Response of Giza 88 cotton cultivar to foliar spraying with boron, potassium or a bioregulator SGA-1 [electronic resource].

Includes references.

Two field experiments were carried out at Bassyoun centre , Gharbia Governorate during the two successive seasons 2003 and 2004. These experiments were conducted to evaluate the effect of two foliar sprays of boric acid at two levels Le. 0.15 and 0.3% at each spray,K₂SO₄ at two levels Le. 1 and 2% K₂O at each spray and a bioregulator SGA-1 at two levels Le. 0.2 and 0.4% at each spray in comparison with spraying water as a control. The leaf nutrients content, growth traits, boll set attributes, earliness, seed cotton yield and its components of the Egyptian extra long staple ( Gossypium barbadense L.)Giza 88 cotton cultivarwere measured. The leaf Nand P contents were significantly increased due to the different spraying treatments where these contents reached their highest averages due to the loliar application of SGA-1 followed by the high level of boron. The same treatments recorded a high K and Ca contents and the highest Fe, Mn and Zn contents. Foliar application of SGA-1 was effective to enhance cotton plant growth as expressed in taller plants and larger number of sympodia and hence larger number of bolls/plant than the control ones. These improvements were reflected in seed cotton yield/fed. Foliar application of boric acid at a level of 0.3% or potassium sulphate at a level of 2% K₂O was also effective in these respects but with lower averages than those obtained due to the SGA-1 treatment. The results concluded that two foliar sprays with a bioregulator SGA·1 at a level of 0.4% at the beginning of flowering and 15 days later is the best treatment for good growth and high productivity of the extra long staple , Giza 88 cotton cultivar. Also, two foliar feedings with boron as boric acid at a level of 0.3% or potassium as potassium sulphate at a level of 2% K₂O could be used for high productivity

Summary in Arabic.

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