الفهرس 
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Abstract
Two field experiments were carried out during the two
seasons (2001/2002 and 2002/2003) at Abo Ders Farm
Elkasasen- lsmalia, to investigate the effect of K levels
(fertigation) in combination with foliar application as yeast
extract and micro nutrients (Fe+Mn+Zn).
K applied (Iertigation) as K2S04 (50% K20) K levels were
0, I00,200,300,400 kg K20/fed. Within five foliar application
treatments as follow:
1- control (sprayed with tap water)
2- 5 mUL Yeast extract.
3- 25 mUL Yeast extract.
4- 60 ppm Fe EDDHA + 30 ppm Mn EDTA +30 ppm Zn
EDTA.
5- 25 mLie Yeast extract + (mixture of micronutrients),
r
Foliar applications were applied periodically at 15 day intervals
starting from 2 weeks after transplanting until mid of May.
Each experimental plot included two ridges each of 120 em wide
and 50 em between ridges. Fresh transplants were grown at 4
rows. Each plot included 2 ridges of 3 m long and 170 cm width
and included 80 plants in 10.2 em’ area. •
Data were recorded on plot basis and included plant
growth characteristics after 240 days from planting, mineral
contents of leaves (N,P,K,Ca), number of flowers per plant, total
and early fruit yield and fruit quality parameters (total sugars,
reduced sugar, non reduced sugar, acidity, Vit. C and total
82 Summery and conclusion
soluble solids), total and early fruit yield were converted into per
fedden and per plot.
The important results were as follow:
I-Vegetative growth characteristics:
The number of formed leaves per plant was increased
with di fferent applied K levels. Increases of leaves number
reached its maximum with K at the rate of 300 kg I fed.
Foliar spray treatments also significantly increased leaves
number. It could be noticed that K drench treatment was more
effective than other foliar spray treatments regarding the formed
leaves number. Also) clearly it could be noticed that number of
crowns behaved. the same as the aspect of leaf numbers.
r As for fresh and dry weights I plant, both weights
significantly increased with different K levels and foliar spray
treatments. Maximum increase of both weights existed with 300
kg K1.01 Fed. with the mixture of micro nutrients when combined
with YE at 25 mt/I; followed by YE at 25 mt/t,
IIw N, P, K, Ca and crude protein contents: I
N, P, K, Ca and the calculated protein content in leaves
of strawberry are being positively affected by different
treatments. It was noticed that treatment of Fe + Mn +Zn + YE at
25 mUL is the most effective one when combined with any of
applied K levels.
83 Summery and conclusion
111-Flowering:
Using Potassium at 300 kg/fed. level was the most
effective level. ALso. the treatment of YEo at 25 mt/I; when
combined with 60 ppm Fe + 30 ppm Zn + 30 ppm Mn as foliar
spray gave the highest flower number that reached to 42.2 &
41 .73 flowers / plant comparing with 12.2 & 13.8 flowers / plant
for control treatment in the first and second seasons,
respe,ctively. •
The foliar spray with micronutrients mixture + YEo at 25
mUL when combined with K at 300 kg/fed. gave a great
effectiveness on flower number.
tv- Early fruit yield:
•
Separately applied K levels at 200,300 kg/fed. increased
the early fruit weight by about 16.71 and 21.16 % more than the
control value respectively during 2001/02 season.
On the other hand during 2001/02 season foliar spray
treatment is bing more effective in this respect since, value were
25.19. 49.96. 21.92 and 58.93 more than the control with 5
mf./L, 25 mUL, Fe + Mn + Zn and mixture of micronutrient +
25 mUL YEo respectively.
The two levels of 200 and 300 kg/fed. of K levels when
combined with different sprayed materials are bing more
effective in this respect.
84 Summery and conclusion
V- Total fruit yield:
The treatment of K separately increased fruiting ability of
strawberry parally to the applied levels up to 300 kg/fed. during
the two seasons since total fruit yield values were 10691.2
kg/fed. for control treatment rose to reach 12732.7, 15372.0 and
18807.7 kg/fed. With 100,200 and 300 kg/fed. respectively.
On the other .hand, significant increase in the weight of.
yielded strawberry fruits existed with 25 mt/I; YEo combined r
with micronutrient mixture, yet, YEo at 5 men. or 25 mt/t,
signi ficantly increased total yield of strawberry. Also, it could be
noticed that each of K at 200 kg/fed. Combined with Fe + Mn +
Zn + 25 mUL YEo and K at 300 kg/fed combined with the same
mixture of foliar spray material are bing the most effective of all
applied treatments. •
VI- Fruit quality:
VI-l Fruit weight:
Potassium at 300 kg/fed. gave the highest fruit weight
during the two season of the present study. Since, values of fruit
weight were 18.933 and 20.720 g / fruit during first and second
season respectively. Also, it interest to note that yeast extract
either at 5 or 25 mill. were the most effective foliar treatment
when compared either with control or the mixture of micro
nutrients, yet, when YEo at 25 mf’/L combined with the mixture
of micronutrients gave the highest fruit weight.
In addition the combination of foliar spray materials with
di fferent K levels cleared that signi ficant increase of weight
specially K level at 300 kg/fed. combined with mixture of
micronutrient and 25 InUe. followed by the same K level when
combined only with 25 mUL YEo
85 Summery and conclusion
VI-2 Chemical constituents of fruits:
Increase of total sugars was mainly due to the component
of reducing sugars on the account of non reducing sugars. Here it
could be noticed that K at 400 kg/fed. was the most effective in
the first season, meanwhile, K at 300 kg/fed. was>the most
pronounced level during the second season.
Also, it was found that, during first season, the increase of
total sugar was nearly the ¥me with different sprayed materials.
H~re YE: at 25 I~ (/ r, Wh~”.1~~.<~.eseitdher alone o.r in comb.inat~on
with micronutrtents mnture were the highest effective
treatments when compared ’Wfthother ones. ’
As for the titratable: acidity (%), vitamin C and total
soluble solids in the two season of the present study, all were
significantly increased with various applied K levels. The only
exception was that insignificant increase of titratable acidity
during both seasons existed with 100 kg/fed.K.
In addition, it was also noticed that in the two seasons
each of YE at 25 ml/L and Fe + Mn + Zn + 25 melt. YE.
treatments significantly increased vitamin C concentration.
Meanwhile, YEo at 5 mt/t, and the mixture of micro nutrient
(Fe + Mn + Zn) did not significantly increase it.