The research was conducted on hybrid Squash (Nancy F1) at Tishreen University in
the growing season of spring 2013 in order to study the effect of ground covering and low
tunnels on the early production of squash. The study consisted of four experi
mental
treatments: the control (without covering) and three covering treatments (ground covering
using black mulch, ground covering with a low plastic tunnel, and a low plastic tunnel
without ground covering). The completely randomized design was used with three
replications per treatment and ten plants per replication. The results showed that the
covering with a low plastic tunnel was superior to other treatments, resulting in a clear
increase in female flowers, the ratio of female flowers to the total flowers, fruit number,
and plant production. The results also showed a strong positive correlation between the
plant production and the number of female flowers (r=0.999), the number of fruit per plant
(r=0.999), the ratio of female flowers to the total flowers (r=0.990) and the total number of
flowers (0.995). The correlation with male flowers was however negative (r=-0.954).
This study was conducted at the vegetable field of department of
horticulture and landscape design, college of agriculture and forestry ,Mosul
university, during spring of 2007 and 2008, to study the effect of times and
levels of nitrogen fertiliz
ation on some characters vegetative growth, flowering
,and yield of summer squash .Result indicated that, the time of nitrogen
fertilization at the stage of fruit-set caused a significant increased in the leaf
number /plant ,length of the plant and the fresh weight/plant. While the time of
nitrogen fertilization wasn't affected significantly the total yield. The level at
320 kg.N/ha caused a significant increase of the characters vegetative growth
and total yield. Also result revealed that, the interaction between the stage at
fruit set and nitrogen fertilization at 320 kg.N/ha led to increase the total yield
.The yield was found to positively correlation with the plant length ,fresh and
dry weights of plant, leaf area, fruit weight, male and female flowers, and the
sex ratio.
In this research, nine inbreed lines of squash (Cucurbita pepo, L) have been
studied during 2007-2008 seasons. The study contains plant phonological
phases, and the most important morphological and productivity characteristics
related to fruit yie
ld to evaluate the characteristics of every line and identify the
economical lines to use it in the breeding programs. The study showed genetic
variation between the groups for some important economic characteristics as
(the number of fruits per plant, percentage of female flowers, yield per plant,
stem long and number of nodes till the first female flower). The study also
showed that the inbreed lines of squash is a rich source of variation and can be
use in a breeding program to product squash hybrid. The results appeared also
the positive correlation between the productivity and some important economic
characteristics, such as percentage of female flowers (r=0.871**), the number of
fruits per plant (r=0.976**). Whereas negative correlation with the nodes till he
first female flower (r=- 0.494) and internodes long (r=- 0.447). Using cluster
analysis, the inbreed lines were classified into 2 distinct classes A and B, Class
A contained seven inbreed wreathe class B contained Tow inbreed lines.