Status Ketersediaan Unsur Tembaga dan Sen serta Respon Padi terhadap Pupuk Tembaga dan Seng Pada Empat Lokasi Persawahan di Jawa Barat

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4/?~/f;

/

1920

_;05e;

STATUS

KETERSEDBAAM

UMSUW

TEMBAGA

DAB

SEMG

S E R T W

RESPON

PAD1

BERHADAP PUPLIIK

T E M B A G W

DAM

SEMG

P

ADA

EMPAT LOKASl PERSAW

AN

DS

JAWA

B A R A T

Oleh :

AHMAD SARAGI

A 22.1100

JURUSAN TANAH

FAKULTAS PERTANIAN

lNSTlTUT PERTANIAN BOGOR

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RI NGKASAN

AHUAD SARAGI. S t a t u s K e t e r s e d i a a n U n s u r T e m b a g a d a n S e n g

s e r t a R e s p o n P a d i T e r h a d a p P u p u k Tembaga d a n S e n g p a d a

E m p a t L o k a s i P e r s a w a h a n d i Jawa Barat ( D i b a w a h b i m b i n g a n I r . A b d u l R a c h i m , MS.).

U n t u k m e n c a p a i p r o d u k s i maksimum k e b u t u h a n u n s u r h a r a

b a g i t a n a m a n p a d i d i p e r l u k a n pemupukan y a n g s e i m b a n g

a n t a r a u n s u r h a r a rnakro d a n u n s u r h a r a m i k r o d a l a m t a n a h .

C a d a n g a n u n s u r h a r a m i k r o dalarn t a n a h s e m a k i n lama s e m a k i n

s e d i k i t k a r e n a t e r u s - m e n e r u s d i a m b i l t a n a m a n t a n p a

p r o s e p e n g e r n b a l i a n y a n g s e i m b a n g .

P e n e l i t l a n i n i b e r t u j u a n u n t u k m e n g e t a h u i r e s p o n

t a n a m a n p a d i t e r h a d a p p e m u p u k a n Cu d a n Z n , s e r t a k o n d i s i

k e t e r s e d i a a n Cu d a n Zn p a d a t a n a h P l a n o s o l K r a m a t w a t u ,

R e g o s o l C o k l a t S i n d a n g b a r a n g , A l u v i a l C o k l a t Reg01 d a n L a t o s o l C o k l a t K e m e r a h a n S u m e d a n g .

P e r l a k u a n y a n g d i b e r i k a n y a i t u p e m b e r i a n p u p u k CuO

d a n ZnO d e n g a n d o s i s 0 , 5 , 1 0 , 15, d a n 20 ppm p a d a n a s i n g - m a s i n g t a n a h d a n d i u k u r r e s p o n n y a d e n g a n p e r t u m b u h a n d a n

p r o d u k s i p a d i . S i f a t j e r a p a n u n s u r Cu d a n Zn d i d u g a

d e n g a n m e n g g u n a k a n p e r s a m a a n F r e u n d l i c h d a n L a n g m u i r .

B e n t u k s e n y a w a Cu d a n Zn y a n g p a l i n g b e r p e n g a r u h t e r h a d a p

k e t e r s e d i a a n Cu d a n Zn d a l a m t a n a h d i t e n t u k a n d e n g a n

a n a l i s a f r a k s i o n a s i .

P e n a m b a h a n u n s u r Cu p a d a t a n a h P l a n o s o l C o k l a t

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t a n a m a n , p r o d u k s i g a b a h d a n kandungan Cu j a r i n g a n . T i n g g i

t a n a m a n t u r u n d a r i 1 0 2 . 8 c m p a d a t a n a m a n k o n t r o l m e n j a d i

9 4 . 4 cm p a d a d o s i s 5 ppm Cu

.

P r o d u k s i g a b a h n a i k s e c a r a n y a t a d a r i 3 1 . 6 g / p o t p a d a t a n a m a n k o n t r o l m e n j a d i 4 4 . 3

g / p o t p a d a d o s i s 5 ppm Cu. Kandungan Cu j a r i n g a n t a n a m a n t u r u n s e c a r a n y a t a d a r i 6 . 7 ppm p a d a t a n a m a n k o n t r o l

m e n j a d i 4 . 8 ppm p a d a d o s i s 5 ppm Cu. S e d a n g k a n p a d a t a n a h

R e g o s o l S i n d a n g b a r a n g , A l u v i a l C o k l a t R e g o l , d a n L a t o s o l

C o k l a t Kemerahan Sumedang r e s p o n t a n a m a n t e r h a d a p

p e m b e r i a n Cu t i d a k n y a t a s e c a r a s t a t i s t i k .

B a t a s k r i t i s t e r e n d a h , d i m a n a k o n s e n t r a s i Cu m u l a i

m e n g u r a n g i p r o d u k s i s e c a r a n y a t a , d i p s r o l e h s e b e s a r 3 _ppm.

Kandungan Cu t e r s e d i a R e g o s o l S i n d a n g b a r a n g d a n L a t o s o l

C o k l a t Kemerahan Sumedang s u d a h b e r a d a d i a m b a n g t i t i k

k r i t i s . Penambahan u n s u r Zn k e d a l a n t a n a h - t a n a h y a n g

d i t e l i t i t i d a k b e r p e n g a r u h n y a t a t e r h a d a p p e r t u m b u h a n

walaupun d a r i d i a g n o s i s kandungan Zn d a l a m j a r i n g a n

t a n a m a n t e r s e b u t m a s i h k e k u r a n g a n u n s u r Z n .

S i f a t j e r a p a n Cu d a n Zn b e r b e d a - b e d a p a d a s e t i a p

j e n i s t a n a h y a n g d i a m a t i , namun t e r d a p a t s u a t u p o l a y a n g

s a m a . J e r a p a n Cu p a d a t a n a h y a n g d i t e l i t i t e r d i r i d a r i

d u a t a p a k , k e c u a l i p a d a R e g o s o l S i n d a n g b a r a n g t e r d i r i d a r i

t i g a t a p a k j e r a p a n . J e r a p a n Zn p a d a k e e m p a t t a n a h y a n g

d i a m a t i t e r d i r i d a r i t i g a t a p a k j e r a p a n .

Tanah m e n j e r a p u n s u r Cu d e n g a n k a p a s i t a s j e r a p y a n g

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1577 umo1/100 gram t a n a h p a d a P l a n o s o l C o k l a t K e k e l a b u a n

K r a m a t w a t u . P a d a t a n a h R e g o s o l C o k l a t S i n d a n g b a r a n g ,

A l u v i a l C o k l a t R e g o l , d a n L a t o s o l C o k l a t Kemerahan

Sumedang m e n j e r a p k u a t m a s i n g - m a s i n g h i n g g a 4 4 7 , 1 5 5 7 , d a n

616 umo1/100 g t a n a h . S e d a n g k a n u n s u r Zn d i j e r a p k u a t

h a n y a s a m p a i p a d a 4 9 4 , 7 8 , 4 5 4 , d a n 4 0 6 umo1/100 g m a s i n g -

m a s i n g u n t u k t a n a h P l a n o s o l C o k l a t K e k e l a b u a n K r a m a t w a t u ,

R e g o s o l C o k l a t S i n d a n g b a r a n g , A l u v i a l C o k l a t R e g o l d a n

L a t o s o l C o k l a t Kemerahan Sumedang. Dari b e r b a g a i b e n t u k

s e n y a w a Cu d a n Zn d a l a m t a n a h , f r a k s i y a n g p a l i n g

b e r k o r e l a s i d e n g a n C u - t e r s e d i a a d a l a h Cu t e r i k a t F e - o k s i d a

ainorf ( r - p a r s i a l

=

0 . 7 7 5 5 * * ) , f r a k s i Zn y a n g b e r k o r e l a s i

d e n g a n Z n - t e r s e d i a a d a l a h Zn t e r i k a t Mn-oksida ( r - p a r s i a l

(5)

STATUS KETERSEDIAAN U N S U R TEUBAGA DAN SENG SERTA RESPON PAD1 TERHADAP PUPUK TEHBAGA DAN SENG

PADA EUPAT LOKASI PERSAWAHAN D I JAWA BARAT

O l e h :

AHUAD SARAGI A 22 1100

L a p o r a n p e n e l a a h a n n a s a l a h k h u s u s s e b a g a i s a l a h s a t u

syarat u n t u k n e n p e r o l e h gelar S a r j a n a P e r t a n i a n p a d a

F a k u l t a s P e r t a n i a n , I n s t i t u t P e r t a n i a n B o g o r

JURUSAN TANAH

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4/?~/f;

/

1920

_;05e;

STATUS

KETERSEDBAAM

UMSUW

TEMBAGA

DAB

SEMG

S E R T W

RESPON

PAD1

BERHADAP PUPLIIK

T E M B A G W

DAM

SEMG

P

ADA

EMPAT LOKASl PERSAW

AN

DS

JAWA

B A R A T

Oleh :

AHMAD SARAGI

A 22.1100

JURUSAN TANAH

FAKULTAS PERTANIAN

lNSTlTUT PERTANIAN BOGOR

(123)