Cottonseed, protein and oil yields and oil properties as affected by nitrogen and phosphorus fertilization and growth regulators

Abstract

Two experiments were carried out at our research center during the 1981 and 1982 seasons on cotton cultivar Giza 75 (Gossypium barbadense L.) to investigate the influence of nitrogen fertilization rates (72, 144 or 216 kg/ha.), phosphorus levels (36 or 72 kg P2O5/ha.) and three growth regulators (IAA, IBA or NAA) applied to cotton plants at 10 ppm and sprayed three times (70, 85 and 100 days after sowing) on protein and oil yields, and oil properties. A randomized complete block design with four replications treatment combinations was used. The combined analysis of the results of the two seasons revealed that yields of cottonseed, oil and protein increased by raising nitrogen and phosphorus levels and under the application of growth regulators. Seed index increased by raising the added nitrogen and the applied growth regulants. No detectable effect of phosphorus levels was observed. The seed oil percentage decreased, although the protein percentage increased, when the nitrogen application rate was raised. Application of growth regulators and a high phosphorus level increased the seed oil percentage, but the seed protein percentage was not affected. The seed oil properties, i.e., acidity, saponification and iodine values, tended to decrease slightly by increasing the nitrogen application rate and the application of growth substances, but the trend reversed when the phosphorus level was raised. The mean values of oil specific gravity and refractive index did not show any definite responses.

Effect of 1‐naphthaleneacetic acid on the seed, protein, oil, and fatty acids of egyptian cotton

“…Seed protein (%) and yield. NAA treatments tended to show a slight seed protein percentage increase ITable 1) which was similar to the results obtained by Sawan et a£ EFFECT OF 1-NAPHTHALENEACETIC ACID ON EGYtYrIAN COOl'ON (3,4). The seed protein yield (kg/ha) was markedly increased because of NAA applications as compared to the control The highest proteinyield was detected at 20 ppm, followed by the 15 ppm level.…”

“…The n u m b e r of applications three times, twice, and once was positively effective in the same order. This was in harmony with the results obtained by S a w a n e t cd, (3,4).…”

“…The effects of PGR 1-naphthaleneacetic acid (NAA) on seed cotton yield and fiber quality have been widely studied, but few studies documented their effects on the quantity and quality of seed yield. Using NAA on cotton plants produced increases in cottonseed yield, seed index, and seed oil content, while seed protein was unchanged (3)(4)(5). Brar and Mukand (6) have reported that two sprays ofNAA increased seed indexmore than only one spray.…”

Identification of QTL and QEI for Fiber-related Traits in Gossypium Hirsutum L. 

“…In recent years, a lot of QTL for yield, ber quality and other agronomic traits have been identi ed with SNP marker genetic maps in cotton, including restriction-site associated DNA sequencing (RAD-seq) [11,12], genotyping-by-sequencing (GBS) [13,14], ampli ed fragment sequencing (SLAF-seq) [15][16][17][18], and SNP-array [19]. In addition to ber, cotton is also regarded as the most important source of vegetable protein and oil [20,21]. Previous study has demonstrated that the negative relationship exists between cottonseed oil content and ber yield [22], and cottonseed oil content is also negatively related to seed protein content [23][24][25].…”

Review: Nitrogen Utilization Features in Cotton Crop

“…Nelson (1949) [53] and Sawan et al (1988) [54] showed that cotton yield and cottonseed N concentration increased linearly with increasing N fertilizer rates. Saleem et al (2010) [43] showed that the maximum seed cotton yield per plant, and seed cotton yield kg/ha were (69.3 g, 3002.4 kg) respectively recorded when nitrogen was applied at the rate of 120 kg•ha [28] found that application of 225 kg•ha −1 nitrogen fertilizer produced the maximum yield (1731.06 kg), the highest number of bolls per plant (5.61), while the maximum boll weight observed in 150 kg•N•ha −1 (9.18 g).…”