Fertilizers background
Fertilizer guide for real farms

Understand the main fertilizers you will use

See how each fertilizer supports your crops in Oman – from NPK blends and micronutrients to organic compost and soil conditioners – with examples of where they fit best.

Ammonium Nitrate

Broadcast, Side dressing, Fertigation
Winter_Spring ammonium_nitrate

Fast-acting nitrogen fertilizer providing both ammonium and nitrate forms for quick and sustained uptake in cereals (wheat, barley, corn), forage crops, and vegetables when strong vegetative growth is required.

Typical rate

50-120 kg per hectare

Good for

Cereals, Forage crops, Vegetables

Ammonium Sulfate

Broadcast, Side dressing, Fertigation
Winter_Spring ammonium_sulfate

Nitrogen and sulfur fertilizer commonly used to boost vegetative growth and improve protein content in cereals (wheat, barley, corn), forage crops (alfalfa, grasses), and leafy vegetables grown on alkaline soils.

Typical rate

60-120 kg per hectare

Good for

Cereals, Forage crops, Leafy vegetables

Boron Fertilizer

Foliar spray, Soil application
All seasons boron_fertilizer

Micronutrient fertilizer supplying boron, important for flowering, fruit set, and sugar transport in crops such as grapes, citrus, pomegranate, almonds, and many vegetables and oilseed crops.

Typical rate

0.5-2 kg per hectare in foliar or soil applications

Good for

Grapes, Citrus, Pomegranate, Almonds, Vegetables, Oilseed crops

Calcium Nitrate

15-15.5% N, 0-0% P, 0-0% K Foliar spray, Fertigation, Side dressing
Spring/Summer calcium_nitrate

Water-soluble fertilizer providing both nitrogen and calcium. Helps prevent blossom-end rot and tip burn in tomato, pepper, eggplant, lettuce, and other leafy or fruiting vegetables, and supports strong cell walls in fruit trees.

Typical rate

50-100 kg per hectare

Good for

Tomatoes, Peppers, Fruits, Vegetables

DAP (Diammonium Phosphate)

17-18% N, 45-46% P, 0-0% K Broadcast, Band placement
All seasons dap

High phosphorus fertilizer (18% N, 46% P2O5). Excellent for root development and flowering in fruit trees (pomegranate, citrus, mango), vegetable transplants (tomato, pepper, eggplant), and field crops at planting (wheat, barley).

Typical rate

50-100 kg per hectare

Good for

Wheat, Corn, Vegetables, Fruits

Foliar NPK 20-20-20

19-21% N, 19-21% P, 19-21% K Foliar spray
All seasons foliar_npk_20_20_20

Fully soluble foliar NPK fertilizer used to quickly correct nutrient deficiencies during active growth in vegetables (tomato, cucumber, pepper, leafy greens), fruit trees (citrus, mango, grapes), and greenhouse crops.

Typical rate

1-3 kg per 1000 L of water

Good for

Vegetables, Fruit trees, Greenhouse crops

Gypsum (Calcium Sulfate)

Broadcast on soil surface, Incorporation into soil
All seasons gypsum_calcium_sulfate

Soil amendment that provides calcium and sulfur while helping to improve soil structure, reduce sodicity, and enhance root growth in orchards, field crops, and vegetables grown on sodic or compacted soils.

Typical rate

0.5-5 tons per hectare depending on soil test and sodicity level

Good for

Orchards, Field crops, Vegetables

Humic Acid

Broadcast on soil, Incorporation into soil, Fertigation
All seasons humic_acid

Organic soil conditioner that improves soil structure, water-holding capacity, and nutrient availability in orchards, open-field vegetables, greenhouse crops, and field crops grown on sandy or degraded soils.

Typical rate

10-30 kg per hectare or 10-20 L per hectare for liquid forms

Good for

Orchards, Vegetables, Greenhouse crops, Field crops

Iron Chelate (Fe-EDDHA / Fe-EDTA)

Soil application, Fertigation
Spring/Summer iron_chelate

Specialized iron fertilizer used to correct iron deficiency chlorosis in sensitive crops such as citrus, grapes, pomegranate, strawberry, and high-value vegetables grown on calcareous or alkaline soils.

Typical rate

5-15 kg per hectare

Good for

Citrus, Grapes, Pomegranate, Strawberry, Vegetables

MAP 12-61-0 (Mono Ammonium Phosphate)

Fertigation, Band placement
All seasons map_12_61_0

Highly soluble phosphorus fertilizer used at early growth stages and in fertigation systems for vegetables (tomato, pepper, cucumber), fruit trees (citrus, mango, grapes), and field crops (wheat, corn) to promote strong roots and early flowering.

Typical rate

20-50 kg per hectare

Good for

Vegetables, Fruit trees, Cereals

MOP 0-0-60 (Muriate of Potash)

Broadcast, Side dressing
All seasons mop_0_0_60

Concentrated potassium fertilizer widely used to improve yield and fruit size in field crops (wheat, barley, corn), potatoes and root crops (potato, carrot), and many open-field vegetables and fruit trees where chloride is not a concern.

Typical rate

40-100 kg per hectare

Good for

Cereals, Root and tuber crops, Vegetables, Fruit trees

Magnesium Sulfate (Epsom Salt)

Broadcast, Fertigation, Foliar spray
All seasons magnesium_sulfate

Soluble source of magnesium and sulfur to prevent leaf yellowing and improve chlorophyll formation in leafy vegetables (lettuce, spinach, cabbage), fruit trees (citrus, mango, banana), and field crops (wheat, barley, corn) grown on sandy or calcareous soils.

Typical rate

20-60 kg per hectare

Good for

Leafy vegetables, Fruit trees, Cereals

Micronutrient Mix

Foliar spray, Fertigation
All seasons micro_nutrient_mix

Blended fertilizer containing essential trace elements such as iron, zinc, manganese, and boron, used to correct hidden hunger in vegetables, fruit trees, and field crops that show pale, deformed, or poorly set growth.

Typical rate

1-3 kg per hectare in foliar sprays

Good for

Vegetables, Fruit trees, Cereals

NPK 12-32-16 (Starter)

11-13% N, 30-34% P, 15-17% K Band placement at planting, Fertigation at early stages
All seasons npk_12_32_16

High-phosphorus starter fertilizer used at planting to support strong root development in fruit trees (citrus, mango, pomegranate), vegetable seedlings and transplants (tomato, pepper, eggplant), and field crops at establishment (wheat, barley, corn).

Typical rate

30-70 kg per hectare at planting

Good for

Fruit trees, Vegetables, Cereals

NPK 15-15-15

14-16% N, 14-16% P, 14-16% K Broadcast, Side dressing
All seasons npk_15_15_15

Balanced NPK fertilizer suitable for general maintenance of many crops during the growing season, including vegetables (tomato, cucumber, zucchini, okra), fruit trees (date palm, citrus, banana), and forage or green fodder (alfalfa, barley).

Typical rate

40-80 kg per hectare

Good for

Vegetables, Fruits, Forage crops

NPK 15-5-30 (High K)

14-16% N, 4-6% P, 29-31% K Broadcast, Fertigation, Side dressing
Spring/Summer npk_15_5_30

High-potassium fertilizer recommended during fruiting and late growth stages for fruit trees (date palm, citrus, mango, banana) and vegetables (tomato, pepper, eggplant, cucumber) to improve fruit size, color, and shelf life.

Typical rate

40-90 kg per hectare

Good for

Fruit trees, Vegetables

NPK 20-20-20

19-21% N, 19-21% P, 19-21% K Broadcast, Side dressing, Foliar
All seasons npk_20_20_20

Balanced fertilizer containing equal parts of Nitrogen (N), Phosphorus (P), and Potassium (K). Suitable for general crop nutrition, especially vegetables (tomato, cucumber, lettuce), fruit trees (date palm, citrus, mango), and field crops (wheat, barley, corn).

Typical rate

50-100 kg per hectare

Good for

Wheat, Corn, Vegetables, Fruits

Organic Compost

1-3% N, 0.5-2% P, 1-2% K Broadcast, Incorporation into soil
All seasons compost

Organic fertilizer rich in nutrients and organic matter. Improves soil structure and fertility in orchards (date palm, mango, citrus, pomegranate), open-field vegetables (tomato, cucumber, cabbage), and greenhouse crops.

Typical rate

5-10 tons per hectare

Good for

All crops

Potassium Nitrate (KNO3)

Fertigation, Foliar spray (at lower doses)
All seasons potassium_nitrate

Water-soluble fertilizer providing both nitrogen and potassium, widely used in fertigation for fruiting crops such as tomato, pepper, cucumber, grapes, citrus, and strawberries to improve yield, sugar content, and fruit quality.

Typical rate

30-80 kg per hectare via fertigation

Good for

Tomato, Pepper, Cucumber, Grapes, Citrus, Strawberries

Potassium Sulfate

0-0% N, 0-0% P, 48-52% K Broadcast, Side dressing
Spring/Summer potassium_sulfate

High potassium fertilizer (50% K2O, 18% S). Promotes fruit quality and disease resistance in fruit trees (date palm, citrus, mango, banana), potatoes and root crops (potato, carrot), and high-value vegetables (tomato, pepper, eggplant).

Typical rate

50-100 kg per hectare

Good for

Fruits, Vegetables, Potatoes

SOP 0-0-50 (Sulphate of Potash)

Broadcast, Side dressing, Fertigation
All seasons sop_0_0_50

Chloride-free potassium fertilizer preferred for sensitive crops such as grapes, citrus, strawberries, potatoes, and greenhouse vegetables where excess chloride can reduce quality or yield.

Typical rate

40-90 kg per hectare

Good for

Grapes, Citrus, Strawberries, Potatoes, Vegetables

Seaweed Extract

Foliar spray, Fertigation
All seasons seaweed_extract

Biostimulant made from seaweed that supports root growth, flowering, fruit set, and stress tolerance in vegetables, fruit trees, greenhouse crops, and turf.

Typical rate

1-5 L per hectare in foliar or fertigation applications

Good for

Vegetables, Fruit trees, Greenhouse crops, Lawns and turf

Slow-Release Nitrogen (Urea Formaldehyde)

Broadcast on soil surface, Incorporation into soil
All seasons slow_release_n_urea_formaldehyde

Slow-release nitrogen fertilizer that provides a steady supply of N and reduces leaching losses, ideal for turf, forage grasses, orchards, and long-season crops where controlled nitrogen release is beneficial.

Typical rate

50-120 kg per hectare per application

Good for

Forage crops, Lawns and turf, Fruit trees, Long-season crops

Urea

45-46% N, 0-0% P, 0-0% K Broadcast, Side dressing
Spring/Summer urea

High nitrogen fertilizer (46% N). Fast-acting nitrogen source for rapid vegetative growth in leafy vegetables (lettuce, spinach, cabbage), cereals (wheat, barley, corn), and fodder crops (alfalfa).

Typical rate

100-200 kg per hectare

Good for

Wheat, Corn, Rice, Vegetables

Zinc Sulfate

Foliar spray, Soil application
All seasons zinc_sulfate

Zinc fertilizer used to prevent stunted growth, small leaves, and poor bud development caused by zinc deficiency in fruit trees, cereals, vegetables, and legumes.

Typical rate

2-5 kg per hectare in foliar or soil applications

Good for

Fruit trees, Cereals, Vegetables, Legume crops

Frequently Asked Questions

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Find answers to common questions about Zarraak and how it can help manage your farm.