Effect of time of seeding on yield, milling quality, and other characters in rice
1940
Adair, C.R.
The results of a date of seeding experiment with 15 varieties of rice are reported. In response to date of seeding the varieties grown were grouped as (a) "sensitive" or (b) "indifferent." The "sensitive" varieties showed a gradual but marked decrease, ranging from 18 to 26%, in the number of days required to reach maturity when sown on successively later dates, and the "indifferent" varieties showed a small but less consistent shortening of the growth period, ranging from 9 to 15%, as sowing was delayed. The "sensitive" varieties showed a gradual reduction in height from the first to the last date of seeding, whereas the "indifferent" varieties were variable, and, with certain exceptions, showed no consistent reduction in height due to delayed seeding. Most varieties produced more straw in proportion to grain when sown in April than when sown in May or June. The highest yields for the "sensitive" varieties and Zenith were obtained from seeding in May, and for the "indifferent" varieties, Arkansas Fortuna, and Nira, late in April or early May. Most of the early and midseason varieties produced rice of better milling quality when they matured late in September or early in October than when they matured before September 15. The data indicate that for best yields Supreme Blue Rose, Acadia, Caloro X Blue Rose, Kameji X Blue Rose, Arkansas Fortuna, and Nira should be sown before Zenith, Early Prolific, Colusa, Edith X Fortuna, and Improved Blue Rose X Fortuna. If sown in this order, the early varieties will mature before the late varieties. If this schedule were followed, none of the varieties would mature during the hot weather, but all would usually mature before bad weather begins and frost occurs in the fall.
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