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29 In the early 1990â&#x20AC;&#x2122;s, the 40 kg seeds/ha was demonstrated in the different provinces and municipalities through the Grain Productivity Enhancement Program (GPEP) of the Department of Agriculture. This has contributed to the adoption of lower seeding rates for transplanting from 105 in 1998 to 86 kg/ha in 2000 and from 150 kg to 129 kg/ha for direct seeding in irrigated lowland areas. However, there was no significant change in the seeding rates used in the rainfed direct seeded areas from 1998-2000. Seedling age. As reported by Camus in 1921, the age of seedlings to be transplanted depends on the maturity of the varieties to be planted. For the short-season crop (< 120 days), seedling should be planted when they are 25 days old from sowing. Early maturing varieties (120-145 days) require seedlings that are 30 days old; for 145170 days varieties, seedlings of about 30-35 days old; for 170-180 days varieties, 35 days old seedlings; those that matured over 180 days should be transplanted when seedlings are 40 days old after sowing. However, this classification of varieties based on maturity seemed to have changed in 1949. Seedlings of the early maturing varieties are those mature at 140-160 days and should be transplanted at 20 to 35 days-old while the late maturing varieties are those that matured at 160-180 days and so should be transplanted at 35-42 days old. To date, late maturing varieties that mature in more than five months are now classified as traditional varieties and are usually planted in the upland ecosystems. The classified early maturing varieties now have less than 3 months maturity and can be planted from 18 to 21 days old after sowing. The medium maturing varieties matured in more than 3 months and can also be transplanted when the seedlings are 21 to 25 days old. Both classifications are adopted to lowland rice ecosystems.

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...

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...

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