Asian Journal of Crop Science1994-78792077-2041Asian Network for Scientific Information10.3923/ajcs.2009.49.57Beta vulgaris L.) Under Controlled Climatical Conditions]]>YadollahiA. Shojaei AsadiyehZ. 1200911This research was conducted to investigate the impact of night temperature and light intensity on growth indices and sugar content of sugar beet (Triploid Multigerm Iran-Karaj 1 variety, type N-E) in a Mediterranean climate (North West of Iran) at Moghan Agro-industry and Livestock Co.
from April 2001 to February 2002. Its lower sugar contents were reported
than those normally grown in other sugar beet growing regions. Sugar beet
crops were cultivated with full automatic controlled environment (night
temperature and light intensity) facilities in an experimental farm. Data
were collected 80 days after planting using a completely randomized block
design with four replications using 7 treatments. The treatments consisted
of night temperature 15°C (T1) and 10°C (T2),
increase of light intensity (L), night temperature 15°C and increase
of light intensity (T1L), night temperature 10°C and increase
of light intensity (T2L), a greenhouse control (C1)
and a control without greenhouse (C2). The total dry matter
and leaves area of sugar beet were measured to calculate the growth indices
including shoot crop growth rate, total crop growth rate, leaf area index
and net assimilation rate from 20 days after planting. After 140 days,
some samples were taken from the roots of sugar beet and pulp in order
to determine the sugar content. This sampling procedure was carried out
every 10 days up to 210 days after planting. Model development showed
that the best equation, Y = aebx (Y is the sugar content, e,
the napery logarithm, a and b are coefficient and x is one of the growth
indices), was obtained from data regression. The growth indices were negatively
correlated well (p<0.001) with sugar content. Hence, the low sugar
content could be due to the warm nights and slight light intensity during
days.]]>Abdollahian-Noghabi, M. and R.J. Froud-Williams,19981326869Bedell, J.P., A. Briant, C. Delolme, L. Lassabatere and Y. Perrodin,20066213111323Clover, G.R.G., K.W. Jeggard, H.G. Smith and S.N. Azam Ali,2001136169178Durr, C. and G. Boiffin,1995124427435Fabeiro, C., F.M. de Santa Olalla, R. Lopez and A. Dominguez,2003Beta vulgaris L.) cultivated under controlled deficit irrigation conditions in a semi-arid climate.]]>62215227Freeckleton, R.P., A.R. Watkinson, D.J. Webb and T.H. Thomas,1999933951Javaheri, M.A., A. Zinaldini and H. Najafi,2004625863Jones, P.D., K.W. Jeggard and J.D. Pidgeon,2003Beta vulgaris L.) in Europe.]]>5893108Kenter, C. and C.M. Hoffmann,2006Beta vulgaris L.).]]>866270Kenter, C., C.M. Hoffmann and B. Märländer,2006Beta vulgaris L.).]]>246269Method GS6-3,19941994Miyazawa, K., H. Suji, M. Yamagata, H. Nakano and T. Nakamato,200477787Qi, A., C. Kenter, C. Hoffmann and K.W. Jeggard,200523108122Rafiei, M.,19951995Ritcher, G.M., K.W. Jeggard, R.A.C. Mitchell,20011091325Scott, R.K. and K.W. Jaggard,19931993pp: 179-237pp: 179-237Scott, R.K. and K.W. Jeggard,2000134341352Sivakumar, M.V.K.,200633317Tsukada, M. and S. Takada,19881988pp: 6872Ulrich, A.,1952446673Ulrich, A.,19611961Werker, A.R. and K.W. Jaggard,199889229240Yadollahi, A.,19981998