Phosphorus Fractions in Soil with Organic and Mineral Fertilization in Integrated Crop-Livestock System

Amanda Zolet Rigo,Gizelle Bedendo,Marco André Grohskopf,Paulo Hentz,Juliano Corulli Corrêa,Álvaro Luiz Mafra,Luciano Colpo Gatiboni

doi:10.1590/18069657rbcs20180130

Abstract

ABSTRACT Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroferrico) in a randomized block design, using a 5 × 3 + 1 factorial scheme, with four replicates. The treatments consisted of three organic fertilizers (poultry litter, pig slurry, and compost) [...]

Highlights

To meet the high demand for food production in Brazil, crops must be fertilized with phosphorus, since more than 80 % of Brazilian soils are poor in this nutrient
One noteworthy alternative is reuse of P from livestock residues associated with conservationist systems, such as the integrated crop-livestock system, which can further enhance the efficiency of P availability in the soil (Crusciol et al, 2015; Andrade et al, 2017; Prochnow et al, 2018)
The ratio of the P content extracted through resin from the poultry litter and slurry fertilizers was higher than 2:1, which are similar to their peers with mineral fertilizers M1/thicken manure and M2/pig slurry (Table 3)

Summary

Introduction

To meet the high demand for food production in Brazil, crops must be fertilized with phosphorus, since more than 80 % of Brazilian soils are poor in this nutrient. Effective use of organic fertilizers in an iCL system may result in positive economic and environmental effects because of the greater diversity of the integrated system, which may favor nutrient cycling and availability (Anghinoni et al, 2011; Hentz et al, 2016). In the state of Santa Catarina, the nutrient limits foreseen in environmental legislation must be observed. This legislation establishes the maximum amount of P to be applied (Fatma, 2016)

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