Group Title: Ft. Pierce AREC
Title: First-year response of 'Ruby Red' grapefruit on four rootstocks to fertilization and microirrigation salinity level
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Permanent Link: http://ufdc.ufl.edu/UF00055959/00001
 Material Information
Title: First-year response of 'Ruby Red' grapefruit on four rootstocks to fertilization and microirrigation salinity level
Series Title: Ft. Pierce AREC
Physical Description: 2 leaves : ill. ; 28 cm.
Language: English
Creator: Sonoda, Ronald M
Agricultural Research and Education Center (Fort Pierce, Fla.)
Publisher: University of Florida, Insititute of Food and Agricultural Sciences, Agricultural Research and Education Center
Place of Publication: Fort Pierce Fla
Publication Date: 1993]
 Subjects
Subject: Grapefruit -- Irrigation -- Florida   ( lcsh )
Soils, Salts in -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Brian J. Boman.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00055959
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 66899403

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S FIRST-YEAR RESPONSE OF 'RUBY RED' GRAPEFRUIT ON FOUR ROOTSTOVR 2 0 -o
0 ^-7 TO FERTILIZATION AND MICROIRRIGATION SALINITY LEVEL
Brian J. Boman '' ; f Forirl;

Young 'Ruby Red' grapefruit trees on sour orange, Carrizo citrange,
Cleopatra mandarin, or Swingle citrumelo rootstocks were used in a
randomized split plot field experiment with 4 replications. Irrigation
water had electrical conductivities of 0.7, 2.3, 3.9, or 5.5 dS m-1 (500,
1600, 2700, or 3800 ppm TDS). Fertilization applications included:
fertigating weekly with 6.3 g N tree-1 (FERT-H); fertigating weekly with
3.7 g N tree-1 (FERT-L); and broadcasting granular fertilizer at 6-week
intervals with 40 g N tree'1 per application (F-DRY). Total N and K
applied per tree during the first year was 0.15 lb for FERT-L, 0.26 lb for
FERT-H, and 0.44 lb for F-DRY.
Tree measurements were taken in June and December showed the 2.3,
3.9 and 5.5 dS m"1 salinity levels reduced tree canopy volumes 17Z, 28Z,
and 35Z compared to the 0.7 dS m- treatment. Leaf chloride concentration
ranged from 0.38Z for those trees irrigated with 0.7 dS m-1 water to 0.48Z,
0.69Z, and 0.99Z for the 2.3, 3.9, and 5.5 dS m-1 treatments. With an
average canopy volume change of 327Z, the trees on Cleopatra had the
largest increase during the study period; followed by increases of 292Z
for Swingle, 267% for Carrizo, and 147Z for sour orange.
Fertigations made on a weekly basis at the higher rate (FERT-H)
proved to enhance growth significantly more than the FERT-L or F-DRY
treatments. The FERT-L application rate of 0.15 lb tree- during the season
resulted in nearly a 50Z reduction in canopy volume as compared to the
FERT-H trees, indicating insufficient N for maximum growth. Fertigation
with the 6.3 g tree-1 of N per week rate (FERT-H) resulted in a 402
reduction from recommended dry application rates for N (F-DRY), yet trees
had superior growth for all irrigation salinity levels and rootstocks.



1.5- sM Carrizo
AAAA Cleopatra
MaE Sour
QQQD0 Swingle

0
o



0.5




0.5
0


-J

0.0 i -iI
0 1 2 3 4 5 6
Irrigation water salinity level (dS m- )

Fig. 1. Leaf Cl concentration by rootstock and water salinity level (4
leaves taken from each of the 16 trees per sample, fertilizer treatments
Slumped, n = 3).


Ft. Pierce.AREC 93-7











0.3

E 0.2


0
E 0.1

> 0.0


0
S0.3
o

S0.2

S0.1
0)
a 0.0


A

A
FERTILIZER TREATMENTS




A






ROOTSTOCKS
I I I-I I


0 1 2 3 4 5 6
Irrigation water salinity level (dS m~')


Fig. 2. December 1989 canopy volumes for fertilizer treatments by
salinity level (N-64) and for rootstocks by salinity level (N=48).





0.85 6
S FERT-H
F 0.30- F- Dy v
o SE FERT-L
o 0.265-
.0
S0.20
b b
0.15

So.10 b
0


0.00
Sour Swingle Carrlm Cleopatra

Fig. 3. December 1989 canopy volumes by fertilizer treatments for
rootstocks. Means within a rootstock followed by the same letter are not
significantly different (p=0.05) according to the Duncan's Multiple Range
Test.


Ft. Pierce AREC 93-7


,. a


tllt9 FERT-H
4AAAA FERT-L
MUM F-DRY








ttno Carrizo
4AAA4 Cleopatra
UI Sour
20.O Swingle


I




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