Organic vs Inorganic Fertilizer for Palay: Which Is Better?

Farmers hear two stories. One says chemical abono ruins the soil. The other says organic farming cannot feed a hectare of rice. Both miss the point, because rice takes up nitrogen, phosphorus and potassium in the same mineral forms whatever the source. What differs is how much nutrient each sack holds, how fast it works and what it does to the soil.

Our guides to organic fertilizer examples and inorganic fertilizer examples describe each product. This page puts the two side by side for palay.

• Inorganic fertilizer is fast, and urea gives nitrogen at about PHP 97 a kilo.
• Organic fertilizer is slow and weak per sack, but it feeds soil life and holds water.
• Straw and azolla can each supply about 30 kg of nitrogen per hectare.
• Homemade fertilizer is a supplement, since a hectare needs tons of it.
• Most farms do best with both, a practice known as balanced fertilization.

Organic vs inorganic fertilizer for palay: the comparison

Figures come from the national standard for organic fertilizer and the weekly price report.

What a kilo of nitrogen really costs

A 50 kg bag of urea holds 23 kg of nitrogen. The national average for prilled urea from October 5 to 9, 2026 was PHP 2,241.41 a bag. So each kilo of nitrogen cost about PHP 97.

An organic fertilizer needs only more than 1.5 percent nitrogen to pass the national standard. Say the label shows 2 percent. Then a 50 kg bag holds just 1 kg of nitrogen, and the whole bag price buys that one kilo. To match one bag of urea, you would need about 23 such bags.

Put plainly, bought inorganic nitrogen usually pays better than bought organic nitrogen. But manure and compost already on the farm can pay their way for part of the crop's need.

What organic fertilizer options work for palay?

Rice straw incorporation

Straw is the cheapest fertilizer you own. A 5 ton harvest, about 100 cavans, leaves about 5 tons of straw. Decomposed back in the field, it can supply about 30 kg of nitrogen, equal to 1.3 bags of urea. Each ton of straw also holds about 16.8 kg of potash (K2O). So burning straw throws away nutrients you already grew.

Azolla

Azolla is a small water fern that floats on paddy water. A blue green alga in its leaves fixes nitrogen from the air. A full azolla cover on one hectare can supply about 30 kg of nitrogen. That can replace at least half of the crop's inorganic nitrogen without lowering the yield. It needs standing water, so it suits irrigated fields.

Green manure

Green manure means plants you plow under, such as sesbania, or the leftover plants of a legume crop like mungbean. In a Philippine field study by Alam and Garrity, published in 1991, these replaced 60 kg of nitrogen per hectare in the next rice crop. Sesbania released its nitrogen fast, so keep the gap between plowing it under and transplanting short.

Compost and chicken manure

At 14 days after transplanting, Abonong Swak plans add 10 bags per hectare of organic fertilizer: well rotted or air dried chicken manure, vermicompost, or an organic fertilizer bought in bags. That goes on top of the inorganic bags, not instead of them. Compost manure first, since fresh droppings can burn roots.

Biofertilizers

Biofertilizers carry living microbes that fix nitrogen or free up soil nutrients. A common one for rice is a locally developed Azospirillum biofertilizer.

In four seasons of Philippine trials reported by Banayo and others in 2012, the best biofertilizer raised irrigated rice yields by 5 to 18 percent a season. Yet the gain was usually below 0.5 ton per hectare. So it can trim the urea bill a little, but it cannot carry the crop alone. Buy only products registered with the Fertilizer and Pesticide Authority.

Can you make homemade or DIY fertilizer for rice?

Yes, but know its limits. Homemade fertilizer is anything you make from farm and kitchen waste: compost, vermicast, fish amino acid or ash. The fertilizer ingredients cost little, and they return organic matter to the soil.

The catch is volume. Most homemade fertilizer carries only a few percent of nutrients, so a hectare of palay needs tons of it. A DIY fertilizer spray such as fish amino acid goes on well diluted, so it is a light supplement. Use DIY fertilizer for the soil and the seedbed, and keep the measured bags for the main feeding.

Sustainable fertilization for rice paddies: use both

For most farms, the best practice is to combine them. Adding organic sources to inorganic fertilizer can save farmers PHP 2,000 to 4,000. Organic fertilizer also improves soil fertility over the long term. See balanced fertilization for rice for the full program.

Alternatives to synthetic fertilizers: can palay go fully organic?

It can, but expect a slow start. In one study, rice fed only by azolla for three seasons reached 4 to 5.3 tons per hectare. Still, the big gain came only after the third crop. Organic fertilizer for farming at this scale has to come mostly from the farm itself, because buying it by the ton costs too much. Selling rice as certified organic has its own rules, covered in our organic fertilizer examples guide.

Plan and price both in anee.io

Mixing the two only pays if you track both. In anee.io, the Protocol Builder puts each task on its day: the straw, the compost, the basal dose and each top dressing. The NPK Plus Calculator adds up the nutrients from every fertilizer you pick, biofertilizers too, and says if the crop is short, right or over.

The farm inventory records each sack of urea or manure with its cost. Next season, Compare Reports puts two seasons side by side.

Questions about organic and inorganic fertilizer