Nitrogen Compounds Transported in the Xylem of Sugar Cane

1976 ◽  
Vol 3 (3) ◽  
pp. 415 ◽  
Author(s):  
JC Waldron

Microcapillary tubes were inserted directly into xylem vessels of leaves and stalks of sugar cane (Saccharum spp.) to determine the form in which nitrogen is translocated from the roots towards the leaves. On a low nitrogen regime, the xylem fluid of both sugar cane and related species and genera contained nitrogen dominantly in the amino form. Nitrate was also present and increased markedly in some varieties when the supply of nitrate fertilizer to the roots was increased. The amino N and nitrate N levels tended to be lowest in the xylem fluid of those leaves most active in photosynthesis.

2003 ◽  
Author(s):  
M. L. C. Ripoli ◽  
L. A. Balastreire ◽  
T. C. Ripoli

1982 ◽  
Vol 72 (1) ◽  
pp. 111-117 ◽  
Author(s):  
D. J. Williams

AbstractThe recent attack by Pulvinaria iceryi (Sign.) on sugar-cane in Mauritius is discussed in the context of other attacks by sap-sucking Hemiptera in the Mascarenes. P. iceryi is compared with its allies P. elongata Newst., P. saccharia DeLotto, P. sorghicola De Lotto and P. tenuivalvata (Newst.). The name of P. longisqua De Lotto is sunk as a synonym of P. elongata and a key is presented for the five related species.


1982 ◽  
Vol 60 (12) ◽  
pp. 2741-2744 ◽  
Author(s):  
R. Frossard ◽  
N. J. Fokkema

Green flag leaves of spring wheat grown with low or high nitrogen supply in the form of Ca(NO3)2 were inoculated with Sporobolomyces roseus. Growth of the yeast in a controlled environment was followed for several days by culturing techniques. No consistent differences were found between the development of S. roseus on leaves from low or high nitrogen treated plants, suggesting that leaf exudates from low nitrogen treated plants still contain enough nitrogen compounds to support growth of S. roseus. Nitrogen fertilization obviously seems not to be an appropriate means to manipulate the phyllosphere mycoflora.


2004 ◽  
Vol 190 (4) ◽  
pp. 256-261 ◽  
Author(s):  
F. A. Gutierrez-Miceli ◽  
R. Morales-Torres ◽  
Y. de Jesus Espinosa-Castaneda ◽  
R. Rincon-Rosales ◽  
J. Montes-Molina ◽  
...  

Irriga ◽  
2006 ◽  
Vol 11 (3) ◽  
pp. 339-355 ◽  
Author(s):  
Marcio Aurélio Lins dos Santos ◽  
José Antonio Frizzone

IRRIGAÇÃO SUPLEMENTAR DA CANA-DE-AÇÚCAR (Saccharum spp) COLHIDA NO MÊS DE JANEIRO: UM MODELO DE ANÁLISE DE DECISÃO PARA O LITORAL SUL DO ESTADO DE ALAGOAS  Márcio Aurélio Lins dos Santos; José Antonio FrizzoneDepartamento de Engenharia Rural, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP,  [email protected]   1 RESUMO As usinas de açúcar e álcool no estado de Alagoas tem grande importância econômica. Para usar sua capacidade instalada torna-se necessário o uso de técnicas que aumentem sua produtividade e diminuam os custos de produção da cana-de-açúcar. A tecnologia de irrigação se tornou uma alternativa rentável para as condições do estado de Alagoas. Tomando-se por base a viabilidade da tecnologia de irrigação suplementar em cana soca de janeiro, durante apenas o primeiro estádio de desenvolvimento da cana-de-açúcar do litoral sul de Alagoas, a árvore de decisão foi utilizada na avaliação dos valores esperados dos retornos associados a diferentes alternativas disponíveis para a escolha do tomador de decisão. Levando em consideração as condições analisadas, os resultados do estudo permitiram obter as seguintes conclusões: existe um grande potencial de viabilidade técnica e econômica para irrigação do início de ano (janeiro), considerando os benefícios diretos e indiretos de aumento de produtividade agrícola, maior longevidade das soqueiras, redução de preparo de solo e plantio, tratos culturais e transporte de cana; a receita líquida esperada apresenta pequena sensibilidade às variáveis de custos com tratos culturais de soqueiras e preparo de solo e plantio. UNITERMOS: irrigação suplementar; Cana-de-açúcar; Análise de decisão  SANTOS, M. A. L. dos; FRIZZONE, J.A. ADDITIONAL IRRIGATION OF A SUGAR-CANE (Saccharum spp) CROP HARVESTED IN JANUARY: A DECISION ANALYSIS MODEL FOR THE SOUTHERN COAST OFALAGOAS STATE  2 ABSTRACT Sugar mills and alcohol distilleries inAlagoas State,Brazil, have great economical importance. The use of techniques that increase their productivity and reduce sugar-cane production costs is needed to use their installation capacity to the fullest. Irrigation technology has become a profitable alternative for the sugar-cane (ratoon cycle) conditions inAlagoasState. A decision tree was used to evaluate expected values form different available alternatives to choose the best decision maker, taking into consideration the viability of additional irrigation technology in cane beat in January, just during the first development stage of the sugar-cane (ratoon cycle) in the southern coast of Alagoas State. From the obtained results of the analyzed conditions, it was concluded that: there is a great technical and economical viability for irrigation in the beginning of the year (January), considering direct and indirect benefits of agricultural productivity increase, greater ratoon longevity, reduction of soil preparation and planting, culture treatments and sugar cane transport; the expected net income presents small influence of cost variables with ratoon culture treatments and soil preparation and planting. KEYWORDS: additional irrigation; sugar-cane; decision analysis


2020 ◽  
Vol 56 (3) ◽  
pp. 366-376 ◽  
Author(s):  
Jorge Alberto da Silva ◽  
Nora Solis-Gracia ◽  
John Jifon ◽  
Silvana Creste Souza ◽  
Kranthi Kiran Mandadi

2011 ◽  
Vol 10 (3) ◽  
pp. 2024-2033 ◽  
Author(s):  
D.M. Melotto-Passarin ◽  
E.V. Tambarussi ◽  
K. Dressano ◽  
V.F. De Martin ◽  
H. Carrer

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