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39 Direct seeding of rice is better established in the dry season to avoid damage from rainfall, pests, and diseases that are more prevalent during the wet season. At present, the combined method of transplanting (for wet season) and direct seeding (for dry season) is practiced in many irrigated areas. Some fields with good drainage, however, practice wet direct seeding of rice irrespective of season mainly as a method to save on time, labor, and costs. Consistently, high seeding rate, ranging from 150 to 250 kg/ha, is used in the direct seeding method of establishment regardless whether they are sown in the irrigated or in the rainfed ecosystem to give allowance to plant damage due to rats, birds and golden snails. Machinery for direct seeding. Beginning late 1970s, IRRI had been spearheading in the development of simple hand operated row seeders for direct seeding of pre-germinated paddy grains into the soil surface. The most successful of these efforts is the IRRI drum seeder which a cylinder covered at both ends and having perforations at each end for seeds to come out once the cylinders are rotated by a groundwheel as an operator pulls the machine. To date, this seeder is still becoming popular since it allows farmers to seed in neat rows at lower seed rates of 40 to 80 kg/ha.

Fig. __. The IRRI drum seeder facilitates wet seeding in neat rows with less seeds than broadcast seeding.

The Evolution of Rice Production Practices  
The Evolution of Rice Production Practices  

July 2005 Philippine Institute for Development Studies Surian sa mga Pag-aaral Pangkaunlaran ng Pilipinas For comments, suggestions or furth...