Data/hora: 14/06/2024 02:32:22

Biblioteca(s): | Embrapa Amazônia Oriental; Embrapa Arroz e Feijão; Embrapa Cerrados; Embrapa Meio Norte / UEP-Parnaíba; Embrapa Meio-Norte; Embrapa Rondônia; Embrapa Semiárido; Embrapa Soja; Embrapa Trigo.
Data corrente: | 04/10/1993
Data da última atualização: | 21/06/2000
Autoria: | GUIMARAES, C. M.
Título: | Effects of soil moisture and atmospheric conditions on the water status of soybean plants (Glycine max (L.) Merrill).
Ano de publicação: | 1979
Fonte/Imprenta: | Mississippi: Mississippi State University, 1979.
Páginas: | 90p.
Idioma: | Inglês
Notas: | M.Sc. Thesis.
Conteúdo: | Two experiments were conducted in the field to study the effects of soil moisture and atmospheric conditions on the water status of soybeans. Leaf diffusive resistance at midday, and leaf water potential early in the morning and at midday were correlated with soil moisture and atmospheric parameters. The atmospheric parameters studied were: solar radiation, potential evapotranspiration, pan evaporation and maximum air temperature. In addition leaf temperatures were correlated with leaf diffusive resistance. Atmospheric conditions explained the variations in leaf diffusive resistance and leaf water potential of non-stressed plants better than in the stressed plants. Water status of nonstressed plants in 1977 were explained better than in 1978. Probably factors associated with limited volume of soil, and different soil structure inside the soil containers used in 1978 were the reason for those variations of results. The highest yields were obtained from plants not stressed during the entire season. Treatments A (water stress initiated during the flowering), B (water stress initiated during early pod formation), and C (water stress initiated during later pod filling) reduced seed yield 73%, 70% and 44%, respectively. The weight of 100 seeds produced by soybean plants of treatments A and the control were the same. However, the seeds on plants of treatments B and C were significantly smaller. Stress applied during the late pod filling stage produced the smallest seeds. Information obtained from this experiment illustrated two points: (1) the importance of studying plant water status under natural environmental conditions, and (2) water stress during late pod filling is more deleterious on soybean yield than water stress imposed at any other stage.
Palavras-Chave: | Atmospheric condition; Balanco de agua; Condicao atmosferica; Efeito; Estresse hidrico; Meteorological elements; Metereological elements; Plant; Plant weater relations; Potencial; Potential; Solos; Soybean.
Thesagro: | Água; Água do solo; Atmosfera; Balanço hídrico; Clima; Evapotranspiração; Glycine Max; Manejo de Água; Planta; Relação Água-Planta; Retenção de água no solo; Soja; Solo; Stress; Temperatura; Umidade do Solo.
Thesaurus Nal: | climate; soil; soil water content; Soil water retention; soybeans; water; water balance; water stress.

Categoria do assunto:

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P Recursos Naturais, Ciências Ambientais e da Terra

Registro original: | Embrapa Cerrados (CPAC)

Exemplares:

CPAMN - (8993-1) - ADD - TS - PP - 74/79 -  - 1979.00074 - DIS
CPAMN-UEPP - (5507-1) - ADD - TS - PP - TS 003/1979 -  - TS003/1979 - DIS
CPATSA - (24616-1) - ADD - TS - PP - 67/1979 -  - 1979.00067 - DIS
CNPAF - (1327-1) - UPC - TS - PP - T 068/79 - GUI - 1979.0068 - DIS
CPATU - (31807-1) - ADD - TS - -- - 1979/050 - GUI - 1979/050 - DIS
CPAC - (16550-1) - ADD - TS - -- - T061/79 - GUI - T061/79 - DIS
CPAF-RO - (4531-1) - ADD - TS - -- - T-03/79 - GUI - T-03/79 - DIS
CNPT - (30614-1) - ADD - TS - -- - TS-1034 -  - 1034 - DIS
CNPSO - (35282-1) - ADD - TS - PP - 72/1979 -  - 72/1979 - DIS