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Response of an F₁ Interspecific Cotton Hybrid to Nitrogen Fertilization¹

Response of the high yielding interspecific cotton (Gossypium hirsutum L. x 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 x 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.

Key Words: Heterosis • Hybrid vigor • Lint yield • Earliness • Boll characteristics • Fiber properties • Blooming rate • Gossypium hirsutum L. x G. barbadense L.

² Former graduate student and professor, respectively, Dep. of Crop and Soil Sciences, New Mexico State Univ., Las Cruces, NM 88003.

Received for publication November 8, 1982.