ISHS Acta Horticulturae 255: III International Symposium on Soil Desinfestation
ENHANCED DISINFESTATION EFFECTS OF SOIL FUMIGATION WITH SEALING BY FILM FORMING EMULSIONS |
| Author: | H. Bochow |
| Abstract:
After model testing of different commercial film forming bitumen and bitumen-latex emulsions in their inhibition effect on water evaporation, sprays of the relatively cheap, water soluble bitumen substance EL (from soft cool), diluted to 45 %, were found to have similar sealing effects as a plastic sheet. In field experiments on sandy soil, the bitumen sprays were tested in their sealing effect after the use of soil disinfestants metham-sodium and dazomet. Compared to non sealing after applications of these chemicals for soil fumigation, disinfestation effects were enhanced by a bitumen soil sealing film, left for 7 days. The result can be compared to the effect of a plastic sheet as a soil cover. The growth of further vegetable crops was better and the control effect on buried test pathogens higher. Several years of experiences in the large scale use of film forming bitumen sprays for 7 days soil sealing after application of the disinfestants metham-sodium or dazomet on sandy soil or for upper soil disinfestations in greenhouses, where sealing was generally necessary for effective soil fumigation, have shown the positive value of that procedure in the technology of chemical soil disinfestation. There are advantages to the use of plastic sheets. First experimental results with sprayings of film forming specific latex emulsions after soil applications of metham-sodium, found in cooperation with the University of Minnesota, USA, using the test-pathogen Verticillium dahliae in buried potato debris, indicated possibilities for enhancing the soil disinfestation effect of metham-sodium by this kind of soil sealing, too. | |
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