Lubbock, Texas
April 15, 2004
Selecting productive cotton
varieties is not an easy task -- particularly on the Texas High
Plains, where weather can literally "make or break" a crop. A
Texas Cooperative Extension cotton agronomist advises producers
to do their homework by comparing several characteristics among
many different varieties and then keying these characteristics
to typical growing conditions.
"We can't control our growing environment from year to year, but
we can select the varieties we plant based on positive traits,"
said Randy Boman, Extension cotton agronomist based at Lubbock.
"It is very important to select and plant varieties that fit
your farm -- varieties with the genetic potential to achieve
good lint quality and total yield.
"The 2003 crop year in the Texas High Plains was a challenging
one. In spite of the weather, many producers achieved record
yields on their farms. Many others had a tough year. June
weather destroyed more than 1 million acres, mostly on the best
irrigated land. Early dryland crop prospects declined due to
record low rainfall in July and August," Boman said. "Additional
hail in September and October damaged a substantial amount of
acres. 2003 was one of our driest years on record. It was also
another year of above-normal heat unit accumulation and
favorable harvest conditions on the High Plains. This weather
favored many of the longer-season, open-boll type cottons that
have gained popularity in recent years."
The 2003 crop totaled about 2.4 million bales. As a whole, the
crop had excellent color and leaf grades, low bark percentage
and the highest average staple length since 1996. The average
strength was also very high, he said. About 61 percent of the
crop had a 34 or longer staple length, which was the highest
since 1997.
"At the same time, 2003 was unfortunately another
high-micronaire year. Our micronaire averaged 4.4, which tied
for the highest micronaire value on record. Only the 2001 crop
had equivalent micronaire value. About 18 percent of the 2003
crop had high micronaire, which was just below the 19 percent
observed in 2001," Boman said. "High micronaire combined with
short staple length can result in substantial discounts, based
on the Commodity Credit Corporation loan chart.
"Fortunately, 2004 looks promising due to outstanding winter
precipitation. Additional new varieties and technologies are on
the way that can help producers boost their profitability. Look
for new varieties from several seed companies in 2004. Bollgard
II will be available in several new varieties, as well as
several new Liberty Link herbicide-tolerant varieties."
Even so, growers should not plant fence-row to fence-row with
one type of cotton, he added.
Agricultural Extension agents can advise growers on variety
performance in local field trials. The Plains Cotton Improvement
Program's replicated large-plot systems variety trials,
sponsored by Plains Cotton Growers and Cotton Inc., also contain
good baseline information that can help growers evaluate and
compare potential field performance, Boman said.
"The variety trials conducted by John Gannaway, Texas
Agricultural Experiment Station cotton breeder, at Lubbock and
many other High Plains sites, is another good source of
comparison information. Gannaway's performance trials provide
the only unbiased information on large numbers of varieties sold
on the High Plains, particularly new ones such as Liberty Link
and Bollgard II," Boman said. "It is best to consider multi-year
and multi-site performance averages when they are available. At
the same time, there are many new varieties appearing on the
scene that have not undergone multi-year university testing."
Yield potential is probably the single most important agronomic
trait in producers' minds, but they should also give significant
consideration to lint quality.
"We sell pounds of lint, but the value of each pound is a
function of fiber quality – so these two characteristics are
closely linked to profitability. But we also want to consider
adaptability," Boman said. "Many long-season picker cottons may
be better adapted to areas with longer growing seasons, but some
of these varieties have produced record yields and quality on
the Plains, due to extremely warm September weather in recent
years.
"Growers who made record yields with those varieties had
above-normal heat accumulation. They also terminated irrigation
and applied harvest aids (defoliants/desiccants) in a timely
fashion, and they got their crop out of the field early."
Even when growers can catch a "run of good weather," they should
not leave open-boll picker cottons in the field until a freeze
conditions the plants for harvest. Unacceptable pre-harvest lint
loss is likely to result, the agronomist said.
"On the other hand, storm-proof stripper varieties are more
suited to our harvesting conditions, and they are more likely to
survive damaging weather at harvest without considerable lint
loss," Boman said. "Check the storm-proofness of any variety on
your potential planting list. If you do choose an open-boll
picker variety, plan and budget ahead for a good harvest aid
program that will let you achieve an early harvest.
"Don't be caught with lots of lint in the field, but no chance
to harvest due to inclement weather."
The value of transgenic varieties is another consideration.
Growers should consider varieties bred for herbicide tolerance,
and/or insect resistance – such as Roundup Ready, BXN, Liberty
Link, Bollgard, and Bollgard II – only if this technology is a
bargain compared to typical traditional weed or insect control
costs for a specific field, he said.
"The jury is still out on the value of Bollgard and Bollgard II
in the High Plains, because our bollworm and budworm pressure is
generally light. However, based on 2003 southern High Plains
research, Bollgard II had 75 percent less bollworm damage when
compared to Bollgard. Pink bollworms may be a significant
problem in 2004 in some areas, and Bt technology works
exceptionally well on that pest," Boman said. "At the same time,
the inherent agronomic performance of some Bollgard+Roundup
Ready 'stacked gene' varieties may simply be better than some
Roundup Ready cottons – even though both have the same genetic
background."
Resistance to diseases such as verticillium or fusarium wilt,
bacterial blight and root-knot nematodes is a valuable trait for
most of the High Plains. Regardless of how they prioritize
agronomic traits and qualities, growers should strive for
diversity when selecting cotton varieties, the agronomist said.
"Don't plant the entire farm to only one variety," Boman said.
"Matching varieties and transgenic technologies to specific
fields will help you spread your production risk. It is simply
good management."
Growers can obtain a copy of Gannaway's "2003 Cotton Performance
Tests in the High Plains and Trans-Pecos Areas of Texas," and
Extension's "Systems Agronomic and Economic Evaluation of
Transgenic and Conventional Cotton Varieties in the Texas High
Plains," from agricultural Extension agents or from The Texas
A&M University System Agricultural Research and Extension Center
at Lubbock. These and other crop production publications,
including a brief article on the new Liberty Link system, are
also available on the Internet at:
http://lubbock.tamu.edu.
The Lubbock center telephone number is (806) 746-6101.
Writer:
Tim W. McAlavy |