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- Title
Crop Yields and Soil Phosphorus Lability under Soluble and Humic-Complexed Phosphate Fertilizers.
- Authors
Bejarano Herrera, Wilfrand Ferney; Rodrigues, Marcos; Bettoni Teles, Ana Paula; Barth, Gabriel; Pavinato, Paulo Sergio
- Abstract
Phosphorus is one of the most limiting nutrients for plants in weathered tropical soils. To overcome this constraint, the use of humic-complexed phosphate fertilizer may be considered as one alternative, which would reduce P fixation and increase its bioavailability. Th is study aimed to determine the crop yield response and soil P lability changes after fi ve crop cycles under humic-complexed and non-humic-complexed superphosphate cumulative applications. Th e field experiment was conducted for 4 yr (2010-2013) in Tibagi, Brazil, in a Typic Hapludox, arranged in a randomized block design with two P sources; single superphosphate (SSP) and complexed single superphosphate (CSSP); and fi ve cumulative dosages (0, 48, 96, 144, and 192 kg P ha-1), divided over five consecutive crops: maize (Zea mays L.), wheat (Triticum aestivum L.), soybean [Glycine max (L.) Merr.], white oat (Avena sativa L.), and soybean. Grain yield was determined for each crop and soil samples were collected after the fi ft h harvest for Hedley P fractionation. Our results demonstrated that cumulative grain yield increased in line with the P dosage, however, higher agronomic efficiency was also observed at intermediate P dosages, when CSSP was used. Labile soil P was more influenced by the application of CSSP than SSP. Moreover, higher cumulative P dosages also increased labile and non-labile P, mainly in the 0- to 5-cm layer, indicating an intensive P pool reallocation in the surface soil layer. The study demonstrated that humic-complexed phosphate fertilizer can enhance soil P availability and improve crop grain yield in commercial field conditions.
- Subjects
CROP yields; BIOAVAILABILITY; PLANT nutrients; GRAIN yields; AGRICULTURAL productivity
- Publication
Agronomy Journal, 2016, Vol 108, Issue 4, p1692
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj2015.0561