Login

Proceedings

Find matching any: Reset
Add filter to result:
Spatial And Vertical Distribution Of Soil P, K, And Mg Content In A Vineyard Of The Do Ca Rioja Using Grid And Target Sampling Methods
1O. Unamunzaga, 2A. Castell, 2G. Besga, 2R. Perez-Parmo, 2A. Aizpurua
1. Universidad de Zaragoza/Bodegas y Vi
2. NEIKER

 

Knowledge of spatial variability of soil nutrient contents is very important to design a fertilization strategy based on the needs of the vine. Matching fertilization and nutritional plant needs is very important due to the influence of nutritional status of vineyards on productive and qualitative factors. The aim of this work was to study the spatial and vertical variability of P, K and Mg in a vineyard soil by two methods: (i) the grid sampling at three depth ranges (0-30, 30-60 and 60-90cm ), and (ii) the target sampling based on the previous zoning of the parcel and the subsequent description and analysis of soil profiles. The study was conducted in a vineyard of 8 hectares, located in the town of Oyon (Northern Spain) in the Denominación de Origen Calificada Rioja. Although the surface soil P content was high (29 mg kg-1) decreased to less than 6 mg kg-1 at 20-45 cm depth. As for K, the soil content at 0 to 30 cm depth was 159 mg kg-1 and decreased to values less than 66 mg kg-1at 40 to 85 cm depth. However, the soil Mg content did not change with the depth (1.1-1.2 cmol kg-1). Soil P content had the highest coefficients of variation in the depth of 30 to 60 cm (267%). Previous fertilization practices influenced the spatial distribution of P and K from 0 to 30 cm, while at 30 to 60 cm the effect of erosion was also observed. On the other hand, geological parent material had a great influence on soil Mg spatial distribution. By the grid sampling we were able to establish several areas according to the spatial distribution of the soil P and K contents, which can be specifically managed for fertilizer application. However, the target sampling was more adequate to evaluate the spatial variability of soil Mg content.
Keyword: soil nutrients, soil variability
O. Unamunzaga    A. Castell    G. Besga    R. Perez-parmo    A. Aizpurua    Precision Nutrient Management    Oral    2010
Download paper