Nitrogen, phosphorus, and potassium released by decomposition of palisade grass to soybean in succession

Abstract: The objective of this work was to determine the nitrogen, phosphorus, and potassium released by N-fertilized Urochloa brizantha straw, desiccated before sowing of no-tillage soybean (Glycine max) in succession. The pasture was grown in three paddocks, each fertilized with one N rate (0, 150, or 300 kg ha-1), and assessed at two desiccation periods (60 or 15 days before soybean sowing), in four replicates. Nitrogen fertilization of U. brizantha pasture increases N and K cycling and the release of these nutrients to the subsequent soybean crop. The quantity of K released by U. brizantha straw fertilized with 150 or 300 kg ha-1 N (about 80 kg ha-1 K) offsets that contained in an export of up to 4 Mg ha-1 soybean grains, assuming zero K losses in the system. An early desiccation of the U. brizantha pasture does not improve K uptake by the soybean crop, since 50% of the nutrient is released in the first 20 days after desiccation. The dynamics of P release from U. brizantha straw (about 6 to 10 kg ha-1 during the soybean crop) is not influenced by N fertilization and the time of pasture desiccation.

Bibliographic Details

Main Authors:	Werner,Flávia, Ferreira,André Sampaio, Balbinot Junior,Alvadi Antonio, Oliveira Junior,Adilson de, Franchini,Julio Cezar, Debiasi,Henrique, Silva,Marcelo Augusto de Aguiar e
Format:	Digital revista
Language:	English
Published:	Embrapa Secretaria de Pesquisa e Desenvolvimento 2020
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2020000102612
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