Abstract

AFIF, Elías; PALENCIA, Pedro  and  OLIVEIRA, J. Alberto. Applying phosphorus sources to soils during different cuts of cultivated grass. Agrociencia [online]. 2013, vol.47, n.6, pp.553-566. ISSN 2521-9766.

The objetive of this study was to evaluate the availability of phosphorus (P) in different types of soils in Principado de Asturias, Spain, by applying different P sources with a dose of 200 mg P kg^-1 of soil. The grass composition, cultivated in pots, was a mixture of Agrostis tenuis cv. Highland 5 %, Poa pratense cv. Balin 5 %, Festuca rubra cv. Mystic 35 % and Lolium perenne cv. Nui 55 %. The treatments were generated with a complete factorial design of 12 types of soils, four sources of P and three dates of cutting. The sources of P were soil without fertilizer, diammonium phosphate (FD; 18 % N-46 % P₂O₅), P and K complex fertilizer (RF; 20-5 of P₂O₅ and K₂O), and simple calcium superphosphate (SF;18 % of P₂O₅), all of them with two repetitions. The grass analysis was carried out at 45, 90 and 135 d after sowing (96 experimental units). Results were analyzed with ANOVA using the SPSS 19 software, and the Tukey test (p≤ 0.05) for the cases that presented significant differences of the primary effects and interactions. A higher production of dry matter and P absorbed in all types of soils was produced with FD. The mean relative yield of dry matter of the grass, available P in the soil, leaf P concentration and total P absorbed showed significant differences between treatments.

Keywords : Mehlich 3; dry matter; apparent dissolution; phosphate fertilization; available phosphorus.

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