https://www.alice.cnptia.embrapa.br/alice/handle/item/331 Artigo em periódico indexado (CPATSA) 2026-06-17T05:06:58Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187604 Título: Are greenhouse gas emissions and soil chemical characteristics affected by planting density, organic fertilization, and saline water irrigation in cactus pear cultivation? Autoria: ARAÚJO, C. de A.; ARAUJO, G. G. L. de; SIGNOR, D.; SANTOS, A. P. G.; MORAES, S. A. de; SILVA, T. G. F. da; LIMA, D. O.; RESENDE, A. M. D.; GOIS, G. C.; VOLTOLINI, T. V. Conteúdo: Understanding nitrogen dynamics in arid agricultural systems is essential for mitigating greenhouse gas (GHG) emissions in climate-constrained environments. This study evalu- ated the effects of planting density, organic fertilization, and saline water irrigation on soil chemical properties, carbon and nitrogen stocks, and emissions of CO2, CH4, and nitrous oxide (N2O) in cactus pear cultivation systems. A 2 × 2 × 2 factorial arrangement was used to test two planting densities (30,000 and 75,000 plants ha−1 ), two organic fertilizer rates (0 and 30 Mg ha−1 ), and two saline irrigation depths (0 and 25% of ET0). Higher planting density increased soil moisture and carbon content while reducing CO2 and CH4 emissions. Organic fertilization increased the soil C ratio and phosphorus availability and significantly enhanced N2O emissions, whereas unfertilized systems showed negative N2O fluxes. Saline water irrigation reduced N2O emissions, resulting in negative fluxes (−12.50 μg N m−2 h −1 ), indicating potential suppression of nitrification and denitrifica- tion pathways. None of the evaluated factors significantly affected soil nitrogen stocks. Total GHG emissions (CO2-eq) were lower in denser cultivation systems. These results demonstrate that the interaction among high planting density, organic fertilization, and supplementary saline irrigation modulates nitrogen transformations and N2O emissions in semi-arid soils, highlighting management strategies to mitigate nitrogen-derived GHG emissions in cactus-based agroecosystems. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187398 Título: Is it possible to substitute MAP with or without ethylene scrubbing for CA in marine transport of tree-ripe mango? Autoria: SHAHZAD, F.; DORON, M.; SARGENT, S. A.; FREITAS, S. T. de; BRECHT, J. K. Conteúdo: Mangos from South America can require 4 or more weeks for marine transport to the USA. To achieve these shipping durations, green (unripe) fruit are currently transported in air at 7-9°C (i.e., below their chilling threshold temperature). This results in poor quality, especially flavor, in the marketplace. Controlled atmosphere (CA) can allow mature-green mangos to be stored for up to 6 weeks at 12°C, but sensory quality is questionable; alternatively, tree-ripe mangos can be stored in CA for up to 4 weeks at 7°C with good flavor. Unfortunately, CA marine transport is not considered to be a feasible approach for these mango exports due to high expense and logistical issues. To overcome these obstacles, we targeted shipping tree-ripe mangos in modified atmosphere packaging (MAP) at lower temperatures with ethylene scrubbers to supplement MAP effects in inhibiting overripening during extended transport. We first determined the optimum O 2 and CO 2 concentrations for storage of ‘Tommy Atkins’, ‘Kent’, and ‘Keitt’ mangos using CA, then worked with Breatheway ® MAP and RYPEN™ ethylene control filters to duplicate the optimum CA in storage experiments simulating marine transport from South America to US markets. The study concluded with three commercial shipments from Brazil to New Jersey (‘Kent’ and ‘Tommy Atkins’) and Peru to California (‘Kent’). The optimum CA was 6 kPa O 2 plus 5 or 10 kPa CO 2 for ‘Tommy Atkins’ and 4 kPa O 2 plus 5 or 10 kPa CO 2 for ‘Keitt’. The MAP equilibrated at 6 kPa O 2 + 9 kPa CO 2 for both cultivars. The CA and MAP both slowed ripening in terms of softening, external and internal color changes, and changes in soluble solids and titratable acidity. Scrubbing reduced ethylene in the MAP by 85% and further inhibited ripening-related softening and color changes. Sensory evaluation confirmed that fruit in MAP remained less ripe than the controls during shelf life. Commercial shipping tests of mangos in MAP with or without ethylene scrubbing, from Brazil to New Jersey, USA and from Peru to California, USA, confirmed the lab results. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187359 Título: Production of cassava seedlings on substrates based on decomposed buriti stem. Autoria: OLIVEIRA, P. S. T. de; AZEVEDO, G. A. de; PEREIRA, R. Y. F.; SILVA, A. F.; ANDRADE, H. A. F. de; CORDEIRO, K. V.; BARROSO, V. B.; MACHADO, N. A. F.; MATOS, R. R. S. da S. Conteúdo: n the cassava (Manihot esculenta Crantz) cultivation system, planting seedlings directly in the field is widely used. However, establishment of plants by this method is slow, taking about 15 days to start the formation of shoots and roots. The plant in this phase is not very competitive, which leads to the formation of uneven and low-productivity areas. Production of seedlings on substrates is an alternative that can improve the uniformity of the plant stand, as well as allow more careful selection of the best propagules. Viability of this propagation method depends on the substrate, which must have ideal physical and chemical properties to meet the needs of the crop. The objective of this work was to evaluate the use of decomposed buriti stem (Mauritia flexuosa L. f) as a substrate in the propagation of cassava seedlings. The substrates were composed of decom- posed buriti stems and soil in the following proportions: 0:100; 20:80; 40:60; 60:40; 80:20; and 100:0 (volume). The addition of decomposed buriti stem improved development of the aerial part, provided greater survival for cassava seedlings in an increasing linear fashion, and promoted increases in the levels of N, P, K, Ca, and Mg of cassava seedlings. It was determined that there is agronomic efficiency in the use of buriti residue for the production of cassava seedlings. 2022-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187367 Título: Potencial de água no solo e na folha da videira “Sugraone” sob déficit hídrico. Autoria: MARINHO, L. B.; RODRIGUES, J. J. V.; SOARES, J. M.; SANTOS, I. S.; BRANDÃO, E. O.; LIMA FILHO, J. M. P. Conteúdo: Propôs-se com este estudo conhecer a variação do potencial da água no solo e na folha da videira “Superior Seedless”, tal como o crescimento da baga da uva sob diferentes condições de irrigação na fase de maturação da uva, na Fazenda Agrobrás Tropical do Brasil S/A, em Casa Nova, BA, em outubro de 2007. A videira foi irrigada nas épocas 21, 13 e 5 dias antes da colheita, com lâminas de 100, 50 e 0% da evapotranspiração da cultura e um tratamento adicional (“manejo do produtor”). O potencial da água na folha e no solo foi aferido com a câmara de pressão e tensiômetros, respectivamente. O potencial da água da folha variou de -0,95 a -1,80 MPa, ao meio- dia e de -0,10 a -0,27 MPa, ao alvorecer. O potencial mátrico da água do solo atingiu valores de -5 a -79,5 kPa para os tratamentos menos e mais deficitários. O potencial da água na folha ao meio-dia sugere que, em alguns dias, o parreiral se encontrava sob estresse moderado e, em outros, sob estresse severo, independendo dos tratamentos de déficit hídrico. Ao alvorecer, o potencial indicou que as videiras estavam sob estresse suave ou em condições adequadas de manejo de água, mesmo a potencial matricial do solo elevado, em que não houve redução significativa no crescimento das bagas das uvas. 2011-01-01T00:00:00Z