Phosphorus Placement Effects on Phosphorous Recovery Efficiency and Grain Yield of Wheat under No-Tillage in the Humid Pampas of Argentina

PABLO A. BARBIERI; HERNÁN R SAINZ ROZAS; COVACEVICH FERNANDA; HERNÁN E. ECHEVERRÍA

International Journal of Agronomy

Hindawi

Lugar: London; Año: 2014 p. 1 - 12

1687-8159

No-till (NT) affects dynamics of phosphorus (P) applied. Wheat response to P fertilization can be affected by available soil P, grain yield, placement, rate, and timing of fertilization. Furthermore, mycorrhizal associations could contribute to improving plant P uptake. Three experiments were used to evaluate P rate (0, 25, and 50kgPha−1) and fertilizer placement (broadcasted ordeep-banded)effectsinNTwheatonPrecoveryefficiency(PRE)yieldandarbuscularmycorrhizalcolonization(AMC)which was assessed in one experiment. Fertilization increased dry matter (DM) and accumulated P. Broadcasted P produced lower P accumulationthandeep-bandedPonlyattillering.PhosphorusratedecreasedPRE,andplacementmethoddidnotaffectit.Grain yield response was increased by P rate (857 and 1805kgha−1 for 25 and 50kgPha−1, resp.) and was not affected by placement method (4774 and 5333kgha−1 for broadcasted and deep-banded, resp.). Deep-banded P depressed root AMC compared with broadcastapplications.HighestAMCinPbroadcastedtreatmentscouldhelptoexplainthelackofdifferencesbetweenplacement methods.TheseresultsindicatethatMollisolhavelowPretentioncapacity.Therefore,broadcastedPcouldbeusedasanalternative offertilizermanagementforNTwheat.