SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

SHARMA, P. N.; HELWEG, O. J..

Small reservoir irrigation system optimization: model development; The nonlinear programming algorithm; Results and discussions; Conclusions; Applicability for North-East Brazil.

Annual report of consultancy, 1984.

Palavras-chave: Reservatório; Irrigação; Água; Irrigation; Water..

Ano: 1982

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/953300

Controle de percolação em pequenos reservatórios.

SHARMA, P. N..

Organization of Report: research strategy for the improvement of land and water resources of the Semi-Arid Tropics of Northeast Brazil; runoff inducement for agriculture in very Arid Zones of the Northeast Brazil; water production function of sorghum for NE Brazil; optimization of small reservoir systems for NE Brazil; seepage control; miscellaneous activities.

Tipo: Documentos (INFOTECA-E)

Palavras-chave: Consultoria; Relatorio; Regiao semi-arida; Management; Consultancy report; Northeast; Água; Manejo; Solo; Brazil; Soil; Water.

Ano: 1984

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133186

Effect of clearing native forest (Caatinga) strips on some hydrologic components of micro-watersheds.

LOPES, P. R. C.; SILVA, A. de S.; SHARMA, P. N..

Uns dos principais fatores que contribuem para a baixa eficiencia de utilizacao de agua em pequenos reservatorios na regiao semi-arida sao as perdas por percolacao e por evaporacao. Desta forma, torna-se de fundamental importancia o desenvolvimento e utilizacao de tecnicas apropriadas para o controle destas perdas, principalmente em solos que apresentam baixo conteudo de argila. A percolacao depende muito das propriedades hidraulicas do solo, razao pela qual varia de um tipo para outro. Varios materiais impermeabilizantes foram testados com a finalidade de se determinar sua eficiencia no controle da percolacao. Os tratamentos testados foram: 1) testemunha (reservatorio de terra local sem revestimento); 2) reservatorio revestido com argila compactada e...

Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)

Palavras-chave: Reservatório; Percolação; Impermeabilizante; Material.; Água; Custo; Perda; Revestimento.; Water.

Ano: 1991

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/154425

SHARMA, P. N.; SILVA, A. de S..

The influences of clearing native vegetation (Caatinga) in contour strips at 25 cm vertical interval on evaporation losses in cleared strips, annual runoff efficiency and annuall soil loss on gently sloped micro-waterheds in the arid zones of Northeast Brazil are reported. The alternate native vegetation (Caatinga) strips function very effectively as windbreaks thus reducing evaporation losses substantially in the leeward cleared strips. The runoff measured at the micro-watershed with cleared strips was many-fold lower than the runoff obtained at a completely denuded watershed even when it was protected by narrow based channel terraces. However, the annual runoff efficiency can be significantly increased in a strip cleared watershed if narrow based channel...

Tipo: Artigo de periódico

Palavras-chave: Terra arida; Watershed; Management; Arid land.; Irrigação; Solo; Água; Caatinga; Bacia Hidrográfica; Desmatamento; Manejo; Vegetação.; Deforestation; Irrigation; Soil; Vegetation; Water..

Ano: 1988

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133195

Funcoes de producao com agua do sorgo para o Nordeste do Brasil.

SHARMA, P. N.; ALONSO NETO, F. B..

Tipo: Parte de livro

Palavras-chave: Brasil; Nordeste; Sorghum; Production; Northeast.; Irrigação; Manejo; Produção; Sorgo; Solo.; Brazil; Irrigation..

Ano: 1984

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134423

Improvement of the land and water resources of the semi-arid regions of Northeast Brazil: a proposal for research.

SHARMA, P. N..

Traz uma rapida descricao do clima e solo do Nordeste do Brasil e aborda o desenvolvimento de tecnologias para manejo de recursos de solo e agua na regiao.

Native forest (Caatinga) watershed management for runoff in ducement for irrigation.

Palavras-chave: Recursos naturais; Proposta.; Água; Irrigação; Clima; Manejo; Pesquisa; Solo.; Water; Irrigation.

Ano: 1982

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/127384

SHARMA, P. N.; SILVA, A. de S..

The results of hydrological investigations for two years on eight levels of native forest (Caatinga) watershed management, principally for runoff inducement for water harvesting for irrigation, are reported. The first four watershed treatments consisted of one or a combination of intensified surface drainage treatments wthing native forest watershed, clearing alternate contour strips of native forest at 250cm vertical intervals shile alternate strips are maintained in native cover, constructing narrow-based channel terraces below cleared strips and application of common slat in cleared strips for impermeabilization of the soil. The next three watershed treatments are without native forest and the eighth (the last) watershed is maintained undisturbed under...

Tipo: Artigo de periódico

Palavras-chave: Nordeste; Native forest; Management; Watershed; Northeast; Arid zone; Água; Bacia Hidrográfica; Caatinga; Irrigação; Manejo; Solo; Vegetação Nativa; Zona Arida; Runoff irrigation; Soil; Water.

Ano: 1987

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133194

Research strategy for the improvement of land and water resources of the semi-arid tropics of North-East Brazil.

SHARMA, P. N.; PORTO, E. R..

Climate; Soils; Socio-economic conditions.

Runoff inducement for agriculture in very arid zones of the Northeast of Brazil.

Palavras-chave: Recursos hídricos.; Solo; Água; Pesquisa; Terra.; Soil.

Ano: 1982

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/932392

Water production function of maize for Northeast Brazil.

SHARMA, P. N.; ALONSO NETO, F. B.; PORTO, E. R.; SILVA, A. de S..

The concept of runoff inducement for agricultural purposes is discussed in detail. its implications to the Northeast Brazilian conditions and necessity for additional research is explained. An exaustive review of the research at various places in the world is included. The latest work being carried out at the Centro Nacional de Pesquisa do Tropico Semi-Arido (CPATSA/Embrapa) (Center of Agricultural Research for Semi-Arid Tropics) is explained in detail. This work included development of eight small watersheds varying in size from 1.0 ha. to 2.7 ha. for hydrologic evaluation of various simple low cost runoff inducement methods under natural "caating" conditions on shallow to medium deep Latossols. The various methods of runoff inducement include...

Tipo: Artigo de periódico

Palavras-chave: Nordeste; Regiao arida; Semi-arida; Management; Northeast; Semi-arid; Arid region.; Solo; Água; Agricultura; Manejo.; Agriculture; Brazil; Soil; Water..

Ano: 1984

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133190

SHARMA, P. N.; PEREIRA, J. R..

Estudou-se atraves de um experimento em blocos ao acaso, os efeitos de quatro niveis de nitrogenio, em diferentes condicoes de umidade, sobre os estagios de crescimento, embonecamento, formacao de graos e prdutividade do milho (Zea mays L.) e as relacoes entre a produtividade e os tres primeiros estagios. Os fatores da resposta de producaobaseados na equacao de Doorenbos e Kassam variaram acentuadamente, nao so com os diferentes estatios de crescimento, mas tambem com diferentes niveis de nitrogenio e os diferentes niveis de agua. Assim, esta equacao nao pareceu ser valida para explicar a resposta de produtividade a niveis de agua. Sugeriu-se um equacao linear modificada. Nesta equacao, a intercessao K1 e inclinacao K2 sao os fatores da resposta de...

Tipo: Artigo de periódico

Palavras-chave: Sistema; Nordeste; Management; System; Brasil; Northeast.; Água; Irrigação; Milho.; Corn; Irrigation; Water..

Ano: 1988

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133191

Water production function of sorghum for Northeast Brazil.

SHARMA, P. N.; ALONSO NETO, F. B..

The results of an experiment to determine the water production function of sorghum for Northeast Brazilian conditions are reported. The experiment was designed in two random blocks consisting of four growth states for irrigation deficit and four levels of nitrogen. The crop response to water was found to be of quadratic nature. Regression coeficients were developed for each nitrogen and growth stage treatment between water use and grain yields. The most critical stage was found to be the vegetative stage followed by flowering and grainn formation stages. The yield response factors as according to Doorenbos and Kassam were found to with differente irrigation levels. A modified linear equation has been suggested. The coefficients of this modifieed equation...

Tipo: Artigo de periódico

Palavras-chave: Nordeste; Sorghum; Production; Northeast; Água; Produção; Sorgo; Water.

Ano: 1986

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133189

Water production functions of sorghum for North East Brazil.

SHARMA, P. N.; ALONSO NETO, F. B..

Os resultados do experimento para determinar a função de produção com água do sorgo para as condições no Nordeste do Brasil são descritos.