الفهرس 
Material and methodsOnly 14 pages are availabe for public view
 |  | from | 116 |  |  |
| | | from | 116 | | |
Abstract
Five field experiments were carried out at the Experimental
Farm of of the Faculty of Agriculture at Moshtohor , zagazig UniversLt
y Benha,Branch during the seasons of 1980 - 1981 t 1981 - 1982 and
1982 - 1983 •
The aim of this study was to evaluate some onion cultivars
under the conditions of Kalubia province I the response of Giza 20 cultivarto N • P t K , Cu t Zn and Mn fertilizations as well as GA3 t NAA ,
Alar and Ethere1 foliar spray. Moreover, the residual effect of such
growth regulators on the subsequent seed yield capacity was also taken
in consideration •
The first experiment was conducted to study the performance of
five cultivars i.e t Behairy [local strain from Kalubia province]
Giza 20 [new cultivar for Delta and Middle Egypt] t Giza 6 Mohassan
[Improved Giza 6] I Shandweel 1 [New cultivar for Upper and Middle ~t]
and Texas Yellow Grano 50 s [American cultivar] with respect to yield
components and its quality t chemical constituents and keeping quality
of onion bulbs •
The second experiment included 12 treatments i.e , 30 t 60 and
90 kg N Ifed. in combination with 30 and 60 Kg P20S I fed. and ° and
48 kg K20 I fed. It was conducted to study the effect of such treatments
on yield and quality as well as storageability of onion bulbs of
Giza 20 cultivar •
The third experiment was conducted to study the effect of some
micronutrients i.e t copper • zinc and manganese foliar spray each at
two concentration t either as single or in combinations with each
other on the previously mentioned characteristics of onion bulbs of
Giza 20 cuItivar •
The effect of foliar spray of each of GA3 ’ Alar t NAA or Etherel
(each at two concentrations) on yield , quality and storageability
of Giza 20 onion bulbs was the aim of the fourth experiment •
The fifth experiment was conducted to study the residual effect
of the different used growth regulators treatments of the fourth experiment
on the seed yield capacity of the mother bulbs
The most important results obtained from these experiments are
as follows :-
1. The highest percentage of bolters was accompanied with the
variety Texas Yellow Grano t while that of doubles was in the varieties
Behairy and Shandweel l. With regard to firminess , Giza 20 and Shandweel
1 Cvs , showed the highest values , followed by Behairy and
Giza 6 Mohassan. Texas Yellow Grano came last in this respect • Highest
bulb yield productivity was obtained by Texas Yellow Grano , followed
by Giza 20 and then Behairy •
2. Bulbs of Cvs Giza 20 and Behairy contained the highest percentages
of T.s.s t dry matter t N and total carbohydrates. Texas
Yellow Grano ranked last in this regard •
3. It is advisable to alitivat Giza 20 cultivar under similar
conditions of Kalubia to overcome the problem of lacking onion on markets
, thus bulbs of Giza 20 cv proved to be of the best keeping quality
followed by Behairy t Giza 6 , Shandweel 1, meanwhile Texas Yellow
Grano was the worst ~ in storageability •
!. Fertilization treatments had no significant effects on percentages
of either bolters or doubles of Giza ZO cultivar •
5. Application of 60 + 30 + 48 kg /Eed • of N + PZOS + KzOt
respectively may be recommended to produce highest bulb yield with the
best physical and chemical characters as well as highest storageability.
~. It is not advisable to spray onion plant of Giza 20 cultivar
with used microelements i.e ; Cu t Zn and Mn t Thus it did not increase
either bulb yield or improve bulb quality or storageability •
1. Repeating foliar spray of onion plants of Giza 20 cultivar
for four times with either GA3 t Alar t NAA or Etherel decreased percentages
of bolters , increased Nand P percentages and improved marketable
and total yield than control. 100 - 200 ppm NAN or SO - 100 ppm
Etherel proved to be the best treatments in this respect. However it
increased percentage of doubles and had no effect on T.s.s • dry weight,
K and total carbohydrates percentages •
8. It is advisable to spray onion plants during growth season
with 50 _ 100 ppm Etherel as a mean of decreasing the weight loss during
storage , which may lead to improving storageability of stored bulbs.
9. With regard to the residual effect of growth regulators used
on the produced mother bulbs, it has been found to improve the scaps
formation and consequently increased seed yield productivity. Using ei~
GA
,Alar, NAA or Ethere! at concentrations of 100 • 500 ,200 or
100 t respectively as foliar spray on onion plants proved to be among
the best treatments in this respect •