgreens in the long run due to residual chemicals that may make their way into your plates. Microgreens are relatively fast-growing and have lighter feeding requirements, reducing the need for concentrates found in synthetic fertilizers.
On the other hand, organic fertilizers, derived from living organisms’ remains or by-products, are generally safer for microgreens and the environment. They release nutrients slowly, aiding in a steady, sustained growth. They also improve soil structure by promoting microbial life and not causing any harm to the greens, the consumers, or the earth.
Noteworthy Fertilizers for Microgreens
Several organic fertilizers available in the market are suitable for microgreens.
-
Worm Castings: Worm castings are essentially earthworm waste– a nutrient-rich organic fertilizer and soil conditioner. They provide an ample nitrogen supply, boosting microgreen growth without any risk of burning the young plants. Worm castings also contain beneficial microbes enhancing soil health.
-
Fish Emulsion: Fish emulsion is an organic fertilizer made from whole fish or parts of fish. It provides a balanced ratio of nitrogen, phosphorus, and potassium, with nitrogen often in abundance, making it suitable for microgreens. It is water-soluble and easily absorbable.
-
Seaweed Extract: Seaweed extract or kelp meal is rich in minerals and growth hormones. It supports microgreen growth and vitality while enhancing resistance to stressors, such as pests or diseases.
-
Composted Chicken Manure: Composted chicken manure provides nutrients to the microgreens and improves soil structure. It is rich in nitrogen, making it ideal for microgreens. But, it has to be well composted before use to ensure it does not burn the plants.
-
Bone Meal: Bone meal is rich in phosphorus, supporting energy transfer in microgreens. While high phosphorous levels aren’t vital for microgreens, bone meal can be used in combination with high-nitrogen fertilizers to maintain a balanced nutrient ratio.
Fertilizing Procedure for Microgreens
To apply fertilizer to your microgreens, mix the chosen organic fertilizer into the potting soil or growing medium before planting your seeds. Remember always to stick to the manufacturer’s recommended quantity.
Since microgreens are harvested early, top dressing or additional applications of fertilizer after planting may not be necessary. However, in the case of slow-release organic fertilizers like composted manure, an additional layer of fertilizer can be beneficial after 1-2 weeks.
In conclusion, when it comes to fertilizing microgreens, the primary objective is choosing a gentle, safe, yet effective nutrient boost that aids their fast growth without introducing harmful chemicals. Organic options are ideally the safer, more beneficial choice for both the microgreens and the consumer. Knowing which nutrients your greens need and how different fertilizers serve these needs gives you the upper hand in producing healthy, nutrient-rich microgreens.
