Lush meadow with balanced grasses and legumes, nourished by fertilizer.

Unlock Lush Meadows: How Fertilization Impacts Grass and Legume Balance

Lena Kashyap monogram
Lena Kashyap in Climate & Environment October 2026 • 4 min read.

"Discover the secrets to optimizing vegetation cover in temporary meadows through strategic fertilization and species selection."


Achieving a balanced and thriving meadow ecosystem requires careful consideration of fertilization techniques and the selection of appropriate plant species. Perennial legumes and grasses respond differently to nutrient applications, making a tailored approach essential for maximizing growth and biodiversity.

Nitrogen fertilizers, when applied to a phosphorus and potassium-rich base, can create synergistic interactions that promote robust plant development. Phosphorus supports legume growth, while nitrogen fuels grasses, leading to a mutually beneficial relationship where legumes naturally provide nitrogen to the soil, reducing the need for excessive fertilization.

Changes in temporary meadows are inevitable due to environmental factors, agricultural practices, and the competitive nature of different species. Understanding these dynamics is crucial for maintaining a healthy and productive vegetation cover. Research conducted at the Agricultural Research – Development Station Secuieni in 2013-2014 investigated the effects of fertilization on various perennial grass and legume mixtures, providing valuable insights into optimizing meadow management.

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Evidence from Meadow Fescue Systems

A two-year study conducted in 2023–2024 at the University of Wisconsin Marshfield Agricultural Research Station compared three meadow fescue grazing systems: meadow fescue with nitrogen fertilizer (MF+N), meadow fescue with clover (MF+Clover), and non-N-fertilized meadow fescue (MF). The MF+N treatment received 157 kg N/ha/yr. The research evaluated Holstein heifers grazing these systems, while a separate five-year experiment across three sites examined legume-grass seeding ratios and phosphorus fertilization. Together, these studies show that grass-legume balance and fertilizer management are being assessed through field-based comparisons rather than assumed outcomes.

Established Methods, Uncertain Rates

Native grass-legume mixed reseeding combined with fertilization has been reported to improve plant community productivity, topsoil fertility, and forage nutritional quality in degraded typical steppes. Research on cultivated grasslands in the Loess Plateau identifies the appropriate nitrogen fertilizer amount for grass-legume mixtures as still uncertain. Other work examines how nitrogen fertilization relates to forage yield and soil enzymes in legume-grass mixtures. These findings support mixed reseeding and fertilization as established approaches while highlighting that fertilizer rates and management outcomes remain context-dependent.

From Grazing History to Interseeding

Research in meadow steppe ecosystems found that grazing history negatively affected aboveground net primary productivity and species richness, while moderate grazing could offset these legacy effects and promote restoration. More recent pasture-improvement work compares no-till and frost-seeding methods for introducing clovers or chicory into established meadow fescue monocultures. Another field experiment assessed undersowing valuable grass and legume species in permanent meadows for effects on yield, quality, and ensilage usefulness. Together, these studies mark a progression from understanding grazing legacies to testing practical methods for rebuilding productive mixed swards.

The Sweet Spot: Balancing Grasses and Legumes Through Fertilization

Lush meadow with balanced grasses and legumes, nourished by fertilizer.

The study examined five different mixtures of perennial grasses and legumes, assessing how nitrogen fertilizers influenced vegetation structure on a phosphorus-enriched foundation. The results indicated a clear trend: as the growing season progressed from the first to the third cut, the proportion of grasses decreased while the proportion of legumes increased.

Increasing the dose of nitrogen fertilizer amplified the competitiveness of grasses, often at the expense of legumes and other plant species. This highlights the delicate balance required to maintain a diverse and resilient meadow ecosystem. Careful management of nitrogen inputs can promote the desired composition of grasses and legumes, optimizing the meadow for specific agricultural or environmental goals.

  • Species Selection Matters: The specific types of grasses and legumes in the mixture significantly influenced the outcome. Different species exhibit varying levels of competitiveness and responsiveness to fertilization.
  • Timing is Key: The timing of nitrogen application also played a crucial role. Applying nitrogen at different stages of growth can favor either grasses or legumes, depending on their respective nutrient requirements.
  • Environmental Conditions: Climatic factors such as temperature and rainfall interacted with fertilization to affect vegetation dynamics. Understanding these interactions is essential for adapting management practices to local conditions.
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Productivity in Grass-Legume Mixtures

Research on Festuca arundinacea and Trifolium pratense reports that perennial grass-legume mixtures are associated with increased productivity and higher grass protein content in the presence of legumes. A separate study in the center of Moldova examined five perennial grass and legume mixtures under nitrogen fertilizers applied on a phosphorus agrofond during 2013–2014. That work focused on how fertilization influenced vegetation-cover structure in temporary meadows. These studies connect mixture composition and fertilizer management with forage productivity, nutritional value, and vegetation structure.

Fertilizer Effects Are Not Uniform

An experiment comparing ammonium sulfate and calcium nitrate assessed their effects in mixed and monocropped systems involving Trifolium pratense and grasses. The study frames legumes as contributors of biologically fixed nitrogen and grasses as contributors to canopy formation and weed suppression, but its design shows that fertilizer responses must be tested across both mixture and monocrop arrangements. Long-term results from the Admont Grassland Experiment likewise show that different fertilization treatments affected soil pH, soil nutrient concentrations, and plant species composition. These findings caution against treating fertilization as a universally beneficial intervention with identical ecological effects.

Mixture Composition and Nitrogen

A two-year field experiment examined how mixture composition and legume-grass seeding ratio affected biomass yield and the nutritional quality of legume-grass mixtures. The study was designed to address the effects of these composition choices rather than considering nitrogen fertilization alone. This comparison is relevant because changing the balance between legumes and grasses can alter both harvested biomass and forage quality. The available source reports the experimental focus but does not provide specific comparative results in the supplied summary.

For example, in mixtures with 20% grasses and 80% legumes (specifically, 20% Dactylis glomerata + 80% Medicago sativa), the floristic composition in 2014 was heavily influenced by the balance between these species. Similarly, mixtures with 65% grasses and 35% legumes (30% Bromus inermis + 35% Dactylis glomerata + 35% Onobrychis viciifolia) showed that the proportion of grasses ranged from 26% to 75%, depending on the nitrogen fertilization level.

Sustainable Meadows: Practical Takeaways

The research underscores the importance of a balanced approach to fertilization in temporary meadows. While nitrogen is essential for grass growth, excessive application can suppress legume development and reduce overall biodiversity. Understanding the specific needs of different grass and legume species is crucial for optimizing vegetation cover.

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Testing Mixtures Under Nitrogen Inputs

Research on mixing grasses and legumes asks whether mixtures produce higher herbage yields than monocultures under nitrogen fertilization. The study treats nitrogen level as an important condition when evaluating the forage benefits of mixed stands. Its focus reflects a broader systems challenge: fertilizer management may influence whether the expected advantages of grass-legume mixtures emerge. The supplied source does not report a specific yield result or nitrogen rate.

Managing Cultivated Grasslands

Research on the Loess Plateau notes that most grazing studies have focused on natural grasslands, leaving fewer studies of grazing management in cultivated grasslands. The appropriate amount of nitrogen fertilizer for cultivated grass-legume mixtures remains uncertain. This limitation directly affects practical decisions about managing forage systems for grazing. The source therefore emphasizes the need for management guidance grounded in cultivated-grassland conditions rather than relying only on natural-grassland research.

Farmers and land managers can use these findings to tailor their fertilization strategies to achieve specific goals, whether it's maximizing forage production, enhancing soil health, or promoting a diverse and resilient meadow ecosystem. Regular monitoring of vegetation composition is essential for adapting management practices to changing environmental conditions.

By carefully considering the interactions between fertilization, species selection, and environmental factors, it’s possible to create and maintain thriving meadows that support sustainable agriculture and contribute to a healthy environment. The insights gained from this study can inform best practices for meadow management in the Center of Moldova conditions and beyond.

How this meadow study fits with forage comparisons

A global comparison found higher net primary productivity in legume-associated stands than in sole-grass controls, including controls both with and without nitrogen fertilizer.[1]

Across sites and years, stands with legumes making up about a third of the mixture had nitrogen acquisition near the highest observed and above that of grass monocultures.[2]

Vegetation-cover structure across fertilized perennial mixtures

Populationfive mixtures of perennial grasses and legumes[3]
SettingS.C.D.A. Secuieni conditions[3]
Duration2013-2014[3]
Comparisondifferent nitrogen fertilizer doses on a phosphorus agrofond[3]
Main outcomestructure of vegetation cover[3]
Times cited0[3]

Yield and protein figures from a separate mixture experiment

  • 13.88 t·ha−1·year-1For mixture A1, the reported forage yield under N2 was 13.88 t ha−1 year−1; this was higher than the other nitrogen inputs in that comparison.[4]
  • 14.39 t·ha−1·year-1For mixture A2, yield under N3 was 14.39 t ha−1 year−1, compared with 13.80 t ha−1 year−1 under N2; the source says the N3 result was not substantially greater.[4]Caveat: The N3 yield was not substantially greater than the N2 yield.

What the comparison says about mixture performance

The yield comparisons show that the mixture with the better result depended on which mixture and nitrogen input were being compared; a larger input did not guarantee a meaningful gain in every case.[4]

Protein results add a different dimension: mixtures could have higher grass protein than grass monocultures, so yield alone does not describe the reported forage differences.[4] [5]

What remains unresolved about nitrogen and mixture balance

  • How might the apparent balance shift when legumes contribute very little to harvested biomass, as occurred in a grass-dominated forage experiment?[6] [7]
  • Can reduced fertilizer nitrogen maintain yield across settings, given reports of nitrogen supplied by legumes and a site-specific yield match between clover mixtures and fertilized grass monocultures?[8] [9]

Terms used in the comparisons

Net primary productivity
Total aboveground production response of grass and legume in higher-diversity treatments.[1]

Sources

  1. Global meta-analysis reveals agro-grassland productivity varies based on species diversity over time (pmc.ncbi.nlm.nih.gov)
  2. Nitrogen yield advantage from grass-legume mixtures is robust over a wide range of legume proportions and environmental conditions. (pubmed.ncbi.nlm.nih.gov)
  3. The Influence of Fertilization and Perennial Grasses and Legumes Mixture on the Structure of Vegetation Cover in Temporary Meadows, under the Center of Moldova Conditions | Bulletin of University of A (doi.org, 2015)
  4. Mixed legume–grass seeding and nitrogen fertilizer input enhance forage yield and nutritional quality by improving the soil enzyme activities in Sichuan, China (pmc.ncbi.nlm.nih.gov)
  5. SPECIES PRODUCTIVITY RESEARCH FOR Festuca arundinacea Schreb AND Trifolium pratense L. CULTIVATED ALONE OR IN SIMPLE MIXTURES, IN THE FIRST YEAR OF VEGETATION, UNDER THE CONDITIONS OF THE MOLDAVIAN FOREST-STEPPE
  6. Nitrogen fertilizer rate effects on yield and botanical components of summer annual forage mixtures - (scholars.uky.edu)
  7. Fertilization of Hay and Pastures in North Carolina | NC State Extension Publications (content.ces.ncsu.edu)
  8. Potential of legume-based grassland–livestock systems in Europe: a review (pmc.ncbi.nlm.nih.gov)
  9. Grass-clover response to cattle slurry N-rates: Yield, clover proportion, protein concentration and estimated N2-fixation (pure.au.dk)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.15835/buasvmcn-agr:11445, Alternate LINK

Title: The Influence Of Fertilization And Perennial Grasses And Legumes Mixture On The Structure Of Vegetation Cover In Temporary Meadows, Under The Center Of Moldova Conditions

Subject: General Medicine

Journal: Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture

Publisher: University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca

Authors: Margareta Naie, Vasile Vintu, Elena Trotus, Simona Florina Pochiscanu

Published: 2015-11-27

Everything You Need To Know

1

What is the role of fertilization in meadow management?

Fertilization in temporary meadows involves applying nutrients like nitrogen, phosphorus, and potassium to the soil to enhance plant growth. The article emphasizes that nitrogen fertilizers boost grass development. The research indicates that when nitrogen fertilizers are used in conjunction with phosphorus and potassium, they can lead to synergistic interactions, which means the plants benefit from the presence of both nutrients. The goal is to optimize vegetation cover and promote a balanced ecosystem of grasses and legumes. Excess application of nitrogen can suppress legume development, affecting the biodiversity.

2

Why is it important to balance grasses and legumes in meadows?

The balance between grasses and legumes is crucial because they have different responses to fertilization. Nitrogen fertilization primarily benefits grasses, while phosphorus supports legume growth. When the application of nitrogen is high, grasses can outcompete legumes, reducing the meadow's diversity. Managing the amount of nitrogen applied can help maintain the desired composition of grasses and legumes, which is important for both agricultural productivity and environmental sustainability.

3

How does species selection affect meadow vegetation?

The specific types of grasses and legumes in a mixture significantly impact the outcome. The article points out that different species show varied levels of competitiveness and responsiveness to fertilization. For instance, mixtures of 20% Dactylis glomerata and 80% Medicago sativa saw changes in their composition. Similarly, mixtures including Bromus inermis, Dactylis glomerata, and Onobrychis viciifolia showed varying grass proportions based on nitrogen levels. Therefore, selecting the right combination of species is vital for optimizing meadow management and achieving desired vegetation structure.

4

How does the timing of nitrogen application impact grass and legume balance?

The timing of nitrogen application affects the balance between grasses and legumes. Applying nitrogen at different growth stages can favor grasses or legumes. The article mentions how, as the growing season progresses from the first to the third cut, the proportion of grasses generally decreases. This highlights that the timing of fertilization can be used to manage the competition and proportion of grasses and legumes, depending on the needs of the plants.

5

Why are environmental conditions important when considering fertilization?

Environmental conditions, such as temperature and rainfall, interact with fertilization to affect vegetation dynamics in meadows. Understanding these interactions is essential for adapting management practices to local conditions. For example, the Agricultural Research – Development Station Secuieni study from 2013-2014 showed how these factors influence the effectiveness of fertilization strategies, highlighting the need for a tailored approach that considers the specific environment to achieve a thriving meadow ecosystem.

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