Document Type : Research articles.
Author
Sugar crop Res. Inst., Agric. Res. Center, Giza, Egypt.
Abstract
Two field experiments were conducted at El-Sirw Agricultural
Research Station, Damietta Governorate (latitude of 31.140 N and
longitude of 31.390 E) during the two seasons 2011/2012 and 2012/2013
to investigate the effect of different sources of nitrogen and zinc levels
on growth, yield and quality of sugar beet crop (Beta vulgaris var.
saccharifera, L.) grown in saline soil conditions. The present work
included eighteen treatments, which were the combinations of six
nitrogen source including the sole application of urea (46.5% N),
ammonium nitrate (33.5% N), ammonium sulfate (20.6 % N and 24
S%); combined application of 50:50% of urea and ammonium nitrate
and 50:50% of urea and ammonium sulphate as well as 50:50% of
ammonium nitrate and ammonium sulphate, in addition to three foliar
applications of zinc (without zinc, control), 1000 and 2000 ppm as zinc
sulphate (22% zinc).
The obtained results showed that fertilizing sugar beet using the
sole application of ammonium nitrate and mixture of ammonium nitrate
+ ammonium sulphate at ratio of 50:50 as nitrogen source produced
significant higher root length, diameter, top, root fresh weight,
sucrose%, quality %, calcium, magnesium, nitrogen, phosphorus, zinc
contents in leaves and zinc uptake in roots as well as root, top and sugar
yields/fed compared with that recorded by the other N sources.
Results showed that higher values of root length, diameter, root and
top fresh weight/plant, root, top and sugar yields/fed, sucrose% and zinc
concentration in root and leaves (ppm) were obtained with increasing
foliar zinc application up to 2000 ppm.
The interactions among nitrogen sources and zinc levels
significantly affected root, top fresh weight/plant and root yield/fed,
where the mixture of ammonium nitrate + ammonium sulphate at ratio
of 50:50 in addition to 2000 ppm zinc as foliar application gave the
highest value of root, top fresh weight/plant and root yield/fed in both
seasons compared with the other nitrogen sources.
Keywords
Main Subjects
)
View on SCiNiTO