Die invloed van plantpopulasie op opbrengs en kwaliteit van katoen (<i>Gossypium hirsutum</i> L.) in die Vaalharts- en Sandvetbesproeiingsgebiede

Bruyn, L. P. de; Kock, J. de; Human, J. J.

doi:10.1080/02571862.1989.10634502

Cited by 1 publication

(1 citation statement)

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“…Photosynthesis by plants at high density is lower than its potential maximum due to mutual shading of leaves (15). Similar results were obtained by Bruyn et al (16).…”

Section: Resultssupporting

confidence: 87%

Effect of plant population densities and application of growth retardants on cottonseed yield and quality

Sawan

Basyony

McCuistion

et al. 1993

J Americ Oil Chem Soc

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In field trials at Giza in 1986-1987, cotton cv. Giza 75 was sown at 166,000, 222,000 and 333,000 plants/ha and given foliar applications of 0, 250, 500 and 750 ppm Cycocel {chlormequat) or Alar (daminozide}. As plant density increased, there was a decrease in cottonseed yield]ha, seed index, seed protein content, oil and protein yields/ha, oil refractive index, iodine value, unsaponifiable matter and unsaturated fatty acids {myristoleic, oleic and linoleic). In contrast, as plant density increased, there was an increase in oil acid value, saponification value and saturated fatty acids (caprylic, capric, lauric, tridecylic, myristic, palmitic and stearic). Application of Cycocel or Alar increased cottonseed yield/ha, seed index, seed protein content and oil and protein yield/ha, oil refractive index, iodine value, unsaponifiable matter and unsaturated fatty acids. However, there was a decrease in oil acid value and saponification value. There were no differences among application rates of either chemical on cottonseed yield/ha. The highest oil and protein yield/ha was observed with Cycocel applied at 750 ppm, followed by Aiar at 250 ppm. Applying Cycocel at 250 ppm gave the highest oil refractive index and unsaponifiable matter, and the lowest acid value. Application of Aiar at 250 ppm gave the highest oil iodine value and the lowest saponification value, and also at 250 or 500 ppm gave the highest oil unsaturated fatty acid composition. Interaction was positive between plant density, Cycocel and Aiar and affected cottonseed yield/ha. The 166,000 plants/ha and application of Cycocel at 750 and Aiar at 250 ppm are recommended for the improvement of cottonseed yield and quality.KEY WORDS: Cottonseed yield, growth retardants, oil fatty add composition, plant density, seed index, seed oil content, seed oil prope~ ties, seed protein content.

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“…Photosynthesis by plants at high density is lower than its potential maximum due to mutual shading of leaves (15). Similar results were obtained by Bruyn et al (16).…”

Section: Resultssupporting

confidence: 87%