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Title: Differential vineyard fertilizer management based on nutrient’s spatio-temporal variability
Authors: Serrano, João
Marques da Silva, J.
Shahidian, Shakib
Silva, L. L.
Sousa, A.
Baptista, F.
Keywords: Fertilizer management
spatial variability
plant nutrition
apparent soil electrical conductivity
Issue Date: Jan-2017
Publisher: Journal of Soil Science and Plant Nutrition
Citation: Serrano, J., Shahidian, S., Marques da Silva, J., Shahidian, S., Silva, L. L., Sousa, A., Baptista, F. (2017). DIFFERENTIAL VINEYARD FERTILIZER MANAGEMENT BASED ON NUTRIENT’S SPATIO-TEMPORAL VARIABILITY. Journal of Soil Science and Plant Nutrition, 17(1): 46-61.
Abstract: Conventionally, vineyard fertilizer management has been based on information from composite soil samples and no account has been taken of the existing spatial variability in soil fertility. This study presents a quantitative analysis of soil phosphorus (P2O5) and potassium (K2O) content as well as pH carried out in an 80 ha vineyard, during 2011 and 2013 in order to identify their spatial variability and temporal stability. Additionally a quantitative analysis of plant P2O5 and K2O content was carried out in 2013 with the objective of evaluating the spatial variability of plant nutrients. In 2013 a contact sensor was used to survey soil apparent electrical conductivity (ECa) and an active optical sensor was used to measure the plant Normalized Difference Vegetation Index (NDVI). The results showed a low potential for implementing site-specific management of phosphorus fertilizer but an interesting potential for implementing site-specific management of potassium fertilizer and pH correction. The concentration of P2O5 and K2O in the plant showed a CV<30%, with adequate values in almost the entire area of the field, in contrast to the concentration of these main macronutrients in the topsoil. These results show that for differential nutrient management of vineyards, plant nutrient concentration is a more stable tool than soil nutrients concentration. The ECa and the NDVI presented weak correlations with soil and plant concentration of, , respectively, P2O5 and K2O, which shows that further development of vegetation operational sensors is needed to support decision making in the vineyard fertilization management.
ISSN: 0718-9516
Type: article
Appears in Collections:ERU - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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