Resumo

PERALTA, Nahuel Raúl et al. Precision agriculture: variable phosphorus rate in soybean (Glycine max (L.) Merrill.). Cienc. suelo [online]. 2021, vol.39, n.1, pp.112-126. ISSN 1850-2067.

Precision agriculture (AP) allows differentiating management sites (ZM) that express contrasting grain yield potential. The aims of this study were to: i) evaluate the interaction between ZM and phosphorus (P) fertilization over soybean yield, and ii) quantify the P use efficiency (EUP) in the different ZM. The experience was carried out in two agricultural fields (Site 4 and Site 6) from Benito Juárez. (37°26'53, 23"S; 59°35'45,28"O). The ZM were delimited based on the land elevation, topographic index (TWI) and soil depth. The extractable P content (P-Bray) was determined at each ZM after soil sampling. At each ZM, trials with a randomized complete block design (four replications) were performed to evaluate five different P rates (0, 10, 15, 20, 25 kg P ha-1). No interaction between ZM and P fertilization over grain yield was observed. However, the EUP was affected by ZM. The greatest EUP was observed in zones with medium or high productive potential with lower values of P-Bray in the soil.

Palavras-chave : Management zones; soil depth; spatial variability; Southeastern Buenos Aires.

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