Data/hora: 24/06/2024 06:53:03

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	27/07/1993	
Data da última atualização: 	07/10/2004	
Autoria: 	LEWIS, J. A.	
Afiliação: 	The Agricultural Research Station, Northern Division, Thinnavali, Jaffna, Sri Lanka.	
Título: 	Irrigated soybeans and the production of other legumes on the latosolsof Sri Lanka.	
Ano de publicação: 	1981	
Fonte/Imprenta: 	In: CONFERENCE ON IRRIGATED SOYBEAN PRODUCTION IN ARID IN AND SEMI-ARID REGIONS, 1979, Cairo. Proceedings. Urbana-Champaign : INTSOY / University of Illinois, 1981. p.86-91. (INTSOY. Series, 20).	
Idioma: 	Inglês	
Notas: 	Ver trabalho preliminar no PC 3730.	
Conteúdo: 	This paper reports on the irrigation needs of soybeans when grown on latosols in Sri Lanka. High yields were obtained with irrigation, ranging from 3,000 to 6,000 kg/ha on research plots. In farmer's fields, yields averaged 2,000 to 2,500 kg/ha. Irrigation is from groundwater, sothe exact water requirements at different stages of crop production must be determined lysimetry experiments were conducted to determine the rate of evapotranspiration (ET). Potential evapotranspiration (ETpot)was computed using the penman equation. Evaporation from the class A pan (E O) was monitored. The following values were recorded at the major stages of development: early growth stage, ET/ E O = 1; flowering stage, ET/E O = 1.1; pod-development stage, ET/E O = 1.15; and bean-filling stage, ET/E O = 1.2. Hence, yields may be adversely affected if the crop is stressed during the latter part of pod development and during the bean-filling stage. To study soybean response under different water availability in the soil, an experiment was conducted, irrigating soybeans at three levels of water stress: 0.26 to 0.33 bars of mercury, 0.39 to 0.46 bars, and 0.52 to 0.59 bars. The experiment is still in the field, so conclusions about pod-size development and yields cannot be made. However, the results to date indicate that at the highest stress (0.52 to 0.59 bars), pod development is advanced and less vegetative growth occurs. Potentially, the acreage of soybeans as an alternate crop on the latosols of the northwest regions of Sri Lanka	
Palavras-Chave: 	Soybean.	
Thesagro: 	Clima; Irrigação; Soja; Solo.	
Thesaurus Nal: 	climate; irrigation; soil; Sri Lanka.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)