Nitrogen Budget in a Pineapple Crop Growing in the Orinoco Lowlands

摘要: Abstract Field measurements showed the nitrogen (N) inputs and output of a fertilized pineapple crop [Ananas comosus (L.) Merr. c.v. Red Spanish] growing in Orinoco llanos during consecutive seasonal courses. The process rate changed with growth life‐cycle stages conditions. N accumulated by over period was 226 kg N ha−1. It depended on available soil timing split application fertilizer. Detailed monitoring plant N‐accumulation maximum (3.20 kg N ha−1 d−1) at harvesting time. N‐harvested ratio N‐use efficiency were 0.27 138 g g−1, respectively. calculated N‐mineralization 167 kg N ha−1 life cycle. fate fertilizer applied to determined microplots using urea labelled 9.634% atom excess 15N. Fertilizer recovery accounted for 48% corresponding fractions 15N recovered 0.16 0.0‐ 0.3‐...