Tawfeek Alnokary1*

1 Homs Research Center, General Commission for Agricultural Scientific Research, Syria.
(*Corresponding author: Tawfeek Alnokary, Email:twfekalnkary@gmail.com, Mobile: 0937259745).

Received: 27/10 / 2025       Accepted: 15/01/ 2026

Abstract: 

A field experiment was conducted in the Damascus countryside, Kafrin village, using four levels (0-15-30-45) tons/ha of each of the following: cities waste compost, olive pomace, sewage sludge, and cow manure. during the 2017 and 2018 growing seasons. the soil was planted with Zea Maize, salamiya-1, on (May 22/2017 and May 27/2018) , and the grains were harvested on (September 8/ 2017, and September 24/ 2018)  in the both  the first and second seasons, respectively. This was done to determine the effect of adding different levels of several types of organic fertilizers on Content Of Zea Maize of the oil, starch, and protein. The results showed that increasing the levels of organic fertilizers used in soil fertilization led to gradual increase in the oil, starch, and protein content of the corn Kernels, with significant difference appearing between most treatments. most treatments showed a significant advantage in the oil, starch, and protein content of the corn Kernels in both seasons of the study compared to the control (except for the oil content in the first season). The oil content reached 4,73% in the second season when the third level of cities waste compost was added compared to 4.11% in the control. Similarly, the starch and protein content reached 65.21% and 10.97%, respectively, in the second season after the addition of the third level of sewage sludge, compared to 61.02% and 8.97% respectively, in the control.  All treatment in the second season significantly outperformed the corresponding treatments in the first season.

Keywords: cities waste compost, Sewage sludge, Olive pomace , Oil, Strach, Protein.

 Full paper in Arabic: PDF