INFLUENCE OF NITROGEN-FERTILIZATION AND FOLIAR APPLICATION OF PLANT-GROWTH RETARDANTS AND ZINC ON QUANTITATIVE AND QUALITATIVE PROPERTIES OF EGYPTIAN COTTON (GOSSYPIUM-BARBADENSE L VAR GIZA-75)
Zm. Sawan et al., INFLUENCE OF NITROGEN-FERTILIZATION AND FOLIAR APPLICATION OF PLANT-GROWTH RETARDANTS AND ZINC ON QUANTITATIVE AND QUALITATIVE PROPERTIES OF EGYPTIAN COTTON (GOSSYPIUM-BARBADENSE L VAR GIZA-75), Journal of agricultural and food chemistry, 45(8), 1997, pp. 3331-3336
Field experiments, in two successive seasons, at the Agricultural Rese
arch Center, Giza, Egypt, determined the effect of N fertilization (ad
dition at rates of 107 or 161 kg of N/ha) and foliar application of pl
ant growth retardants (Pix, Cycocel, or Alar, each applied once at 300
ppm, 75 days after planting) and zinc (applied at 0.0 or 50 ppm, two
times: 80 and 95 days after planting) on growth, mineral uptake, yield
components, yield, and fiber properties of Egyptian cotton cultivar G
iza 75. Dry matter yield, N and Zn uptake per plant, number of opened
bolls per plant, boll weight, seed index, lint index, seed cotton yiel
d per plant, and seed cotton and lint yield per hectare increased with
increasing N rate and by foliar application of plant growth retardant
s (with best results when Pix was applied) and zinc. The earliness of
harvest increased by the application of Zn in season I and Pix in seas
on II only. Treatments generally had no effect on lint percentage and
fiber properties, except in season II when Pix and Cycocel were applie
d, the 2.5% span length tended to increase over the control.