b o ‘lgan N , P, К o ‘g ‘itlari b o ‘lib, bilvosita t a ’sir e t u vc h i o ‘g ‘itlar
o z u q a m o d d a s i g a ega b o ‘l m a y , h o s i l d o r l i k n i o s h i r i s h d a i s h t ir o k
et adilar . U l a r t u p r o q n i n g xususi yat ini y a x s hi l a s h d a ishtir ok etishi
m u m k i n . M a s a l a n o h a k . A g a r t u p r o q n o r d o n b o ‘lsa, o h a k b i lan
t u p r o q i sh l an sa n o r d o nl i g i k a m a y i b ne y tr a l h o l a t g a kelishi m u m k i n .
H o s il d or l i k ni oshi ri sh b il an b i r q a t o r d a m a h s u l o t n i y ig‘ish d a v ri-
g a c h a saql ash, kasalliklar, turli z a r a r k u n a n d a l a r bi lan k ur a s his h h a m
kat ta a h a mi y a t ga ega. Bu m a q s a d d a q i s hl oq x o ‘jal igida turli kimyoviy
m a h s u l o t l a r d a n f oyda la ni la di.
0 ‘si mli k kasalliklari va zararli h a s h a r o t l a r b i l a n k ur a s hi sh u c h u n
ishlatiladigan ki myoviy m o d d a l a r
pestitsicllar f o b
at aladi. H a s h a r o t l a r
b il an k u r a s h u v c h i m o d d a l a r n i
insektitsicllar,
turl i kasa l l ikl ar bilan
k u ra s h u v c h i m o d d a l a r n i es a
fu n g itsid la r
d e b at al adi.
0 ‘s i m l i k l a r n i n g rivojlanishi, o ‘sish j a r a y o n i n i t ezlat ish m a q s a d i -
da oxirgi d a v r d a
stim ulyator
n o m i b i lan a t a l a d i g a n p r e p a r a t l a r d a n
f o y d a l a n i l a d i . Y o v v o y i o ‘s i m l i k l a r b i l a n k u r a s h u v c h i k i m y o v i y
m o d d a l a r n i
gerbitsidlar
d e b a t a l a d i , o ' s i m l i k l a r b ar gini t u s h u r i s h
u c h u n q o ‘l la n i l a d i g a n m o d d a l a r n i
defoliantlar
d e b ataladi.
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