HOW TO increase the yield of cotton to meet the growing domestic demand of a growing population and export-oriented textile sector has remained a dilemma for Pakistani cotton since 1990s.
Local perceptions and myth are that Bt cotton increases yields, but the available data tells a different story.
According to the data published by United States Department of Agriculture (USDA), the agriculture cotton data about Pakistan and Australia clearly shows that average yields have remained the same between 1990 and 2010, although Bt technology is being experimented in Australia since 1996 and in Pakistan informally since 2005.
In Australia, yield per acre in 1991 (before Bt cotton) was 1,588 lbs and in 2010 (with BG-II & RRF) was 1,457 lbs.
Similarly, in Pakistan, the yield was 685 pounds per acre in 1990-91 but it went down to 622 pounds per acre in 2009.
So, “where is the average yield increase we all talk about ?” is the all-important question being asked by experts in agriculture in the country.
In Australia, the benefits have mainly been environmental as lesser pesticide sprays have resulted in these benefits but in Pakistan, unless white fly, mealy bugs and cotton leaf curl virus (CLCV) are controlled even the pesticide savings will not result.
The reason is simple that Bt cotton technology doesn’t control CLCV, etc.
Reliable sources privy to the progress made in biotechnology and especially in Bt cotton in Pakistan show that in India, Bt cotton has been a success to some extent because boll worms occurrence is high.
But since that’s not the case in Pakistan, quoting Indian Bt cotton example would be wrong.
Experts in agriculture say that Bollgard-1 technology is effective against pink, spotted and American boll worms.
It contains a gene in addition to its natural composition called Cry-1-AC. This is effective against the fore mentioned pests. Bollgard-2 contains an additional trait called Cry-2-AB which is effective toxin against Army boll worms. So, when combined, these two genes are effective against the 4 types of boll worms.
India has high instance of these cotton crop pests, so when the GM or Bt cotton was introduced, it was effective against these pests and yield increase was witnessed during the last decade.
However, in Pakistan, boll worms are far less in number and, except for Army worms, the others are a rarity.
Thus, when Bt cotton was introduced via smuggled seeds in Pakistan during 2002-03, it did not prove very effective as here the mealy bugs and Cotton Leaf Curl Virus are the main crop pests and Bt cotton is not effective against either.
Thus, despite all the claims, Pakistan’s overall cotton production has remained the same since 1990.
Experts claim that an interesting factor is that despite having the latest Bollgard-2 Bt cotton technology, India is still behind Pakistan in per acre yield, which shows that Pakistan’s local cotton seed varieties are superior.
The USDA-compiled table about Pakistan cotton yield and production shows the details as under:
PAKISTAN
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Year (August 1 Harvested Yield Production
– July 31) Area (000) Pounds (000) 480-
Acres /Acre pound bales
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2010 7,166 589 8,800
2009 7,413 622 9,600
2008 7,166 583 8,700
2007 7,413 557 8,600
2006 8,031 574 9,600
2005 7,663 617 9,850
2004 7,888 678 11,138
2003 7,386 510 7,845
2002 6,904 554 7,972
2001 7,700 517 8,286
2000 7,235 556 8,379
1999 7,371 571 8,776
1998 7,223 456 6,863
1997 7,314 471 7,175
1996 7,781 451 7,319
1995 7,408 536 8,272
1994 6,548 458 6,250
1993 6,931 435 6,282
1992 7,008 484 7,073
1991 7,008 685 10,000
1990 6,578 549 7,522
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AUSTRALIA
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Year (August 1 Harvested Yield Production
– July 31) Area (000) Pounds (000) 480-
Acres /Acre pound bales
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2010 1,483 1,457 4,500
2009 494 1,725 1,775
2008 405 1,778 1,500
2007 161 1,908 640
2006 356 1,820 1,350
2005 830 1,619 2,800
2004 776 1,856 3,000
2003 484 1,686 1,700
2002 544 1,482 1,680
2001 998 1,606 3,340
2000 1,248 1,423 3,700
1999 1,147 1,447 3,458
1998 1,320 1,210 3,327
1997 1,107 1,373 3,166
1996 979 1,369 2,792
1995 744 1,271 1,970
1994 549 1,346 1,539
1993 652 1,112 1,511
1992 647 1,271 1,713
1991 697 1,588 2,306
1990 689 1,386 1,989
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INDIA
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Year (August 1 Harvested Yield Production
– July 31) Area (000) Pounds (000) 480-
Acres /Acre pound bales
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2011 29,652 437 27,000
2010 27,577 418 24,000
2009 25,476 433 23,000
2008 23,243 467 22,600
2007 23,324 494 24,000
2006 22,649 462 21,800 ==================================================
Via: Business Recorder
