For extended nitrogen feeding, Greenway Biotech Nitroform is the clearest fit: its listed formula provides slow-release nitrogen for three to four months. Simple Lawn Solutions and PetraMax combine quick- and slow-release nitrogen for lawns, while GARDENWISE offers balanced, slow-release nutrition for mixed plantings. CountryMax urea is a high-nitrogen option for rapid growth, not a stated time-release formula. Compare the products by release profile, nutrient balance, and intended use before choosing.
| Product | Best For | Listed Feeding Profile |
|---|---|---|
| Greenway Biotech Nitroform | Longer-lasting nitrogen | Slow release, 3–4 months |
| Simple Lawn Solutions 28-0-0 | Quick lawn green-up plus ongoing feeding | 70% quick, 30% slow release |
| CountryMax Urea 46-0-0 | High-nitrogen feeding | Release duration not stated |
| GARDENWISE 10-10-10 | Gardens and mixed plantings | Slow release, up to 8 weeks |
| PetraMax 28-0-0 | Lawns needing quick and sustained growth | 70% quick, 30% slow release |
Greenway Biotech Nitroform 39-0-0
Best for: Lawn and garden buyers seeking a nitrogen-focused product with a longer listed feeding period. Nitroform contains 39% nitrogen, including 28.5% water-insoluble nitrogen, 7.5% water-soluble nitrogen, and 3% urea nitrogen. The product information describes a steady supply for three to four months.
It stands out for its stated slow-release duration and nitrogen breakdown. The listing also says it can reduce thatch development in turf applications and carries less risk of leaching. Choose this if sustained nitrogen is a priority. Limitation: Its 39-0-0 formula supplies no listed phosphorus or potassium, so it is not a balanced, three-nutrient fertilizer.
Simple Lawn Solutions 28-0-0 Liquid Food
Best for: Lawn owners who want quick nitrogen availability and some continued feeding from one liquid application. The 28-0-0 formula is listed as 70% quick-release and 30% slow-release nitrogen. Its attached sprayer is designed for lawn application, and the listed coverage is up to 3,200 square feet when using that sprayer.
Choose this over a fully slow-release option when immediate green-up and ongoing nitrogen are both goals. The product is described for spring and summer use and any grass type. Limitation: The listing does not specify how long the slow-release portion feeds, so it cannot be directly compared with products that state a feeding duration.
CountryMax Urea Fertilizer 46-0-0
Best for: Growers looking for a concentrated nitrogen product for lawns, gardens, crops, trees, or shrubs. This 46-0-0 urea fertilizer is described as supporting rapid plant growth, lush foliage, and green color. The listing presents it as an option for addressing nitrogen deficiencies during active growth.
It is the highest nitrogen analysis among these five products, making it a different choice from fertilizers selected specifically for stated extended-release timing. Choose it when high nitrogen content is the priority. Limitation: The product information does not state that it is slow release or give a feeding duration, so it is not the best match when a documented time-release profile is essential.
GARDENWISE Slow-Release 10-10-10
Best for: Gardeners who want timed feeding with nitrogen, phosphorus, and potassium rather than a nitrogen-only formula. This granular fertilizer contains 10% of each nutrient and is listed as providing up to eight weeks of sustained nutrition. Suggested uses include vegetables, flowers, fruit trees, shrubs, lawns, and potted plants.
Choose it for mixed plantings where balanced nutrition is useful alongside slow-release nitrogen. The listing connects nitrogen with leafy growth, phosphorus with root health, and potassium with plant resilience. Limitation: Its nitrogen concentration is lower than the 28-0-0 and 39-0-0 lawn products, and the small listed package size may not suit large areas.
PetraMax 28-0-0 Liquid Nitrogen Fertilizer
Best for: Lawn owners seeking a liquid product that pairs rapid green-up with continued feeding. PetraMax lists a 28-0-0 formula with 70% quick-release nitrogen and 30% slow-release nitrogen. It is described for warm- and cold-season grass and for both new and established lawns.
This is comparable to the Simple Lawn Solutions product by its stated quick-to-slow nitrogen split. Choose PetraMax if you want a liquid lawn fertilizer presented for multiple grass types. Limitation: The listing does not provide a specific duration for the slow-release portion or a coverage figure.
Buying Guide: How To Choose Time-Release Nitrogen Fertilizer
Do you need quick green-up or longer feeding?
For a clearly stated extended feeding period, compare Greenway Biotech’s three-to-four-month profile with GARDENWISE’s up-to-eight-week claim. The two 28-0-0 liquids split nitrogen between quick- and slow-release forms, but their listings do not state how long the slow-release portion lasts. CountryMax focuses on high nitrogen and rapid growth rather than a stated time-release schedule.
Should you choose nitrogen-only or balanced fertilizer?
Formulas such as 39-0-0, 28-0-0, and 46-0-0 focus on nitrogen. A 10-10-10 formula also supplies phosphorus and potassium. Select according to the nutrients your plants need; do not assume a higher nitrogen percentage means a better overall match for every garden or lawn.
Which application format fits your routine?
Granular products include Nitroform, CountryMax, and GARDENWISE. Simple Lawn Solutions and PetraMax are liquid lawn fertilizers; Simple Lawn Solutions lists an attached sprayer and coverage figure. Check each product’s label for application directions and use rates, since the supplied product details do not provide complete directions for every option.
Frequently Asked Questions
What does time-release nitrogen fertilizer do?
It supplies nitrogen over a period instead of making all of its nitrogen available at once. The stated duration varies by product.
Which product lists the longest feeding period?
Greenway Biotech Nitroform lists a three-to-four-month nitrogen supply, the longest specific duration among these products.
Are quick-release and slow-release nitrogen the same?
No. Quick-release nitrogen is intended for more immediate availability, while slow-release nitrogen feeds over a longer period. Some products combine both types.
Is 46-0-0 urea a time-release fertilizer?
The CountryMax listing identifies 46-0-0 urea and describes rapid growth, but does not state that it is time release or give a feeding duration.
Can a nitrogen fertilizer also provide phosphorus and potassium?
Yes. GARDENWISE 10-10-10 lists 10% nitrogen, 10% phosphorus, and 10% potassium. The 28-0-0, 39-0-0, and 46-0-0 products list nitrogen-only NPK formulas.