The age of the double-season rice is about 28 to 30 days, and the age of the middle rice is generally more than 30 days. Because the early and medium-season rice pods are short in age and require fast and strong seedling growth, but the breeding season is also when the temperature is low, the nutrients in the soil are released and the fertilizer is decomposed slowly. Therefore, high-quality and quick-acting fertilizers such as human waste and grass ash should be reused. The easily decomposed young green manure and other organic fertilizers are used as basic fertilizers in Putian.

The nutrients needed for the paddy rice field stage were nitrogen, followed by phosphorus, potassium and other nutrients. Therefore, simply relying on organic fertilizers can not meet the requirements of seedling growth in time and quantity, and must apply nitrogen, phosphorus, and potassium fertilizers in a timely and appropriate manner.

In the past, nitrogen fertilizers were generally used as topdressing fertilizers. However, research and practice in recent years have proved that under a shortage of organic fertilizers, the application of a certain amount of nitrogen fertilizer as a base fertilizer works well, and it can achieve the effect of fertilizer and soil and soil fertilizer seedlings. The fertilizer is balanced and the seedlings grow robustly and neatly. It is also very important that early and medium rice fields are topdressed according to the seedlings' appearance. The first topdressing for weaning fertilizer should be about 15 days after planting, that is, when the seedlings have two or three leaves and one heart, Mushi urea 2.5kg or ammonium sulfate about 5kg; the second time is to get up fat (that is, to send the manure) Early rice 2 to 3 days before transplanting, approxi- mately 17.5 kg of ammonium per acre is appropriate.

In the paddy field, although the total amount of phosphorus absorbed is small, phosphorus plays an important role in the proliferation of cells and the development of new roots, especially in the early and mid-season rice breeding seasons, due to the short flood season and low temperature in paddy fields. With a small amount of available phosphorus, increasing the availability of phosphate fertilizer is very important for nurturing the strong maggots. Generally, 25-50kg of superphosphate is applied per acre to make base fertilizer the best.

Potassium is one of the more nutrients needed in the seedling stage. Potassium application in Putian can not only promote the development of roots, improve the amount of seedlings, and promptly restore growth after transplantation, but also can reduce the adverse effects of dark weather and lack of sunlight on photosynthesis, and can improve the cold resistance and disease resistance of seedlings. During the period of early and mid-season rice breeding, when the weather is experiencing low temperatures, and there is more rain and less light, it is particularly important to add potassium fertilizer. The application of potash fertilizer can greatly reduce rotting and breed strong foals to increase yield. The masses have long had the experience of using medium-grain rice ash as a base fertilizer for paddy field in the early and medium-sized rice fields, and the dosage is about 70-100 kg per mu. Due to the addition of ash to the supply of potassium and other nutrients for paddy field, there are also advantages such as covering, absorbing heat, moisturizing, preventing bird harm, loosening soil, and easy to pull seedlings.

With the increase of multiple cropping index, chemical nitrogen, phosphorus, and potassium fertilizers and the increase of production, the zinc deficiency of rice has appeared in some areas of China in recent years, and the effect of applying zinc fertilizer is significant. In zinc-deficient areas, zinc fertilizers are used as surface fertilizers or foliar zinc fertilizers in early and medium rice fields to maintain a certain zinc concentration in the seedlings. This will enable early return to green and early tillering after transplanting, which will help increase yield.

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