الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
SUMMARY AN
This study included two xp riments which were carried out in
ea h of the summer and winte s asons of 1996 and 1997 at the
Ch psy Company Farm in S area, Ismaalia governorate and
La oratory of Horticulture Dep e ent at the Faculty of Agriculture
Mo hotohor, Zagazig University.
ONCLUSSION
T EXPERIMENT:
The first experiment was s g ested as an attempt to investigate
the effect of three levels of ,P and K fertilizers within seven
intr duced potato cultivars as we I their combination on vegetative
h, yield and its components, ch mical composition of both plant
e and tuber and suitability f r c ipsy processing after harvesting
and after 3· months storage . Th ed rates of nitrogen, phosphorus
otassium (NPK) fertilizers w re as follows:
1-(1 OkgN + 60 kg P20S + 100 kg 2 / fad.)
2-(1 5 kg N + 75kg P20S + 150 kg 2 Ifad.)
3-(2 0 kg N+ 90 kg P205 + 200 kg 2 I fad.)
onus i.e., Ammonium sulphate
(20.5 oN), Urea (46.5 % N) and monium nitrate (33.5 % N),
phos horus as calcium superphos ha e (15.5%P20S) and potassium
was a ded in the form of potassium ul hate (48-52 %K20).
The phosphorus fertilizer w dded as one bush to the soil
befor planiting, Meanwhile, nitro e and potassium fertilizer were
a ded in different portions, s01fe was added as soil application in two
e ual portions (before plantin, and before ridging) and other parts
w re applied with irrigation water throughout the growing seasons in
equal portions starting 21 dfs up to 60 days after planting.
The studied cultivars of potato were seven. i.e., Lady Rosetta,
A cent, Karlena, Sponta, Mirakel, Turbo and Accord in the summer
winter seasons of 1996, seven cultivars in the summer and winter Ii
ons of 1997 were tested bpt they were Lady Rosetta, Saturna,
lena, Cycloon, Mirakel, ~urbo and Accord. Split plots in a
omized complete bloks design with four replicates was used. The
cuI ivars were distributed in the main plots whereas the fertilization
lev Is were randunly situated in ~e sub plots.
The obtained results can b, summarized asfollows:
I-p ant vegetative growth: Sifificant differences were observed
among cultivars in vegetative growth characteristies viz plant
height, number of branche and fresh and dry weights per plant.
In this respect, Sponta, Cyc oon, Karlena, Turbo and Saturna. In
combination with the third d level ofNPK (200kg N + 90 kg
P20S + 200 kg K20 / fad.) sassed other used combinations.
2-C emical composition of pia foliage: The cvs. Saturna, Accent,
Mirakel, Turbo, Cycloon d Accord in combination with the
third·,8.JtP1ied level ofNPK fertilizer showed the highest values
of N,P ,.K. and total hydrates percentage than other
combinations.
ield and its components: U’he cvs. Lady Rosetta, Saturna and
Turbo in combination ~ith the second and third tested level of
NPK fertilizers gave hi~er number of tubers per plant. While,
cvs. Sponta and Cycoloon in combination with the second level
of NPK fertilizer gave ~ higher average of tuber weight than
other combinations. The Icvs. Lady Rosetta, Saturna, Karlena
and Sponta in combination with the third used level ofNPK
gave higher tuber weight per plant compared with ether
I treatments. Moreover, cvs, LadyRosetta, Satuma and Karlena
in combination with the t~ird applied level of Nl’Kfertilizer.cv,
Sponta with the second ~ne and cv. Mirakel withthefirst one
showed higher tuber yiel per faddan than all other cultivars in
the different used comb ations Concerning the marketable
yield per fad. the cvs. La y Rosetta, Saturna and Karlena with
the third level of NPK 4d cv. Sponta with the second one
resulted in the highest values of marketable yield per fad., while
cvs. Mirakel and Turbo wi h first level ofNPK or cvs. Cycloon
and Turbo with the used one showed lower
unmarketable yield percen ge.
4-S, e of tubers:The cv. Mirak in combination with the first tested
level ’of NPK fertilizer d cvs. Sponta and Cycloon in
combination with the seco d and third applied levels of NPK
fertilzer showed higher ues of Large size tubers (> 55mm.)
yield and percentage. Ho ever, cvs. Lady Rosetta, Saturna,
Karlena and Accord in co bination with the third tested level
of NPK gave higher yield and percentage of medium tubers (35-
55mm.). Meanwhile cv.ILady Rosetta with the first level of
I
NPK and .both cvs. Satufna and Turbo in combination with
«35mm.) the third levellofNPK fertilizer showed the highest
values of small size tubers land its percentage.
S- ’hemical composition 0/ tu~ers be/ore storage: The cvs. Sponta
and Turbo in combination rith the third applied levelofNPK
fertilizer showed higher values of (N,P,K, No3 and protein),
while, cvs. Accent and Turbo in combination with the third used
i
level of NPK fertilizer gav~ a higher value of total amino acids
content Moreover, both cvs.1 Accord and Mirakel with the same
level of NPK fertilizers showed the highest values in reducing,
on reducing and total sugars content of potato tubers. However,
vs. Lady Rosetta, Saturna 4d Karlena showed the lowest values
n sugars content, that make it the most suitable for processing
urpose.
The cvs. dy Rosetta, Saturna and Karlena
showed higher values of co king quality characters (dry matter,
colour, Taste and crispy) than other used caltivars.
after storage: The cvs. Sponta and
the third applied level of NPK
hawed higher values ofN d protein content of tuber. The cvs.
ady Rosetta and Turbo in combination with the third level of
K showed higher values fP,K and NO], while, cvs. Accent
d Mirakel with the same evel of NPK fertilizer showed a
and Satuma in combination with bed system, and cv. Sponta in
combination with ridging system all spaced at 30cm.showed
higher significant values than other cultivars.
2- ”eld and its components: Both cvs. Mirakel and Saturna in
combination with ridging system or cvs. Accent and Satuma in
combination with bed system and all spaced at 30cm showed
higher values of number of tubers per plant. Moreover, cvs.
Sponta planted either on ridge or on bed system and Cycloon in
bed system and all of them were spaced at 30cm showed higher
values of average tuber weight.
Respecting tubers yield per plant, cvs. Sponta and Cycloon in
bination with ridging system and spacing at 30cm gave the
hi erst tuber weight per plant. Concerning total yield per feddan, CV,
Sp nta in combination with ridging method and spacing at 20 or
a part, cv. Accent planted in ridging system and spaced at 20cm
and both cvs. Saturna and Karlena in combination with bed system
and spacing at 20cm showed the highest values of total yield per
fad than other used combinations. Regerding marketable yield,
cvs. Accent and sponta in combination with ridging system and
spa ed at 20 or 30cm apart andlcv. Satuma in combination with bed
I
syst m and spacing at 30cm ga/ve the hgihest values of marketable
yiel per fad., Meanwhile, cvs.1Karlena, Saturna, Sponta, Mirakel,
Tur 0 and Accord in combin~tion with ridging system and hill
spa ing at 30cm showed the lo~est values of unmarketable yield
Per ntage.
3- uber size: Both cvs. Sponta and Cycloon in combination with
ridging or bed system and spaced at 30cm showed the highest
values of Large size tubers percentage. While, cvs. Lady Rosetta
in combination with ridging or bed system, Saturna with ridging
and Karlena with bed system and all spaced at 20cm gave the
highest values of meduim ~ze tuber pecentage. Moreover, cvs.
i
Accent, Karlena, Turbo, saturna and Accord in combination with
< either bed or ridging system and spaced at 20cm gave higher
I
values of small size tuber percentage,
Generally, it may be concluded that planting the cvs. Lady
Ro etta, Saturna and Karlena and supplied with the highest used level
,
of K fertilizer (200kg N + 90kg P20 + 200kg K20 /fad.), cv.
Sp nta with the second tested leivel (150 kg N + 75 kg P20s + 150 kg
K2 I fad.) and cv. Mirakel with the first one (150 kg N + 60 kg P20s
+1 Okg K20 I fad.) may be recommended for the highest marketable
and total yields per fad. and for good quality of potatoes for
pro essing (chipsy). The cultivars Lady Rosetta, Saturna and Karlena
wh.ch showed the lowest values i~ sugars content and high percentage
matter content of tubers, ate considered as the most suitable for
pro essing specially that they showed a good storageability for the
coo ing quality when stored in cold storage at lOCOfor 90 days.
It may be also concluded th,t planting cvs. Sponta and Accent in
rid . g system (90cm) and spacfng at 20 or 30cm between plants and
pi ting also cvs. Saturna and ~lena in bed system (l80cm) and
sp cing at 20cm between plants;produced the highest marketable and
tot I yield per fad.
For obtaining the highest percentage of large size tubers the cvs.
and Cycloon when planted on ridging or bed system and
at 30cm between plants are recommended. Morover, for
ge ing medium tubers cv. Lady Rosetta planted on ridging or bed
sys em and spaced at 20cm cvs. Saturna and Karlena with ridging
sys em and spacing at 20cm between plants. Moreover, cvs. Accord,
ena, Satuma when grown on beds or ridge and spaced at 20cm
produced the highest values of percentage of small sized tubers
whi h are recommended for using as seeds