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Agronomy Journal Abstract -

Seeding Rate and Row Spacing Effects on Yield and Yield Components of Drill-Seeded Rice1


This article in AJ

  1. Vol. 79 No. 4, p. 623-626
    Received: Sept 18, 1986

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  1. D. B. Jones and
  2. G. H. Snyder2



Although plant population effects on crop performance have been thoroughly investigated in transplanted rice (Oryza sativa L.), less information is available for drill-seeded rice. Previous studies evaluating the response of rice cultivars to various seeding rates and row spacings were performed before semi-dwarf cultivars were available in areas where drill-seeding is practiced. Two contrasting plant types, tall (cv. Lebonnet) and semi-dwarf (cv. Bellemont and Lemont), were drill-seeded at rates of 50, 100, and 150 kg seed ha−1 in 0.15-, 0.20-, and 0.25-m row spacings in three tests conducted on an organic soil. Narrow row spacings increased grain yield for both plant types when reproductive growth occurred during a period of relatively high solar radiation and moderate temperatures. Increased seeding rates increased panicles per square meter in all tests for both plant types. This increase was compensated for by decreased rilled grain number per panicle, resulting in no significant yield differences among seeding rates. It appears that seeding rates of 80 to 100 kg ha−1 are sufficient to obtain optimum stands in southern Florida.

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