Suscetibilidade magnética na caracterização da variabilidade espacial de atributos do solo em solos subtropicais

Magnetic susceptibility (MS) has been used to estimate soil attributes. With the proposal to increase the information of soils in southern Brazil the objectives of this work were: (i) evaluate the correlation of SM with soil attributes in a slope of subtropical basaltic soils; (ii) to characterize the spatial variation structure of MS and the content of sand, clay and COS; and (iii) identify the sample density that captures the spatial variability to assist future work under similar conditions. In a 22 ha area located in Santo Augusto - RS, Brazil, an 87 points sample grid was collected to determine soil attributes. Samples were also collected in five profiles along the slope. The profile data were analyzed by correlation to verify the degree of Pearson correlation of the SM with the attributes of the soil. In the sample grid spatial dependence analyzes were performed to assess the degree of spatial dependence on soil attributes. The MS presented a high correlation with the attributes of clay soil, Fes, Fed and COS. The evaluation of the spatial variation structure showed that the attributes presented a degree of spatial dependence ranging from weak for COS to strong for MS. The spatial variability pattern suggests a sample density of one point every 4 to 12 ha.

Farklı Ana Materyaller Üzerinde Oluşmuş Topraklarda Gidya ve Azot Uygulamalarının Kırmızı Biber (Capsicum annum L.) Bitkisi Gelişimine Etkisi

This study was carried out to determine the effects of gyttja (0, 1, 2, and 4%) and nitrogen (0,70, 140, and 210 mg kg-1) applications on the growth and nutrient uptake of red pepper plants grown in the soils formed on the different parent materials (basalt, serpantine and limestone) which had been taken from the East Mediterranean Agricultural Basin. The findings showed that plant biomass significantly increased, but fruit yield was not affected with gyttja applications. On the other side, nitrogen applications at 140 mg kg-1 and 210 mg kg-1 doses significantly increased biomass and fruit weights. Among the soils formed on different parent materials, in case of plant morphological variations plant heights and biomass weights were highest in the basaltic soils while the highest fruit weight was measured for serpantine soils, and the highest harvested number of fruits were measured for limestone soils.