ORCID Profile
0000-0003-2163-5630
Current Organisation
Universidade de São Paulo
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Publisher: Wiley
Date: 14-04-2014
DOI: 10.1111/NPH.12810
Abstract: A basic understanding of nutrition effects on the mechanisms involved in tree response to drought is essential under a future drier climate. A large‐scale throughfall exclusion experiment was set up in Brazil to gain an insight into the effects of potassium ( K ) and sodium ( N a) nutrition on tree structural and physiological adjustments to water deficit. Regardless of the water supply, K and N a supply greatly increased growth and leaf area index ( LAI ) of E ucalyptus grandis trees over the first 3 yr after planting. Excluding 37% of throughfall reduced above‐ground biomass accumulation in the third year after planting for K ‐ supplied trees only. E . grandis trees were scarcely sensitive to drought as a result of the utilization of water stored in deep soil layers after clear‐cutting the previous plantation. Trees coped with water restriction through stomatal closure (isohydrodynamic behavior), osmotic adjustment and decrease in LAI . Additionally, droughted trees showed higher phloem sap sugar concentrations. K and N a supply increased maximum stomatal conductance, and the high water requirements of fertilized trees increased water stress during dry periods. Fertilization regimes should be revisited in a future drier climate in order to find the right balance between improving tree growth and limiting water shortage.
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 1990
Publisher: Elsevier BV
Date: 09-2021
Publisher: FapUNIFESP (SciELO)
Date: 10-2011
DOI: 10.1590/S0100-06832011000500018
Abstract: In agricultural systems the N-NH4+ and N-NO3- contents is significantly affected by soil management. This study investigated the dynamics of inorganic nitrogen (N NH4+ and NO3-) in an experimental evaluation of soil management systems (SMSs) adopted in 1988 at the experimental station of the ABC Foundation in Ponta Grossa, in the Central South region of the State of Paraná. The objective of this study was to evaluate the changes in N-NH4+ and N-NO3- flux in the surface layer of a Red Latosol arising from SMSs over a 12-month period. The experiment was arranged in a completely randomized block design in split plots, in three replications. The plots consisted of the following SMSs: 1) conventional tillage (CT) 2) minimum tillage (MT) 3) no-tillage with chisel plow every three years (NT CH) and 4) continuous no-tillage (CNT). To evaluate the dynamics of inorganic N, the subplots represented s lings (11 s ling times, T1 - T11). The ammonium N (N-NH4+) and nitric N (N-NO3-) contents were higher in systems with reduced tillage (MT and NT CH) and without tillage (CNT) than in the CT system. In the period from October 2003 to February 2004, the N-NH4+ was higher than the N-NO3- soil content. Conversely, in the period from May 2004 to July 2004, the N-NO3- was higher than the N-NH4+ content. The greatest fluctuation in the N-NH4+ and N-NO3- contents occurred in the 0-2.5 cm layer, and the highest peak in the N-NH4+ and N-NO3- concentrations occurred after the surface application of N. Both N-NH4+ and N-NO3- were strongly correlated with the soil organic C content, which indicated that these properties vary together in the system.
No related grants have been discovered for Marisa de Cássia Piccolo.