No abstract

Land-use change through degrading natural vegetation for agricultural production adversely affects many of soil properties particularly organic carbon content of soils. The native shrub land and grassland of Gaziantep-Adiyaman plateau that is an important pistachio growing eco-region have been cleared to convert into pistachio orchard for the last 50 to 60 years. In this study, the effects of conversion of natural vegetation into agricultural uses on soil erodibility have been investigated. Soil samples were collected from surface of agricultural fields and adjacent natural vegetation areas, and samples were analyzed for some soil erodibility indices such as dispersion ratio (DR), erosion ratio (ER), structural stability index (SSI), Henin's instability index (I ), and aggregate size distribution after wet sieving (AggSD). According to the statistical evaluation, these two areas were found as different from each other in terms of erosion indices except for I index (P < 0.001 for DR and ER or P < 0.01 for SSI). In addition, native shrub land and converted land to agriculture were found different in terms of AggSD in all aggregate size groups. As a contrary to expectations, correlation tests showed that there were no any interaction between soil organic carbon and measured erodibility indices in two areas. In addition, significant relationships were determined between measured variables and soil textural fractions as statistical. These obtaining findings were attributed to changing of textural component distribution and initial aggregate size distribution results from land-use change in the study area. Study results were explained about hierarchical aggregate formation mechanism.

This study was carried out in order to determine the effect of organic mulch on the soil properties of wheat straw in wheat fields. Turkey's semi-arid climatic conditions in the Eastern Mediterranean Region. In the study, wheat straw in different proportions (0, 300 kg/da, 600 kg/da and 900 kg/da) was applied to the soil surface. The trial was set up with 3 replications according to the randomized blocks trial pattern under field conditions. After the wheat harvest, soil samples were taken from each parcel at a depth of 0-15 cm and analyzed in laboratory. As a result, it has been determined that wheat straw applications, increases the organic matter of the soil depending on the applications. In addition, wheat straw increased the liquid limit, plastic limit, available water content and field capacity of the soils. Depending on the application dose, liquid limit of the soil, plastic limit, available water content and field capacity increase were associated with organic matter. According to the results of statistical analysis, significant differences were found on organic matter, liquid limit, plastic limit, available water content and field Keywords:Wheat straw Soil water content Field capacity Semi arid conditions capacity (P<0,05). It has been concluded that the application of 600 kg/da and 900 kg/da wheat straw in Kahramanmaraş conditions will increase the organic matter in the soil, increase the water capacity suitable for the plant, decrease the surface flow, improve the porosity properties and provide water and air retention balance in the root zone, thus increasing the yield and quality in crop production.

Path coefficient analysis provides a much better understanding of the correlation coefficient values. Spad values give information about the state of the leaf. In the study, path coefficient analysis was performed, especially SPAD values in beans. The study was carried out Kahramanmaraş Sutcu Imam University, treatment area in 2021 year. Mispir cultivar and Aydintepe local common bean genotype were used, leonardite and chicken litter and their mixture were used, various doses (3,6,9 t ha-1 and conventional fertilizer (25 kg ha-1 N/64 kg ha-1 P2O5) and control application) were added to the soil. Leaf chlorophyll content was measured in three periods: early leaf (1st SPAD), flowering stage (2nd SPAD), post-flowering (3rd SPAD). In addition, seed yield and biomass yield values were determined. Chicken Manure 3 t ha-1 organic fertilizer application showed the best performance among all applications in terms of seed yield. And the Aydintepe local genotype showed higher performance than the Mispir cultivar for the most of the properties examined.

In this study, some physico-chemical properties of the agriculturally produced soils in Adana's Ceyhan plain were determined and their relations with each other were tried to be explained. For this purpose, a total of 46 soil samples were taken from the agricultural production areas in the Ceyhan plain. Field capacity, wilting point, available water, hydraulic conductivity and other routine analyzes of the soil samples taken were done in the laboratory. According to the results; The average pH of the soils (7.73) was slightly alkaline, the total lime (19.06%) was very calcareous, and the salt content (0.15%) was in the slightly salty class. The physical properties of the soils, average clay 37.13%, sand 36.65% and hydraulic conductivity were determined as 0.46 cmh-1. According to the results, it has been observed that the water permeability of the soils of the Ceyhan plain is very low due to the high clay content, and the Ceyhan plain soils were low saline class. In addition, although the field capacity of the studied soils was high, it was determined that the water content suitable for the plant was not high. This can be explained by the high clay content of the plain soils. Organic regulators (such as leonardite, cattle manure) can be applied to improve the light salt problem, water permeability and useful water content of the Ceyhan plain soils.