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Title: DIFFERENCES IN COTTON YIELD, ROOT GROWTH, AND ROTYLENCHULUS RENIFORMIS FOLLFOLLOWING DEEP SOIL FUMIGATION

Author
item Robinson, Arin
item COOK, C
item BRADFORD, J
item Bridges, Alan
item Bautista, Jose

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 8/30/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Recent cotton surveys have shown highest population densities of Rotylenchulus reniformis frequently more than 50 cm deep. To investigate the impact and origin of deep R. reniformis, soil in a field at Weslaco, Texas was fumigated in November by digging post holes 90 cm deep and placing 2 ml of 1,3-dichloropropene 90, 60 and 30 cm deep as holes were refilled. Altogether, 14 fumigated holes were spaced on 51-cm centers along the bed and the adjacent furrow. Fumigant-free post holes, unfumigated chiseled areas, and chisel-fumigated areas were included. In the spring, fumigation to 90 cm had killed most R. reniformis down to 105 cm and 50-100 cm laterally whereas chisel fumigation 43 cm deep killed nematodes only in the top 60 cm. At cotton harvest in July, root density was always highest near the surface and more or less uniform from 30 to 105 cm. The most striking effect was continued nematode population control at harvest at all depths following deep fumigation, compared with complete resurgence of nematode populations in chisel-fumigated plots. Fumigation doubled yields in both cases.