Rice
Oryza sativa
About Rice
Rice is the staple food for over half the world's population, providing more than 20% of global human calorie intake. Two major species are cultivated: Oryza sativa (Asian rice, grown worldwide) and O. glaberrima (African rice, grown in West Africa). Rice is typically grown in flooded paddies but can also be grown as upland (rainfed) crop. It is the most important food crop in Asia and increasingly important in sub-Saharan Africa where consumption is rising rapidly. Major producers include China, India, Indonesia, Bangladesh, and Vietnam. Rice production supports the livelihoods of over 1 billion people in Asia alone, making it arguably the most economically important crop on Earth.
Growing Conditions
Full sun — requires high light intensity for optimal tillering and grain fill
Very high water requirement. Paddy rice requires 1,200-2,000 mm per crop. Standing water (5-10 cm) maintained through most of the growing season.
Heavy clay or clay loam that holds water. pH 5.5-6.5. Puddled (saturated) soils ideal for lowland paddy.
Optimal 25-32°C. Sensitive to cold below 15°C (especially at flowering) and extreme heat above 35°C at anthesis.
Tolerates high humidity but this favors blast and sheath blight diseases.
Warm season — 90-180 days depending on variety. Tropical regions may grow 2-3 crops per year.
Step-by-Step Growing Tips
Prepare nursery beds 25-30 days before transplanting
Transplant 2-3 seedlings per hill at 20 × 20 cm spacing
Maintain 5-10 cm water depth from transplanting to 2 weeks before harvest
Apply nitrogen in 3 splits: basal, tillering, and panicle initiation
Drain fields 2 weeks before harvest to facilitate drying and harvesting
Use certified seed of recommended varieties for your region
Disease Risks to Watch
All diseases →Rice blast is caused by Magnaporthe oryzae, the most destructive rice disease globally. It produces diamond-shaped gray lesions on leaves and can rot the panicle neck, causing total grain loss. Manage with resistant varieties, balanced nitrogen fertilization, silicon amendments, and fungicide applications of tricyclazole or azoxystrobin at panicle initiation.
Rice bacterial leaf blight (Xanthomonas oryzae pv. oryzae) causes water-soaked yellow-green lesions advancing from leaf tips that dry to grayish-white. Yield losses reach 20-50%. Manage with resistant varieties (Xa4, Xa21 genes), balanced nitrogen, avoid flooding damage to leaves, and copper sprays. The kresek phase can kill young seedlings entirely.
Rice sheath blight (Rhizoctonia solani) causes oval gray-green water-soaked lesions on leaf sheaths that enlarge with gray centers and brown borders. Sclerotia float in paddy water and infect at the waterline. Manage with moderate nitrogen, avoiding excess plant density, validamycin or azoxystrobin fungicide at panicle initiation, and incorporating crop residues after harvest.
Companion Planting
✅ Good Companions
Growing Zones
Frequently Asked Questions
When is the best time to plant Rice?
Warm season — 90-180 days depending on variety. Tropical regions may grow 2-3 crops per year.
What soil does Rice need?
Heavy clay or clay loam that holds water. pH 5.5-6.5. Puddled (saturated) soils ideal for lowland paddy.
How much water does Rice need?
Very high water requirement. Paddy rice requires 1,200-2,000 mm per crop. Standing water (5-10 cm) maintained through most of the growing season.
What are the most common diseases affecting Rice?
The most common diseases are: rice blast, rice bacterial leaf blight, rice sheath blight. Monitor regularly and practice crop rotation.
What plants grow well with Rice?
Good companions include: azolla, duckweed. Avoid planting near no specific plants.
Related Crops — Poaceae
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