Change in cotton plant quality in response to application of anaerobically digested sewage sludge

Abstract

Treated municipal sewage sludge (TSS) was applied to the cotton plant at rates of 10, 20 and 30 t/ha per year. Seed cotton yield (71.4%), lint yield (67.7%) and cottonseed yield (74.1%) were increased significantly when sludge was applied at a rate of 30 t/ha (TSS3). The effects of TSS applications on seed yield, lint yield and cottonseed yield were listed as TSS3 > TSS2 > CF > TSS1 > C according to the applications. The increasing TSS levels had a positive effect and increased the total N concentration compared to the control. The highest N value was observed in TSS3 plots, while the lowest value was recorded in control (C) plots. The highest P value was found in control (C) at 0.80% and in 10 t/ha (TSS1) at 0.80%, while the lowest value was found in the TSS2 application (0.70%). The K concentration of cottonseed increased with the increasing TSS rates, from 1.56% in control plots to 2.20% in 20 t/ha application (TSS2). Corresponding to the TSS levels, the calcium of plant tissues was determined by a range of 0.12–0.13%. The treatments of TSS and mineral fertilizer had similar effects on the Mg content of cottonseed, which was in the range of 0.38–0.43%. Na content in plant tissue increased with increasing dose of sludge application compared to control soils. Increasing doses of TSS had no significant effect on the concentrations of iron (Fe), copper (Cu), zinc (Zn), manganese (Mn) and boron (B) in cottonseed. The order of the elements with respect to their amounts in cottonseed was as follows: Fe > Zn > Na > B > Mn > Cu. The concentrations of non-essential elements (Ni, Cd, Cr, Pb, Hg and As) in cottonseed were below the permissible limits.

Biosolid Mixtures Applied in Tropical Soils and Their Effect on Coriandrum sativum and Ocimum basilicum Nutritional Uptake

“…This agrees the hypothesis that biosolids as sludge have a positive impact on promoting the K uptake. Tepecik et al [30] grow cotton plants in sewage sludge-amended soils from Turkey (20 t/ha). Authors emphasized the capacity of biosolids to enhance the K uptake due to the positive interactions between K ions and organic matter present in the sludge.…”

“…Biosolid-amended soils exhibit a notable Fe uptake in basil leaves, especially in voladora soil mixtures. Previous research Tepecik et al [30] reported that increasing the organic matter in biosolids enhances Fe chelation, making it more accessible for plant uptake, as it is incorporated with other organic compounds. Basil cultivated in voladora soil mixtures (Figure 10) contain a greater amount of Mn than plants cultivated in the coloso soil (Figure 9).…”

“…This suggests that the availability of these nutrients was less affected by soil chemical differences (Fe in the coloso soil-49.12 ± 6.41 mg/g and the voladora soil-54.09 ± 7.75 mg/g). Tepecik et al [30] reported linear increases in cottonseed Fe, Zn, Mn, and B, with higher sewage sludge application rates up to 30 tons/ha. Similarly, Yang et al [36] found a significant increase in the Zn and Cu content in wheat and maize grains with sludge amendments' application over 10 years.…”

Pamuk Çeki̇rdeği̇ Protei̇n Konsantresi̇ni̇n Karakteri̇sti̇k Özelli̇kleri̇ni̇n Beli̇rlenmesi̇

“…The cottonseeds contain approximately 18-25% oil, and 20-25% protein (Saxena et al, 2011). In this context, cottonseeds gain importance because of their nutritional value and different value-added product groups for the economy/society could be produced by using them (Wei et al, 2017;Tepecik et al, 2022). They have been widely evaluated as raw material in the oil industry.…”