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  1. Vol. 27 No. 3, p. 572-575
     
    Received: Mar 16, 1986
    Published: May, 1987


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doi:10.2135/cropsci1987.0011183X002700030031x

Effects of Nitrogen Fertilizer Rate, Seeding Rate, and Row Spacing on Semidwarf and Conventional Height Spring Oat1

  1. H. G. Marshall,
  2. F. L. Kolb and
  3. G. W. Roth2

Abstract

Abstract

Lodging may cause serious grain losses when conventional height oat (Avena sativa L.) plants are grown at high levels of soil fertility in humid regions. The use of semi dwarf cultivars could alleviate this problem, but because none have been available, little is known about their potential value. Our objective was to compare conventional height ‘Ogle’ to semi dwarf ‘Pennlo’ oats when grown at different management levels. In 1982 and 1983, the two cultivars were grown near University Park, PA, in a factorial experiment with row spacings of 13 and 18 cm, seeding rates of 67, I01, and 134 kg ha-1, and N rates of 67, I01, and 134 kg ha-1. Overall, Ogle yielded 18% more grain and 29% more straw than Pennlo in 1982 and 13% more grain and 33% more straw in 1983. The semidwarf was 27% shorter than Ogle and did not lodge. Ogle lodged severely in some treatments, but this occurred too late to limit yield. Grain yield increases in response to reduced row spacing were similar for Ogle and Pennlo (6.2 and 9.6% for the 2 yr). With the exception of Pennlo in 1982, grain yield of both cultivars was increased by using a seeding rate of I01 kg ha-1. A high seeding rate increased the test weight of both cultlvars and the lodging of Ogle. Increasing N rate from 67 to 134 kg ha-1 increased grain yield of both cultivars. Considering all management levels over the 2 yr, there were no major response differences between the conventional height and the semi dwarf cultivars.

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