Atributos químicos e matéria orgânica em complexos florestais periodicamente inundados na restinga da marambaia - RJ

This study aimed to evaluate and characterize the chemical properties of soil organic matter under two periodically flooded forest formations on the island of Marambaia, Rio de Janeiro. These formations differ on the degree of soil water saturation, caused by the influence of water table, and in the (F1) formation presents the water table nearer the surface compared to the (F2) formation. Samples were collected in layers from 0.00 to 0.05, 0.05-0.10 and 0.10-0.20 m. The soil properties evaluated were: pH, H+ + Al+ 3, Ca+2, Mg+2, Na+, K+, P, N, total organic carbon (TOC) and base saturation (V%), humin carbon fraction (C-HUM), carbon of humic acid fraction (HAF-C) and fulvic acid fraction carbon (FAF-C). Statistically higher pH values were observed for F1. In F2 there are higher values of Mg+2, P, N and V% value. Correlation was found between the concentrations of Mg+2, N, humic acid and fulvic acid with water table in F1, and water table in F2 with Na+ and K+. Fraction C-HUM was more representative of the total organic carbon, followed by C-HAF and C-FAF. The TOC levels were higher in F1. The C /N ratio was lower in F2, with values ranging between 9 and 12, and F1 were found higher values of this relationship, ranging from 9 to 15. Among the pathways of formation of organic soils in both areas it appears that the major route for organic matter accumulation is the inheritance route.

Evapotranspiração e eficiência do uso da água no primeiro ciclo produtivo da figueira 'Roxo de valinhos' submetida a cobertura morta

Evaluated the evapotranspiration (ETc) and the efficiency of water use (USA) by the fig tree 'Purple Valinhos' submitted to irrigation and mulching (bagacilho of sugar cane crushed) in the first production cycle, at conditions of Botucatu, St. Paul. We used the method of soil water balance and to obtain the reference evapotranspiration method was used Montheit FAO Penman 56. For the assessment of crop coefficients (kc) we adopted the following phenological distribution: phase 1 - between transplanting and 20% of the vegetative (DV), ii) phase 2 - 20 to 80% DV, and iii) phase 3 - fruiting. Observe the cumulative ETc 409.4 and 465.8 mm in 254 days after transplanting (DAT) and averages of 1.47 and 1.67 mm day(-1), with and without mulching (CC and SC). The crop coefficients (kc) mediums were 0.16, 0.43 and 0.49 for SC and 0.18, 0.44 and 0.50 for CC, in phases 1 and 3, respectively. The EUA values decrease with increasing the volume of water received and ranged between 1.65 and 3.32 kg of green figs per m(3) of water for irrigated SC and CC.

Subdoses de glyphosate, nitrogênio e lâminas de água em feijoeiro de inverno irrigado

Pós-graduação em Agronomia - FEIS

Avaliação do crescimento de plantas de milho em função de doses de potássio e estresse hídrico

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Zonas homogêneas de atributos do solo para o manejo de irrigação em pomar de videira

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Desenvolvimento de cultivares de beterraba sob diferentes tensões da água no solo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Regime hídrico de alguns solos de Jaboticabal

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Retenção de água em dois tipos de latossolos sob diferentes usos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Cana-de-açúcar: respostas da planta e do solo a diferentes níveis de irrigação no semiárido nordestino

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Avaliação da erodibilidade pelo método Inderbitzen em solo não saturado da região de Bauru - SP

Pós-graduação em Engenharia Civil e Ambiental - FEB

PHYSICAL QUALITY OF AN OXISOL UNDER NO-TILLAGE AND CONVENTIONAL TILLAGE

The understanding and quantification of the impact of tillage systems in their physical quality are fundamental in the development of sustainable agricultural systems. This study aimed to evaluate the quality of an Oxisol under conventional tillage (CT) and no-tillage system (NT), through different physical indicators. The management systems were: CT and NT for seven or eight consecutive years (medium textured soil) and CT and NT by nine and ten consecutive years (clay soil). Were determined, at the layers 0-0.10, 0.10-0.20; 0.20-0.30 m, soil resistance to penetration, total soil porosity, macroporosity and microporosity, soil water retention, S index, soil bulk density, maximum density and relative bulk density. Was observed great variation of soil resistance to penetration throughout the soybean and corn cycles, with its highest values were found in the surface layers. The NT showed greater resistance to penetration. Among the management systems, the results against indicators of soil physical quality were similar.

Variabilidade entre materiais genéticos de eucalyptus spp quanto à distribuição de raízes finas em latossolos profundos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Potencial de uso agrícola de levedura seca inativa de cana-de-açúcar e de resíduos orgânicos

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Relação da tolerância ao déficit hídrico com o teor e acúmulo de nitrogênio, fósforo e potássio em cultivares de cana-de-açúcar

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Qualidade da semeadura e do arranquio mecanizado do amendoim

Pós-graduação em Agronomia (Ciência do Solo) - FCAV