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Influence of Seedling Age at Transplanting on Rice Performance 1
Author(s) -
Sanchez P. A.,
L. N. Larrea
Publication year - 1972
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1972.00021962006400060039x
Subject(s) - transplanting , panicle , seeding , seedbed , seedling , oryza sativa , agronomy , biology , dry matter , yield (engineering) , horticulture , biochemistry , gene , materials science , metallurgy
With the advent of high‐yielding rice ( Oryza sativa L.) varieties on the cost of Peru, the question arose as to how these short‐statured plant types react to delays in transplanting, a common situation in the field because of uncertain water supply. A field experiment conducted in Lambayeque, Peru evaluated two short‐statured varieties, ‘IR8’ and ‘IR5,’ with the tall, traditional ‘Minabir’ variety at transplanting dates from 30 to 105 days after seeding and at three seedbed growth rates. IR8 produced the highest grain yield (12.0 tons/ha) when transplanted at 30 days after seeding. Yields decreased linearly at the rate of 125 kg/ha per day of delayed transplanting beyond 30 days. Minabir showed less‐pronounced yield decreases up to 75 days after seeding. Slowing seedbed growth of IR8 through water and N stress produced significant yield increases when transplanted at 75 and 90 days after seeding. Delayed transplanting reduced plant height and dry matter production, caused flowering shortly after transplanting in some cases, and decreased panicle production and the number of fertile grains per panicle. Seeding density had no effect on yields. The experiment showed that the short‐statured plant types are more sensitive to delays in transplanting than the tall ones, but that the new varieties can outyield the tall varieties when transplanted up to 90 days after seeding.