Effects of seed maturity on some agronomic characteristics [seed germination, seed vigor, plant height, leaf area, fresh and dry weight of plant parts, and downy mildew infestation] and yield of field corn (Zea mays L.) [Suwan 1 variety]
1982
Pornpreeda Sukprapan
Effects of seed maturity on some agronomic characteristics and yield of field corn (Zea mays L.) were studied at the National Corn and Sorghum Research Center. In order to obtain corn seeds of thirteen different maturities, Suwan 1 was planted in 1979. As seed development proceeded, its moisture content decreased gradually to a value of 31.1 percent at physiological maturity stage. On the contrary, seed dry weight increased with seed developmental stage and reached the maximum during physiological maturity stage. After harvesting of a 1979 trial, seeds were dried to moisture content of 12 percent and stored in cold room for an evaluation in 1980. In 1980, thirteen seed maturity treatments and a check, Suwan 1 seed from the National Corn and Sorghum Research Center, were tested and evaluated both in the laboratory and in the field. Seed germination, seed from the National Corn and Sorghum Research Center, were tested and evaluated both in the laboratory and in the field. Seed germination, seed vigor, plant height, leaf area, fresh and dry weights of plant parts and ear numbers per area increased while downy mildew infestation decreased as age of planted seeds increased. Planting with seeds of different maturities had no effect on flowering and physiological maturity dates. The best period to harvest corn either as grain or seed should be at the stage that seeds are fully matured. In the case which corn have to be harvested as soon as possible, the result suggests that this should not be done before seeds reached stage of 33 days after silking
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