scholarly journals The response of carrot (Daucus carota L.) and onion (Allium cepa L.) seedlings to mechanical impedance and water stress at sub-optimal temperatures

1999 ◽  
Vol 22 (3) ◽  
pp. 229-242 ◽  
Author(s):  
W. R. WHALLEY ◽  
W. E. FINCH-SAVAGE ◽  
R. E. COPE ◽  
H. R. ROWSE ◽  
N. R. A. BIRD
Keyword(s):  
Water Stress ◽  
Allium Cepa ◽  
Daucus Carota ◽  
Mechanical Impedance ◽  
Daucus Carota L ◽  
Allium Cepa L

Zone tillage systems for onion and carrot production on muck soils

2004 ◽  
Vol 84 (4) ◽  
pp. 1167-1169 ◽  
Author(s):  
C. J. Swanton ◽  
S. Janse ◽  
K. Chandler ◽  
B. D. Booth
Keyword(s):  
Key Words ◽  
Allium Cepa ◽  
Daucus Carota ◽  
Conventional Tillage ◽  
Viable Alternative ◽  
Reduced Tillage ◽  
Tillage Systems ◽  
Daucus Carota L ◽  
Allium Cepa L

This study examined whether zone tillage was a viable alternative to conventional tillage for carrot [Daucus carota L. var. sativus (Hoffm.) Arcang.] and onion (Allium cepa L.) production on muck soils. Total and marketable yields under zone tillage were e qual to (carrot) or greater than (onion) yields under conventional tillage. Carrot yields did not differ between raised and flat bed treatments. Key words: Reduced tillage, conventional tillage, Daucus carota L. var. sativus (Hoffm.) Arcang.); Allium cepa L.

Consistency of long-term marketable yield of carrot and onion cultivars in muck (organic) soil in relation to seasonal weather

2010 ◽  
Vol 90 (5) ◽  
pp. 755-765 ◽  
Author(s):  
M. T. Tesfaendrias ◽  
M. R. McDonald ◽  
J. Warland
Keyword(s):  
Allium Cepa ◽  
Daucus Carota ◽  
Organic Soil ◽  
Data Sets ◽  
Fresh Market ◽  
Marketable Yield ◽  
Daucus Carota L ◽  
Weather Patterns ◽  
The Mean

To identify carrot and onion cultivars that provide consistent marketable yields, we tracked the yields of five fresh market carrot [(Daucus carota L. subsp. sativus (Hoffm.) Arcang.] and six onion (Allium cepa L.) cultivars for at least 13 yr. Relationships between long-term weather variables and marketable yields were also investigated. The effects of cultivar, year and cultivar × year interactions on yield of carrots and onions were assessed. Cultivar and year had significant effects on carrot and onion yields, while the interaction was significant in only one of four data sets of carrot yield. Carrot cv. Cellobunch (95.4 t ha–1) and onion cv. Corona (74.1 t ha–1) had the highest mean marketable yields over the years studied. There was a slight positive correlation between mean yield of the assessed carrots and maximum temperatures in September (r = 0.44). Mean carrot yield was also somewhat negatively correlated with total rainfall in July (r = –0.43) and with number of days with rain in August (r = –0.43) and September (r = –0.44). Most onion cultivars showed stronger relationships between marketable yield and various weather patterns. Marketable yield of onions increased with an increase in the number of days with rainfall in June (r = 0.57). The mean marketable yield of the six onion cultivars decreased in relation to temperatures ≥30°C in June (r = –0.55) and August (r = –0.53). The mean yield of all the onions in the trials was negatively correlated (r = –0.78) with growing degree days (base 5°C, May to August). The results indicated that the data from long-term cultivar trials can be used to identify cultivars that yield well despite seasonal variations in weather. Key words: Daucus carota, Allium cepa, temperature, rainfall

scholarly journals Water stress can induce quiescence in newly‐germinated onion (Allium cepa L.) seedlings

2001 ◽  
Vol 52 (358) ◽  
pp. 1129-1133 ◽  
Author(s):  
W.R. Whalley ◽  
J. Lipiec ◽  
W.E. Finch‐Savage ◽  
R.E. Cope ◽  
L.J. Clark ◽  
...  
Keyword(s):  
Water Stress ◽  
Allium Cepa ◽  
Allium Cepa L

scholarly journals Efeito de espécies vegetais em bordadura em cebola sobre a densidade populacional de tripes e sirfídeos predadores

2003 ◽  
Vol 21 (4) ◽  
pp. 731-733 ◽  
Author(s):  
Paulo Antonio de Souza Gonçalves ◽  
Carlos Roberto Sousa e Silva
Keyword(s):  
Zea Mays ◽  
Daucus Carota ◽  
Raphanus Sativus ◽  
Zea Mays L ◽  
Thrips Tabaci ◽  
Eruca Sativa ◽  
Daucus Carota L ◽  
Allium Cepa L ◽  
Raphanus Sativus L ◽  
Fagopyrum Esculentum Moench

Analisou-se a relação entre o efeito do plantio de diferentes espécies vegetais, em bordadura, na cultura da cebola, Allium cepa L, na incidência de Thrips tabaci Lind. e sirfídeos predadores, Toxomerus spp. O experimento foi conduzido na Epagri, EE de Ituporanga, de agosto a dezembro de 1998. Os tratamentos foram cebola em monocultivo; cebola + trigo mourisco (Fagopyrum esculentum Moench); cebola + nabo forrageiro (Raphanus sativus L. var. oleiferus Metzg.); cebola + cenoura (Daucus carota L., cv. Nantes e cv. Brasília); cebola + milho (Zea mays L.); cebola + rúcula (Eruca sativa L.) + vegetação espontânea. O plantio de diferentes espécies vegetais em bordadura não provocou diferenças significativas na incidência de tripes e sirfídeos predadores. A produtividade comercial de bulbos de cebola foi similar em sistema de monocultivo e diversificado, sugerindo ser possível adotar tais sistemas sem perdas em rendimento.

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