https://www.alice.cnptia.embrapa.br/alice/handle/item/232 Artigo em periódico indexado (CPAMN) Sat, 11 Apr 2026 17:14:51 GMT 2026-04-11T17:14:51Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186150 Título: Water deficit limits growth and yield of cowpea cultivars O déficit hídrico limita o crescimento e o rendimento de cultivares de feijão-caupi. Autoria: SANTOS, T. O. da S.; ANDRADE JUNIOR, A. S. de; BASTOS, E. A.; SOUZA, H. A. de; SOUSA, R. S. de; PEREIRA, L. da S.; CARDOSO, M. J. Conteúdo: Irrigation management is essential for applying the required amount of water to crops. This study evaluated the growth and yield of cowpea cultivars as a function of water regime. The experiment was conducted in Teresina, Piauí State, Brazil, from July to September 2022. The experimental design comprised a randomized block in a split-plot scheme with four replicates. The treatments comprised five water regimes (133.80, 191.70, 249.00, 303.00, and 357.00 mm per cycle) and two cowpea cultivars (BRS Inhuma and BRS Olho Negro). Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186150 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186146 Título: Parameterization of the APSIM model in a tropical environment under intercropping and rainfed conditions. Autoria: OLIVEIRA, J. R. de; ANDRADE JUNIOR, A. S. de; SOUZA, H. A. de; BASTOS, E. A.; BOSI, C.; PEZZOPANE, J. R. M.; BEZERRA, R. L. S.; SANTOS, L. R. C. dos Conteúdo: Mechanistic models, such as the Agricultural Production Systems Simulator (APSIM), are used to predict the growth of pasture species and grain crops in monoculture and intercropping systems. The objective of this study was to evaluate the performance of the APSIM model in simulating the growth and productivity of maize and Marandu palisadegrass in monoculture and intercropping systems in eastern Maranhão, Brazil. Data on biomass partitioning, climate, and soil properties were collected. Model calibration involved parameterizing the light extinction coefficient and radiation use efficiency, as well as adjustments to the phenological and structural parameters of maize. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186146 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185568 Título: Parameterization of the apsim model for irrigated maize signalgrass intercropping system. Autoria: OLIVEIRA, J. R. de; ANDRADE JUNIOR, A. S. de; BOSI, C.; PEZZOPANE, J. R. M.; SOUZA, H. A. de; BASTOS, E. A.; BEZERRA, R. L. S.; SILVA, M. E. C. da Conteúdo: The Agricultural Production Systems Simulator (APSIM) has been widely used in studies to simulate the growth and development of pastures and grain crops in single-crop and intercropping cultivation systems. The objective of this study was to parameterize the APSIM and evaluate its effectiveness in estimating the growth and productivity of maize and signalgrass (Urochloa ruziziensis) in single-crop and intercropping systems in northern Piauí State, Brazil. Data were collected from the experimental field of the Brazilian Agricultural Research Corporation (Embrapa Mid-North) in Teresina, Piauí State, Brazil. The photosynthetically active radiation and soil water content were the main measurement parameters to calibrate the light extinction coefficient and radiation use efficiency, with adjustments to the phenological and structural parameters of maize. The leaf, stalk, and total shoot dry weights and leaf area index (LAI) of both crops and maize organs (husk, cob, and grains) were evaluated. The model showed coefficient of determination (R2) values ranging from 0.81 to 0.99 and Nash–Sutcliffe efficiency (NSE) values ranging from 0.72 to 0.99 for single-crop cultivation of signalgrass; R2 values ranging from 0.87 to 0.93 and NSE values ranging from 0.62 to 0.67 for intercropping cultivation of signalgrass; R2 values ranging from 0.43 to 0.97 and NSE values ranging from -3.33 to 0.95 for single-crop cultivation of maize; and R2 values ranging from 0.30 to 0.93 and NSE values ranging from 0.21 to 0.92 for intercropping cultivation of maize. The APSIM model provided an adequate fit for growth simulations of signalgrass and maize in single-crop and intercropping systems. It can simulate the growth and yield of irrigated signalgrass and maize in single-crop and intercropping systems. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185568 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185302 Título: Water retention and availability in an Ultisol under an integrated Crop–Livestock–Forest system in the Matopiba region, Brazil. Autoria: SILVA, M. L. do N.; LEITE, L. F. C.; OLIVEIRA, F. P. de; BLANCO, F. F.; SOUZA, H. A. de; SOUSA, I. T.; SOUSA, T. S. de; SAGRILO, E.; VERAS, D. S.; MORAIS, R. C. de S.; OLIVEIRA JUNIOR, J. O. L. de Conteúdo: Soil water retention and availability are influenced by intrinsic soil properties, management practices, and climate regimes. This study aimed to evaluate water retention and availability in an Ultisol under different integrated production systems in the Brazilian Cerrado. The systems analyzed included Crop–Livestock Integration (CLI), Livestock–Forest Integration (LFI), Crop–Forest Integration (CFI), no-tillage (NT) and native Cerrado vegetation (NV). Disturbed samples were collected for physical and chemical characterization, while undisturbed samples were used to determine water retention curves at depths of 0.00–0.10, 0.10–0.20, and 0.20–0.40 m. From these curves, water availability, pore-size distribution, differential log-pore-radius curves, most frequent pore radius, and relative hydraulic conductivity were estimated using the Mualem–van Genuchten model. Confidence intervals were used to evaluate differences between retention curves. The CLI system showed lower water content at saturation (14–30%) and field capacity (10–20%) compared to CFI, LFI, and NT. The NT system exhibited higher water availability across all layers (28, 48, and 46%, respectively) than CLI. Alterations in pore structure, likely due to the short integration period and monoculture history in CLI, resulted in lower water retention. Conversely, CFI, LFI, and NT showed higher retention and availability, attributed to higher organic matter content and more stable structural pores. Integrated production and no-tillage systems, especially when adopted long-term, enhance soil water retention and availability in the Brazilian Cerrado. Thu, 01 Jan 2026 00:00:00 GMT https://www.alice.cnptia.embrapa.br/alice/handle/doc/1185302 2026-01-01T00:00:00Z