Kan suksa prasitthiphap khong san kamchat watchaphut triclopyr lae fluroxypyr nai kan thamlai ton sapparot.
1992
Numchai Loyrithiwudthikrai
Efficacy study with the 8-month-old plants showed that the rate at 2.0 kg ae/ha triclopyr and fluroxypyr gave more injury to the internal tissue of pineapple stumps compared with the lower ones. Triclopyr induced more phytotoxic effects on the internal tissue compared with that of fluroxypyr at the same rates. In contrast, fluroxypyr resulted in more injury to the external tissue. Study on shoot cutting at days after application, the shoot cutting at 5 and 7 days slightly reduced the herbicide phytotoxicity. For spray volume requirement, the volumes at 2,000, 1,000 and 500 L/ha produced better efficacy than with 250 L/ha. Adding 1.25 kg ion/ha of paraquat to the spray mix of triclopyr and fluroxypyr was found to decrease the phytotoxicity especially with triclopyr. Fluroxypyr needed 2 hr of the simulated rainfall to provided the full efficacy whereas triclopyr required 4 hr. The experiment under field conditions was conducted with fluroxypyr 1.5 and 2.0, triclopyr 2.25 and 3.0 kg ae/ha and followed by heavy-dish ploughing at 5 and 45 days after application (DAA) in rainy season. At 90 DAA, the density of growing volunteer seedlings was about 15 to 20 % compared with those of the untreated control, and almost all were from the plant crop stumps. The land preparation by this technique could be used for the new planting in about 3 months after application, or 3 months earlier than the normal practice and with the less number of ploughing at least 2 rounds.
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