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This article in CS

  1. Vol. 24 No. 1, p. 72-75
     
    Received: Nov 8, 1982
    Published: Jan, 1984


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doi:10.2135/cropsci1984.0011183X002400010016x

Response of an F1 Interspecific Cotton Hybrid to Nitrogen Fertilization1

  1. Arturo Palomo and
  2. D. D. Davis2

Abstract

Abstract

Response of the high yielding interspecific cotton (Gossypium hirsutum L. × G. barbadense L.) hybrid, ‘NX-1’, to four N fertilizer levels (0, 55, 110, and 220 kg ha-1) and 2 years (1979 and 1980) was evaluated. ‘Acala 1517–75’ and ‘McNair 220#x2019;, G. hirsutum L. cultivars, were also included as checks. Data recorded included blooming rate, earliness, lint yield, boll characteristics, and fiber properties. NX-1 was about 9 days earlier to first bloom, compared to the checks, and exhibited a higher blooming rate. NX-1 also showed the largest increases in floral production with the addition of N in 1980, but not in 1979. The flower production of NX-1 was increased by the addition of 55 kg of N ha-1, but not by additions beyond that level. NX-1 was the earliest genotype as measured by the number of days from planting to first bloom, production rate index, and lint yield at first harvest. A significant genotype ✕ N interaction for lint yield was detected. At zero N level, the lint yield of the hybrid was significantly lower than with added N. McNair 220 and Acala 1517–75 did not show a significant response to N. On the average, lint yield of the hybrid was 38 and 27% higher than for Acala 1517–75 and McNair 220, respectively. NX-1 had a smaller boll, fewer seed boll-1, lower lint percentage, and a higher seed index, compared to the checks. The hybrid showed a fiber fineness similar to that of Acala 1517–75, but its fiber was longer and stronger with a higher elongation. Boll characteristics and fiber properties were not significantly influenced by N rates.

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