Data/hora: 11/06/2024 07:50:50

Provedor de dados: | 64
País: | Brazil
Título: | Spatial variability of soil acidity attributes and the spatialization of liming requirement for corn
Autores: | Hurtado,Sandro Manuel Carmelino; Silva,Carlos Alberto; Resende,Álvaro Vilela de; Von Pinho,Renzo Garcia; Inácio,Euzelina dos Santos Borges; Higashikawa,Fábio Satoshi.
Data: | 2009-10-01
Ano: | 2009
Palavras-chave: | Precision agriculture; Geostatistics; Zea mays (L); Liming application zones.
Resumo: | In Brazil, technicians, in most cases, ignore the aspects related to the spatial variability of the soil acidity attributes when liming requirement is calculated. The objective of this study was to validate the liming practice, evaluating the presence of spatial variability of the soil acidity attributes and the existence of areas with differentiated liming requirement, which were calculated by different methods. The experiment was carried out in an area cultivated with corn under conventional management and irrigation. The soil (0-0.2 m) was sampled in a conventional way (composite soil sample) and in a systematic scheme, by use of a grid sampling. In sequence to the soil fertility attributes analysis, it was calculated the liming requirement, according to the methods of SMP pH, aluminum neutralization and elevation of soil Ca and Mg levels, and increase of the soil base saturation. After the descriptive analysis of the data set was accomplished, the semivariograms were calculated and the maps were obtained through the kriging technique. Absence of spatial dependence, as well as the non necessity of limestone application, was observed for the Al neutralization calculation method. Spatial dependence was only verified for the soil acidity attributes and to the liming requirement calculated by the base saturation and SMP pH methods; for these two methods, the semivariogram ranges obtained varied from 35.7 to 200.5 m. The results have highlighted the existence of differentiated liming requirement zones when the variability of the soil acidity attributes was considered in the calculation of the dose and type of limestone to be used for corn soil acidity correction.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000500022
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542009000500022
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.33 n.5 2009
Fonte: | info:eu-repo/semantics/openAccess