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Article Info Received : 15.07.2014 Accepted : 21.11.2014 Effects of farmyard manure treatments on some soil structural parameters such as, aggregate stability (AS), geometric mean weight (GMWD) and mean weight (MWD) diameters, fragmentation (D) and mass (Dm) fractal dimensions, bulk density (BD) and organic C (OC) contents of aggregates were determined in a clay soil. Application of 67 Mg ha -1 farmyard manure to Vertic Haplustoll soil decreased AS 12.14% compared with the control. Manure treatment increased the proportion of microaggregates in the fractions <1.00 mm in size and decreased the proportion of macroaggregates in the fractions >1.00 mm in size. While OC contents of aggregates increased between 22.8% and 123.4%, BD values decreased between 0.8% and 16.6% with the manure treatment. Fragmentation (D) and mass (Dm) fractal dimensions were increased with decreasing numbers of macroaggregates of the clay soil. GMWD (1.16 mm) and MWD (1.86 mm) obtained in the manure treatment were lower than that in the control treatment (1.20 mm and 1.95 mm, respectively). Although OC content of the aggregates increased with the manure treatment, the number of macroaggregates of clay soil decreased with decreasing AS..

The aim of this research was to determine some erodibility factors, aggregate stability, structure stability and crust formation, in soils located at Ilgaz National Park and to generate their spatial distribution maps using fifteen different interpolation models in GIS medium. For this aim, total 151 soil samples were collected from surface (0-20 cm) soil depth. According to analysis results, it was determined that most part of the investigated soils has high erodibility value. In addition, correlation analysis was performed between erodibility factors and some soil physical and chemical properties. According to analysis results, it was found that a significantly positive relationship was found between AS and EC (0.460**) and OM (0.603**) at the 1% importance level whereas, a negative relationship was found between BD (-0.544**) at the 1% importance level. A positive relationship was also found between SSI values and EC (0.418**) and OM (0.565**) at a 1% significance level, and a negative relationship was found at a 1% significance level with BD (-0.542**). Moreover, a positive relationship was found between CF and EC (0.523**), OM (0.894**) and sand (0.345**) at a 1% importance level, and a negative relationship was found at a 1% importance level with clay (-0.376**) and BD (-0.811**).

The present study was carried out to investigate the effects of two different ratios of Fe-EDDHA chelated fertilizers, (F1:4.8% and F2:6%) having the same amount of 6% soluble Fe content, on dry matter production and Fe uptake of tomato seedlings at different growth periods and Fe forms of a calcareous soil. The experiment was conducted in a factorial experimental design using Fe-EDDHA chelated fertilizers and the plant growth periods (10, 20, 30 and 40 days after seedling) with three replicates under the greenhouse conditions. The results indicated that the dry matter content, Fe uptake, chlorophyll-a, chlorophyll-b, total chlorophyll and carotenoid contents in plants generally increased over the control with increasing the growth periods. The plant dry matter contents were higher in F1 than F2 fertilization. The plant Fe uptakes in F1 treatment during the growth periods were also higher than that in F2 treatment. The carotenoid content and the chlorophyll formations in terms of both chlorophyll-a, chlorophyll-b were higher in F2 fertilization at the 20th day and higher in F1 fertilization at the 40th day. The DTPA-Fe and exchangeable-Fe contents in soil samples generally decreased while the organically bounded-Fe content in soil samples increased with increasing growth periods. It can be suggested that 4,8% of Fe-EDDHA fertilizer is more effective on Fe uptake when compared with 6% of Fe-EDDHA chelated Fe fertilizer. Therefore, F1 fertilizer can be used when chlorosis is seen on plants in calcareous soils. On the other hand, F2 fertilizer can be used if long-term Fe fertilization is desired. The differences in effectiveness between Fe-EDDHA chelated fertilizers having the same amount of water-soluble Fe content may be occurred due to differences in their chelating formulas.

This study was carried out to determine the effects of different growing media (peat + perlite, cocopeat, hazelnut husk, rock wool) and different humic acid doses (2, 4, and 8 ml L-1) on tomato plant growth. The performance of the seedlings from planting to fruit set was evaluated to determine the growth of the tomato plant. Fort his purpose; stem diameter (mm), plant height (cm), number of leaves, first flowering and first fruit set, total plant dry weight (g), root volume (m3), and relative growth rate (g cm-2 days-1) parameters were examined. According to the results, the highest stem diameter of 15 mm was obtained in the hazelnut husk media at a dose of 4 ml L-1 of humic acid. As a result, while the best root growth was obtained at 2ml L-1 humic acid doses in peat-perlite media, the fastest growth and N (3.33%), P (0.58%) and K (3.91%) content were obtained at 8 ml L-1 humic acid doses in cocopeat media. The best leafing, flowering and fruit set were obtained in cocopeat media with 2 ml L-1 humic acid doses. As a result, the highest relative growth rate (0.064 g cm-2 days-1) at 8 ml L-1 humic acid doses applied in the fastest growing cocopeat media.