This study was conducted during year 2025-2026 to determine the reasons for the failure of green lawns in the gardens of the College of Agriculture. Green lawns are considered the main plant element in the garden, where they are a source of its beauty in addition to their climatic importance. In addition to the theoretical study, the study included a systematic field study of some of the college's gardens, particularly those near the Horticulture and Landscape Engineering Department. Soil samples were taken from various locations to the right and left of the Horticulture Department, dried, and sifted. The required quantity was then weighed and extracted for analysis. Soil texture was tested, ranging from sandy loam at locations L1, R1, and R2, while the texture at location L2 was silty loam. Soil pH values ranged from 7.38 to 7.85, with the highest value in the sample at location R2 and the lowest in the sample at location L2. Electrical conductivity values ranged from 6.44 to 8.04 dS.m⁻¹ at both locations R1 and R2, with the highest value in the sample at location R1 and the lowest in the sample at location R2. Electrical conductivity values ranged from 5.85 to 6.35 dS.m⁻¹ at both locations. (L1, L2) The highest value was found in the sample at location L2, and the lowest value in the sample at location L1.
The variation in soil separation ratios is attributed to the different locations from which the soil was transported during the establishment of the gardens. The variation in salinity values and their elevation could be due to differences in water movement. The lower salinity values may be attributed to the fact that the gardens and green lawns are irrigated with more water than their field capacity allows, resulting in increased leaching of salts that could otherwise accumulate in the soil.
The results indicate that the water used for irrigation is safe for various uses, with a pH of 1.260 dS.m⁻¹. A decrease in the sodium adsorption ratio (SAR), a decrease in salinity, and low concentrations of positive and negative ions were also observed, confirming its suitability for irrigation in this type of facility. The study recommended excavating the soil to a depth of more than 30 cm and then adding a layer of river loam soil at least 50 cm thick to make it suitable for cultivation at all study locations. In the event of increased soil salinity in the future, irrigation water exceeding the field capacity can be used at intervals, as the light soil texture facilitates the vertical movement of salts, thus removing them periodically if they accumulate.