Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Effects of Sulfur and Ammonium Sulfate Applications with Different

Dosages on Some Chemical Properties of Soil ın Forest Nurseries

After different dosages of powder sulfur and ammonium sulfate applications on soils in Çankırı Kenbağ Forest Nursery, changes in chemical soil properties such as pH, electrical conductivity, lime, organic carbon and total nitrogen were examined.

Two different trials were constituted in the study. Each trial includes 3 different dosages of powder sulfur, 3 different dosages of ammonium sulfate and control applications, with 3 repetitions. In the first trial, 50, 75 and 100 g/m² dosages of powder sulfur; 10, 25 and 50 g/m² dosages of ammonium sulfate, while in the second trial, 200, 300 and 400 g/m² dosages of powder sulfur; 100, 150 and 200 g/m² dosages of ammonium sulfate were given to the soil. Repetitive samplings were carried out by taking soil samples for one time before the application of the dosages and through the depth of 0-20 cm on 10th, 20th, 30th, 45th, 60th, 90th, 120th and 150th days after the application.
With reference to the comparisons made according to the end of sampling and the beginning; decreases reaching 0,4-0,6 units in soil pH with powder sulfur application while decreases reaching 0,3-0,5 units in pH with ammonium sulfate application occurred in the first and second trial fields. It was observed that the maximum decrease was 0,6 units in sulfur 75 g/m2 application. It was concluded that powder sulfur is more effective than ammonium sulfate in reducing soil pH.
In general, the results of the electrical conductivity of soil changed between 100 µS/cm and 498 µS/cm in the first trial field, and between 118 µS/cm and 1365 µS/cm in the second trial field. Including the control application, electrical conductivity in other powder sulfur and ammonium sulfate applications increased in general in comparison with its first rate. It was observed that the lime rates in soil decreased in general until 150th day and then increased and approximated to its first rates on 0th day in both trial fields.
Nitrogen rates of soil don’t show an apparent tendency and change in general in both trials. Similarly to the nitrogen, it was observed that organic carbon rates of the soil also showed different increases and decreases from 0th day to 150th day in both trial fields.

When the findings obtained as a result of the search are evaluated; 75-100 g/m² dosage of sulfur may be recommended to regulate the soil reaction in Çankırı Kenbağ Forest Nursery.