Legumes and nutrient management improve phosphorus and potassium balances in long-term crop rotations
Type de document
journalArticle
Langue source
-- Langue source --
Titre
Legumes and nutrient management improve phosphorus and potassium balances in long-term crop rotations
Titre français
Titre anglais
Auteur(s)
- WHITE Kathryn E.
- CAVIGELLI Michel A.
- BAGLEY Gwendolyn
Editeur(s)
Autre(s)
Id
P2JNYHL8
Version
3481
Date ajout
22 avril 2021 18:30
Date modification
22 avril 2021 18:30
Résumé
Balancing phosphorus (P) and potassium (K) inputs with crop needs is challenging in cropping systems applying poultry litter (PL) for nitrogen (N). We compared P and K balances of PL-amended organic and mineral-fertilized conventional systems over 13 years. In organic systems, lower legume cover crop biomass (3462±421 vs. 4691±436 kg ha−1) and N contributions in a corn (Zea mays L.)-soybean (Glycine max Merr.) rotation (Org2) led to 58% greater PL applications to corn than in a corn-soybean-wheat (Triticum aestivum L.) rotation (Org3); as did alfalfa in a corn-soybean-wheat-alfalfa (Medicago sativa L.) rotation (Org6). Greater Org2 and Org3 P inputs reduced harvest exports by 106 and 102 kg ha−1, respectively, increased mean P balances by 209 kg ha−1, and mean Mehlich 3 P concentrations by 9.6 mg kg−1 compared to Org 6. Alfalfa exported 62% of P and 56% of K applied throughout the Org6 rotation. Due to alfalfa export, the annual P surplus was small (9 kg ha−1) and soil P was ‘optimum’ in Org6. Soil test-based fertilizer application in tilled and no-till conventional systems with initially high soil P led to a -124 kg ha−1 P balance and ‘optimum’ soil P. Fertilizer and PL K applications exceeding crop uptake led to positive K balances in all systems but greater retention of PL than fertilizer K. Legume cover crops or forages and increasing crop rotation length/complexity improved organic system P and K balances. Soil test-based fertilizer application in conventional systems reduced high soil test P while maintaining yields. This article is protected by copyright. All rights reserved
Note
None
CRAW tags
- AB - Modalité bio
- FREDO fertilisation
- GEO Etats-Unis
- légumineuses
WEB tags
Titre de la publication
Agronomy Journal
Volume
n/a
Date caractères
03/2021
Date publication
1 mars 2021
Doi
https://doi.org/10.1002/agj2.20651
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Issn
1435-0645
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