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Rice performance trials
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Permanent Link: http://ufdc.ufl.edu/UF00054450/00001
 Material Information
Title: Rice performance trials
Series Title: 1984- Belle Glade research report
Physical Description: v. : ; 28 cm.
Language: English
Creator: Agricultural Research and Education Center (Belle Glade)
Belle Glade AREC
Publisher: Agricultural Research and Education Center.
Place of Publication: Belle Glade Fla
Creation Date: 1988
Frequency: annual
regular
 Subjects
Subjects / Keywords: Rice -- Varieties -- Field experiments -- Periodicals -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
serial   ( sobekcm )
 Notes
General Note: Description based on: 1982; title from caption.
General Note: Latest issue consulted: 1984?
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 40942357
lccn - 2007229086
System ID: UF00054450:00001

Table of Contents
    Copyright
        Copyright
    Introduction
        Page 1
        Page 2
    Procedures
        Page 3
    Results
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
    Summary
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
    Tables
        Page 13
        Page 14
        Page 15
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
Full Text





HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida





00

EES
Belle Glade Research Report EV-1988-4 December, 1988




1988 Rice Performance Trials



David B. Jones, Rice Agronomist

IFAS__Everglades Research and Education Center
Central Science Belle Glade, Flori a 33430
Library

lPY 31 1989

University of Florida
*W--* "1-- -- -.I-i, --!-,.-Vra--1-n-p ~
Rice performance trials were conducted at three locations in

the Everglades Agricultural Area (EAA) in 1988. The trials were

grown at the following locations: Everglades Agricultural

Research and Education Center (EREC), 3 miles east of Belle

Glade; Harley-Watson Farms (HWF), 2 miles west of Lake Harbor;

and El Rodeo Investment Corporation, State Land Farm (SL), 8

miles south of Lake Harbor.

A total of 22 cultivars were evaluated in 1988. Cultivars

were divided into maturity groups, very-early and early-

midseason, but were grown within the same test area at all

locations. A general description of the very-early season (VE)

cultivars tested in 1988 is given in Table 1. The VE group

consisted of three tall, two intermediate and seven semi-dwarf or

short statured plant types; all cultivars were very-early

maturity except Skybonnet which is intermediate in maturity of









the two maturity (VE and early-midseason) classifications; two

cultivars were medium grains and 10 were long grains; the

cultivars originated from various private and public breeding

programs; five were experimental hybrids and two were advanced

experimental lines being evaluated for release as cultivars, the

rest of the entries were commercially available cultivars.

A general description of the early-midseason (EM) cultivars

tested in 1988 is given in Table 2. The EM group consisted of

seven tall, four intermediate and seven semi-dwarf or short

statured plant types; four cultivars were early maturity, 11 were

midseason and three were late or full season maturity; four

cultivars were medium grains and 14 were long grains; as in the

VE group, the cultivars originated from various private and

public breeding programs; three were experimental hybrids, two

were advanced experimental lines and the rest of the entries were

private or public cultivars.

Mean monthly temperatures were very close to long-term

average temperatures for the 1988 rice growing season in the EAA,

appendix Table 1. Rainfall, however, for the 1988 season was

only 61% of the long term average and only in July and August was

it above the average. Therefore, because of the dry weather,

planting operations occurred on a timely basis and stand

establishment was, in general, quite good. The low cloud cover

during the main part of the growing season led to relatively good

yields throughout the EAA, but harvesting was delayed due to the

high rainfall in July and, particularly, August.









PROCEDURES

All tests were drill seeded at a rate of 100 kg/ha. No

fertilizers were applied to any of the test sites. Plots

consisted of six rows spaced 20 cm apart and 6 m in length.

Entries were arranged in a randomized complete block design

consisting of five replications. Seeding vigor is a visual

estimate of stand density and plant vigor. Days to 50% heading,

a relative indication of maturity, are the number of days from

planting to head emergence of 50% of the plants in the stand

based on a visual estimate. At maturity, plant height was

measured from the ground level to the tip of a group of panicles.

Plot yields were obtained by harvesting the four center rows 6 m

in length with a small plot combine. Yield samples were then

oven dried, weighed, analyzed for moisture content and recorded

as grain yield at 12% moisture.



RESULTS

EREC

Birds severely damaged the VE test, therefore it was not

harvested at this location.

Stand establishment was good in the EM test. Seedling vigor

scores were taken on April 22, eight days after planting, Table

3. The more vigorous lines were substantially emerged at that

time while the less vigorous lines were just emerging.

Therefore, these scores should give a good estimate of the

relative vigor of the lines in this test. In general, the


3









PROCEDURES

All tests were drill seeded at a rate of 100 kg/ha. No

fertilizers were applied to any of the test sites. Plots

consisted of six rows spaced 20 cm apart and 6 m in length.

Entries were arranged in a randomized complete block design

consisting of five replications. Seeding vigor is a visual

estimate of stand density and plant vigor. Days to 50% heading,

a relative indication of maturity, are the number of days from

planting to head emergence of 50% of the plants in the stand

based on a visual estimate. At maturity, plant height was

measured from the ground level to the tip of a group of panicles.

Plot yields were obtained by harvesting the four center rows 6 m

in length with a small plot combine. Yield samples were then

oven dried, weighed, analyzed for moisture content and recorded

as grain yield at 12% moisture.



RESULTS

EREC

Birds severely damaged the VE test, therefore it was not

harvested at this location.

Stand establishment was good in the EM test. Seedling vigor

scores were taken on April 22, eight days after planting, Table

3. The more vigorous lines were substantially emerged at that

time while the less vigorous lines were just emerging.

Therefore, these scores should give a good estimate of the

relative vigor of the lines in this test. In general, the


3









hybrids and the tall cultivars had superior seedling vigor

compared to the semi-dwarfs with a few notable exceptions (RA

2215 and V 4716). Approximately three weeks after emergence some

cultivars began showing signs of manganese (Mn) deficiency.

Although a permanent flood was established 7-10 days after the

first signs of the deficiency some cultivars were more affected

than others, notably the three hybrids and experiment line (EL)

1179. It is hard to estimate what effect the Mn deFiciency had

on yields of individual cultivars, although the overall yield of

5000 kg/ha was satisfactory. The three highest yields in the

test were obtained by the three hybrids despite the fact that RA

2209 and RA 2217 had 50 and 70% lodging, respectively, at

harvest. Newbonnet had the highest yield of all ci Jtivars

followed closely by Rico 1, Mars, Gulfmont and Lemont. The

lowest yielding cultivar was Della, but some selective bird

feeding was partially responsible for its poor performance.

Days to 50% heading (DTH) ranged from 103 for IR 841 to 77

for RA 2215. Yields of IR 841 were affected by itr lateness

since the test was drained before IR 841 was ripe. It is

interesting to note that even though Ri' 2215 matured much earlier

than the rest of the cultivars in the test, it did not seem to be

damaged by birds and had the highest yield in the test. The

remainder of the cultivars in the test matured over a two week

time span (86-100 DTH).

Mature plant heights ranged from 119 cm for Della to 83 cm

for Rexmont with an overall mean of 98 cm. Plant heights in this

4









test were comparable to other tests in the past and reflect

normal growing conditions.

STATE LAND

The SL test began well with good planting conditions and

adequate stands were soon established after planting. Later in

the season though, difficulties occurred. Shortly after the

permanent flood was applied a moderate to heavy infestation of

rice water weevil was observed. No treatment was applied for

control of the weevil. During the middle of the season pumping

problems led to intermittent draining over a several week period.

Finally, during the grain filling period, yields were affected by

the occurrence of blast. All of these factors led to low yields

in both tests.

Very-Early The overall yield for the VE test was 2681

kg/ha, Table 4. The five hybrids were statistically equal in

yield and significantly higher in yield than the other entries in

the test. This demonstrates the superior performance of hybrids

compared to standard cultivars even under adverse conditions.

Labelle and experimental line EL 006 had significantly lower

yields than the other entries in the test while Bond, Skybhnet,

Tebonnet and EL 3113 were statistically equal in yield to each

other and intermediate between the hybrids and Labelle and EL

006. V 7713 is an extremely early maturity cultivar and was past

maturity at the time the test was harvested, therefore its yields

were not included.









Early-Midseason Again, growth and development of the rice

in this test were affected by the conditions mentioned earlier

and these poor growing conditions are reflected in the reduced

plant height of most cultivars, Table 5. The overall yield of

3130 kg/ha was somewhat better than that of the VE test.

Generally, longer season maturity cultivars have higher yields

than shorter season cultivars under adverse conditions. Once

again, the hybrids had higher yi l!ds than the other entries in

the test. The next highest grouping included three medium

grains, Mars, Rico 1 and Mercury, and EL 1179 which is a long

grain. EL 1179 is targeted to be a replacement for the blast

susceptible Newbonnet and in this test, where blast was present,

it did show superior performance ',nd promise. Lebonnet was

superior to the two commonly grown semi-dwarfs, Lemont and

Gulfmont. It is common in the EAA for Lebonnet to out perform

the semi-dwarfs when they are grown in low yielding environments

such as in this case.

HARLEY WATSON FARM

This site had the best soil (highest in mineral content thus

higher available siL2con), was planted earliest (earlier

plantings are generally higher yielding than later plantings) and

had better management than the other two locations. It was not

without its problems though. The test area was rolled as is done

at all locations, prior to planting. Since this soil is heavier,

the rolling packed the soil so tight it was difficult to get the

drill to penetrate deep enough for good seed placement which led

6









to uneven stands. In some areas of the test there were low spots

where water stood after flushing and stand was reduced in these

areas. But after the permanent flood was applied the stands soon

filled in and the rice grew extremely well, producing the highest

yields of all of the locations in 1988. Therefore, this location

gives a good indication of the upper yield limits of the entries

included in the test.

Very Early The overall yi;ld of the VE test was 5615

kg/ha, Table 6. Because the VE group was grown with the EM group

in a commercial field of Lemont, the VE group was past maturity

at harvest and all cultivars had some bird damage, with Tebonnet

suffering the most and Skybonnet having the least amount of

damage. Yields would have been higher if the test had been

harvested at the appropriate time. The short statured EL 3113

had the highest yield of the test, 7418 kg/ha. It was followed

by the tall cultivar Skybonnet at 6991 kg/ha. Bond and Labelle

had similar yields which were similar to the test mean yield.

Tebonnet's yield was low because' -of bird damage and V 7713 which

is extremely early in maturity, had its yields lowered both by

bird damage and over'ripeness. Therefore, the yield of these two

cultivars in this test does not reflect their true yield

potential.

Ratoon yields were obtained at this location and are given

in Table 6. Skybonnet had an excellent ratoon yield of 4363

kg/ha. Tebonnet also had a good ratoon yield. Bond had the









lowest ratoon yield. Bond has been shown to have consistently

low ratoon yields in past years.

Early-Midseason The mean yield of the EM test was 7915

kg/ha, Table 7. Newbonnet and Rico 1 had the highest yields of

all entries, both exceeding 9200 kg/ha. The RiceTech line,

V 7817, had an excellent yield of 8809 kg/ha which gives an

indication of its yield potential in high yielding environments.

A group of cultivars had yields similar to each other and near or

above average. Della and Lebonnet had yields below average, but

these yields probably were close to their upper yield limit. The

poor yield of V 4716 is not understood since this cultivar had

excellent seedling vigor and vegetative growth.

Ratoon yields for the EM group are also given in Table 7.

Mars had a ratoon yield of over 4000 kg/ha followed closely by

Lebonnet and Rico 1 which had yields of over 3700 kg/ha. The

yields of CB 801, Rexmont and V 7817 were not taken because

ratoon height of these cultivars was less than could be harvested

by the combine. Plant and ratoon crop yields combined, averaged

over 10,000 kg/ha with three cultivars yielding more than 12,000

kg/ha.

SUMMARY

Very Early The mean yields of the cultivars tested in the

VE group in 1988 are presented in Table 8. Mean yields of

cultivars not included in the HWF test may have unjustly low mean

yields simply because yields from that location were so high.

The overall mean yield of the two locations was 4163 kg/ha. This









yield was considerably lower than the mean yield of the EM group

at these two locations (5523 kg/ha) and reflects damage done by

birds to the VE group because they were grown in the same test as

the EM group, and thus were not harvested in a timely fashion.

The four commercially available cultivars grown in the VE

group (Bond, Labelle, Skybonnet and Tebonnet) had yields ranging

from 4739 to 3562 kg/ha. Skybonnet, with the highest yield, may

have benefited some !rom being the latest maturing cultivar in

the group, thus avoiding some bird damage. In the past,

Skybonnet had been included in the EM group, but since it always

suffered from bird damage (it was the earliest maturing cultivar

of that group), it was shifted to the VE group this year. Still,

Skybonnet continues b show good yield potential in both the

plant and ratoon crops. Bond had the next highest yield of this

group, although it was only 400-500 kg/ha higher than Tebonnet

and Labelle, respectively.. Tebonnet appeared to have somewhat

higher bird damage than the rest of the cultivars, possibly

because it is so ta3l). Whatever the reason, it did not perform

well in tests in 1988 with the exception of its ratoon

performance at the HWF location. Labelle, as in the past,

continues to show inconsistent yields. Its maximum yield

potential tends to be low and it performs very poorly under

adverse conditions.

Experimental line 3113 showed excellent yield potential and

had the highest yield in the entire group. Experimental line

3113 will probably be released as a new cultivar to selected seed









growers this year. By the time it is available to the public (1-

2 years) we should have a good idea of its potential in the EAA.

Experimental line 006 did not perform well at the one location

yield data was obtained on it in 1988. Further testing will be

needed to determine its suitability for production in the EAA.

V 7713, the very early line from RiceTech was severely damage by

birds because of its extreme earliness, therefore its yield

potential cannot be determined from these tests. All four

experimental hybrids yielded above average in the single test

site in which they were included. These hybrids are still in the

testing stage, though, and are not recommended at this time.

Early-Mid Season The mean yields of the cultivars tested

in the EM group in 1988 are presented in Table 9. The three )

tests reflect the performance of the cultivars in three distinct

yield environments: low (SL), medium (EREC), and high (HWF).

Therefore, these tests should give a good indication of a

cultivars performance over a broad spectrum of conditions. The

overall mean yield of the three tests was 5348 kg/ha. Six

cultivars had mean yields exceeding the overall mean. Four of

the cultivars that had mean yields below the overall mean were

not included in the HWF trial. Three of these four cultuivars

(RA 2209, EL 1179 and IR 841) had above average yields at the two

other locations and therefore most likely would have done well at

the HWF location. Only one cultivar, Gulfmont, that was in the

above average group, is currently recommended for production in

the EAA. Rico 1 and Mars are medium grain cultivars, and medium

10









grain rice is not currently produced in Florida. Newbonnet,

although frequently a good yielding cultivar, is susceptible to

blast and also generally has poor ratoon yields. The hybrids RA

2215 and RA 2217 are experimental and do not have acceptable

grain quality. The two other recommended cultivars in the test,

Lebonnet and Lemont had yields close to average. The poor

performance of Lemont at the SL location accounts for its below

avere e overall yield. Lebonnet on the other hand, had yields

below average at the EREC and HWF site. The RiceTech line

V 7817, which is an improved selection of CB 801 (also from

RiceTech), had an overall yield essentially equal to the overall

test mean. In limited testing V 7817, which is a semi-dwarf,

appears to respond to the various yield environments in a similar

mann( r as Lemont, i.e. above average in high yield environments,

but rather poorly in low yield situations. The other line from

RiceTech, V 4716, a medium grain, did not do well in testing in

1988. Mercury and Rexmont, two commercially available cultivars,

also did not yield well in tests in 1988, which is consistent

with results of past years and indicates these cultivars are not

well adapted to the EAA. Della, an aromatic cultivar, had low

yields at all locations and, although some of its poor

performance can be blamed on selective bird feeding, it has also

given consistently low yields in testing in past years.

Experimental line 155 is an intermediate statured aromatic line

derived from Della. Although its performance was only fair at

the two locations at which it was tested, it was superior to









Della at both locations with a mean yield of 3829 kg/ha vs 2581

kg/ha for Della at the same two sites. IR 841 is also an

aromatic line with special cooking characteristics. It performed

slightly above average at the two locations at which it was

tested. Further testing is necessary to adequately evaluate its

yield potential in the EAA. Experimental line 1179, like EL 3113

in the VE group, will probably be released as a cultivar in 1989.

Again, as with EL 3113, by the time it is available to the pi'lic

we should have a better idea of its performance when grown in the

EAA.









Table 1.


General description of very-early season maturity rice
cultivars tested in the Everglades Agricultural Area in
1988.


Plant Grain State of
Cultivar TypeI Maturity2 Type3 Origin Comment


Bond I VE L AR Public
Labelle T VE L TX Public
RA 2003 S VE L RA Hybrid
RA 2004 S VE M RA Hybrid
RA 2006 I VE M RA Hybrii
RA 2009 S VE L RA Hybr- 1
RA 2011 S VE L RA Hybrid
Skybonnet T E L TX Public
Tebonnet T VE L AR Public
V 7713 S VE L RT Private
EL 006 S VE L TX Exptl Line
EL 3113 I VE L TX Exptl Line


S = Short (< 90 cm), I = Intermediate (90 99 cm),
T = Tall (100+ cm)
2VE = Very Early, E = Early
L = Long, M = Medium
AR = Arkansas, RA = Ring Around Products, RT = RiceTech,
TX = Texas










Table 2.


General description of early-mid season maturity rice
cultivars grown in the Everglades Agricultural Area in
1988.


Plant Grain State of
Cultivar Type' Maturity2 Type3 Origin Comment


CB 801
Della
Gulfmont
IR 841
Lebonnet
Lemont
Mars
Mercury
Newbonnet
RA 2209
RA 2215
RA 2217
Rexmont
Rico 1
V 4716
V 7817
EL 155
EL 1179


Private
Public
Public
Public
Public
Public
Public
Public
Public
Hybrid
Hybrid
Hybrid
Public
Public
Private
SPrivate
Exptl Line
Exptl Line


S = Short (<90 cm), I = Intermediate (90 99 cm),
T = Tall (100+ cm)
2E = Early, M = Midseason, L = Late Season
3L = Long, M = Medium
AR = Arkansas, LA = Louisiana, RA = Ring Around Products,
RT = RiceTech, TX = Texas



















14









Table 3.


Performance of early-mid season maturity rice cultivars
grown at the Everglades Research and Education Center
(EREC), Belle Glade, FL, 1988.1


Grain Seedling Days to 50% Mature Plant
Cultivar Yield2 Vigor3 Heading Height

(kg/ha) (No.) (cm)

Della 3288 g 3.0 bc 95 a-c 119 a
CB 801 4649 c-f 1.4 g-i 100 ab 85 i
Gulfmont 5351 b-e 2.0 e-g 88 b-d 92 fg
Lebonnet 4860 c-f 2.8 b-d 88 b-d 101 e
Lemont 5246 b-e 1.6 f-h 94 a-c 93 fg
Mars 5403 b-e 3.2 ab 91 bc 106 bc
Mercury 4412 ef 2.2 d-f 86 cd 88 hi
Newbonnet 5639 a-d 3.2 ab 92 a-c 104 c-e
Rico 1 5398 b-e 1.2 hi 93 a-c 93 fg
Rexmont 4088 fg 0.8 i 92 a-c 83 i
IR 841 5022 c-f 2.4 c-e 103 a 104 c-i
EL 155 4998 c-f 1.6 f-h 95 a-c 96 f
EL 1179 5014 c-f 3.0 bc 95 a-c 102 de
V 4716 4601 e-f 3.0 bc 93 a-c 84 i
V 7817 4888 c-f 1.2 hi 98 a-c 86 hi
RA 2209 5744 a-c 3.8 a 92 a-c 109 b
RA 2215 6571 a 3.4 ab 77 d 95 f
RA 2217 6290 ab 3.0 bc 90 bc 106 bc

MEAN 5000 2.4 92 98


1Planting date:
Harvest date:


April 14, 1988
August 25, 1988


2Rough rice at 12% moisture

3Visual rating: 1 = poor, 5 = excellent










Table 4.


Performance of very-early season maturity rice
cultivars grown at the State Land Farm, El Rodeo
Investment Corp., Lake Harbor, FL, 1988.


Grain Mature Plant
Cultivar Yield2 Height

(kg/ha) (cm)
Bond 2430 b 94 a-c
Labelle 1610 c 100 ab
Skybonnet 2486 b 100 ab
Tebonnet 2323 b 104 a
EL 3113 2169 b 84 c-e
EL 006 1542 c 84 c-e
RA 2003 3283 a 89 c-e
RA 2004 3244 a 89 c-e
RA 2006 3628 a 93 b-d
RA 2009 3362 a 84 c-e
RA 2011 3417 a 84 c-e
V 7713 -- 79 e

MEAN 2681 90


Planting date:
Harvest date:


April 25, 1988
August 31, 1988


2Rough rice at 12% moisture









Table 5. Performance of early-mid season maturity rice cultivars
grown at the State Land Farm, El Rodeo Investment
Corp., Lake Harbor, FL, 1988.


Grain Mature Plant
Cultivar Yield2 Height

(kg/ha) (cm)

Della 1874 h 112 a
CB 801 2145 gh 80 f
Gulfmont 2810 d-f 83 f
Lebonnet 3173 c-e 102 bc
Lemont 2205 gh 79 f
Mars ) 4083 ab 103 b
Mercury 3518 bc 85 ef
Newbonnet 2861 d-f 98 bc
Rico 1 3681 bc 95 b-d
Rexmont 2337 f-h 79 f
IR 841 3281 cd 93 c-e
EL 155 2660 e-g 94 b-d
EL 1179 3613 bc 98 b-d
V 4716 3088 c-e 80 F
V 7817 ) 2172 gh 79 f
RA 2209 4534 a 103 b
RA 2215 4309 a 92 de
RA 2217 4605 a 100 b-d

MEAN 3130 92


1Planting date:
Harvest date:


April 25, 1988
August 31, 1988


Rough rice,at 12% moisture










Table 6. Performance of very-early season maturity rice
cultivars grown at Harley-Watson Farms, Lake Harbor,
FL, 1988.1


Grain Yield2
Cultivar
PC RC Total
------------kg/ha-----------

Bond 5654 bc 1678 d 7332
Labelle 5513 bc 2440 c 7953
Skybonnet 6991 ab 4363 a 11354
Tebonnet 4965 c 3139 b 8104
EL 3113 7418 a 2567 bc 9985
V 7713 3250 d -- 3250

MEAN 5615 2837 8452


Planting date: March 26, 1988
Harvest date: PC August 15, 1988; RC October 27, 1988

'Rough rice at 12% moisture



-1










Table 7.


Performance of early-mid season maturity rice cultivars
grown at Harley-Watson Farms, Lake Harbor, FL, 1988.1


Grain Yield2
Cultivar
PC RC Total
-------------kg/ha------------


Della
CB 801
Gulfmont
Lebonnet
Lemont
SMars
SMercury
Newbonnet
Rico 1
Rexmont
V 4716
V 7817


MEAN


6977 cd
7983 a-c
8365 a-c
7532 bc
8298 a-c
8135 a-c
7312 b-d
9244 a
9236 a
7852 a-c
6027 d
8809 ab


7915


1Planting date:
Harvest date:


March 26, 1988
PC August 15,


1988; RC October 27, 1988


2Rough rice at 12% moisture


3146 ab

1358 de
3725 ab
2125 cd
4154 a
1284 de
2770 bc
3707 ab

952 e


2684


10123
7893
9723
11257
10423
12289
8596
12014
12943
7852
6975
8809

10599










Table 8.


Summary of yield performance of very early maturity
rice cultivars tested in the EAA in 1988.


Location


Cultivar


--------------------kg/ha-----------------


EL 3113
Skybonnet
Bond
Tebonnet
RA 2006
Labelle
RA 2001
RA 2009
RA 2003
V 7713
RA 2004
EL 006

MEAN


HWF


MEAN


2167
2486
2430
2323
3628
1610
3417
3362
3283

3244
1727

2698


7396
6991
5654
4965

5513



3250



5628


4782
4739
4042
3644
3628
3562
3417
3362
3283
3250
3244
1727

4163










Table 9.


Summary of yield performance of early-midseason
maturity cultivars tested in the EAA in 1988.


Location
Cultivar EREC SL HWF MEAN
---------------------kg/ha---------------

Rico 1 5398 3681 ,9236 6105
Newbonnet 5639 2861 9244 5915
Mars 5403 4083 8135 5874
Gulfmont 5351 2810 8365 5509
RA 2217 6290 4605 -- 5448
RA 2215 6571 4309 -- 5440
V 7817 4888 2172 '809 5290
Lemont 5246 2205 298 5250
Lebonnet 4860 3173 7532 5188
RA 2209 5744 4534 -- 5139
Mercury 4412 3518 7312 5081
CB 801 4649 2145 7983 4926
Rexmont 4088 2337 7852 4759
V 4716 4601 3088 6027 4572
EL 1179 5014 3613 -- 4314
IR 841 5022 3281 -- 4152
Della 3288 1874 J977 4046
EL 155 4998 2660 -- 3829

MEAN 5000 3130 p915 5348










APPENDIX


Table 1. Comparison of 1988 and 63 year average for mean
temperature and rainfall data for the EAA rice
growing season.

Mean Monthly Total Monthly
Temperature, oF Rainfall, inches
---------------- -----------------
63 year 1988 63 year 1988
average average


March 67.3 66.3 3.04 1.78
April 70.9 71.1 2.92 2.0?,i
May 75.0 74.0 5.00 2.5.)
June 78.7 79.0 8.76 3.91
July 80.3 80.5 7.96 8.15
August 80.6 80.5 7.97 8.89
September 79.6 80.1 8.51 2.47
October 75.2 74.5 4.35 0.11
November 69.0 72.1 2.22 1.31

MEAN 75.2 75.3 50.73 31.19.
i)