Oakes Irrigation Research
Site
Carrington Research Extension Center * North Dakota State University
P.O. Box 531, Oakes, ND 58474-0531, Voice: (701) 742-2189, FAX: (701)
742-2700, email: rgreenla@ndsuext.nodak.edu
ORIENTAL VEGETABLE WEED CONTROL STUDY, 1996
Richard G Greenland
Oriental vegetable production is new in North Dakota. We need more information on weed control with our weeds and conditions. Since the oriental vegetables used in this study are related to cabbage, we experimented with herbicides labeled on cabbage. Some of these chemicals are not labeled for these oriental vegetables and must not be used commercially until they are labeled.
Table 55. Herbicide treatments.
Table 62. Weed control ratings.
Table 63. Number of heads harvested.
MATERIALS AND METHODS
| Soil: | Embden sandy loam; pH=6.9; 3.0% organic matter; soil-P was high; soil-K was medium; soil-S was very low. |
| Previous crops: | 1995 - muskmelon; 1994 - pepper; 1993 - field corn. |
| Seedbed preparation: | Disked on April 22. Multiweeded (field cultivated) on April 22 to incorporate fertilizer. Multiweeded twice on April 29 to incorporate herbicide treatments. |
| Planting: | Direct seeded on April 30 with a Stanhay vegetable planter in 16 inch rows. Seeds were placed about 3/4 inch deep into a flat, fine seedbed. |
| Plots: | Plots were 17 ft long by 6 ft wide and arranged on 9 ft centers (giving a 3-ft check strip between plots). The study had 4 reps. |
| Fertilizer: | On April 17, broadcast 14 lbs N/acre and 70 lbs P2O5/acre as 10-50-0, 16 lbs N/acre and 19 lbs S/acre as 21-0-0-24, and 94 lbs K20/acre as 0-0-60. Sprayed 35 lbs N/acre as 28-0-0 on April 22. |
| Irrigation: | Surface drip irrigation as needed. |
| Pest Control: | Weed control treatments were the first seven treatments listed in table 55. Sevin (1.5 pts/acre on May 15 and May 29) controlled flea beetles. Asana (8 oz/acre on July 10) controlled cabbage looper and cabbage worm. |
| Harvest: | Daikon radishes were hand harvested on June 28, pak choi and napa cabbage were harvested July 9. We harvested broccoli July 19 and July 30. |
RESULTS
A combination of Treflan, Dacthal, and Lentagran controlled weeds the best. Leaf burning of bok choy by Lentagran eventually disappeared but reduced yields. The herbicides did not cause any other crop injury. Devrinol did not control any weeds.
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Table 55. Herbicide treatments for the 1996 oriental vegetable weed control studies.
| Treatment number | Herbicide(s) | Rate(s) (per acre) | Application timing |
| 1 | Treflan | 1 pt | PPI1 |
| 2 | Devrinol | 2 lbs | PPI |
| 3 | Treflan + Devrinol | 1 pt + 2 lbs | PPI |
| 4 | Dacthal | 8 lbs | PRE |
| 5 | Treflan + Dacthal | 1 pt + 8 lbs | PPI + PRE |
| 6 | Devrinol + Dacthal | 2 lbs + 8 lbs | PPI + PRE |
| 7 | Treflan + Dacthal | 1 pt + 8 lbs | PPI + PRE |
| Lentagran | 2 lbs | POST |
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Table 62. Weed control ratings for the 1996 oriental vegetable weed control study.
| Treatment number1 | Wild buckwheat |
Hairy nightshade |
Black nightshade | Lambs- quarters | Redroot pigweed |
| ----------------------------------------- % control ---------------------------------------- | |||||
| 1 | 83 | 73 | 78 | 60 | 100 |
| 2 | 28 | 73 | 53 | 38 | 80 |
| 3 | 70 | 83 | 70 | 75 | 98 |
| 4 | 58 | 83 | 80 | 80 | 78 |
| 5 | 98 | 83 | 93 | 98 | 95 |
| 6 | 75 | 90 | 80 | 100 | 90 |
| 7 | 93 | 98 | 95 | 100 | 100 |
| LSD (0.05) | 22 | NS | 19 | 13 | NS |
| C.V. (%) | 21 | 15 | 16 | 11 | 13 |
1See Table 55 for treatment definitions.
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Table 63. Number of heads harvested for the 1996 oriental vegetable weed control study.
| Treatment number1 | Daikon radish | Napa cabbage | Pak choi | Crown broccoli | ||
| 1st harvest | 2nd harvest | total | ||||
| ---------------------------------------- 1000s per acre --------------------------------------- | ||||||
| 1 | 51 | 49 | 46 | 7 bc2 | 31 | 38 yz3 |
| 2 | 62 | 48 | 53 | 0 c | 28 | 28 z |
| 3 | 58 | 42 | 52 | 19 ab | 29 | 48 xy |
| 4 | 70 | 52 | 54 | 25 a | 25 | 49 xy |
| 5 | 60 | 55 | 41 | 30 a | 20 | 50 xy |
| 6 | 60 | 55 | 54 | 21 ab | 29 | 50 xy |
| 7 | 49 | 46 | 36 | 26 a | 28 | 54 x |
| C.V. (%) | 31 | 17 | 24 | 59 | 32 | 31 |
1See Table 55 for treatment definitions.
2Values in this column followed by the same letter are not significantly different at the 0.05 level.
3Values in this column followed by the same letter are not significantly different at the 0.10 level.
Columns without letters indicate that there were no significant differences between values in that column.
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Table 64. Yields for the 1996 oriental vegetable weed control study.
| Treatment number1 | Daikon radish | Napa cabbage | Pak choi | Crown broccoli | ||
| 1st harvest | 2nd harvest | total | ||||
| ---------------------------------------------- tons/acre ---------------------------------------------- | ||||||
| 1 | 15.6 | 51.0 a1 | 38.7 ab1 | 1.1 bc2 | 6.5 | 7.6 yz3 |
| 2 | 14.3 | 33.1 b | 25.8 cd | 0.0 c | 4.3 | 4.3 z |
| 3 | 14.5 | 45.0 ab | 36.2 abc | 2.9 abc | 6.0 | 8.8 xy |
| 4 | 18.7 | 44.0 ab | 32.3 a-d | 3.9 ab | 5.6 | 9.5 xy |
| 5 | 20.8 | 51.4 a | 27.3 bcd | 5.4 a | 5.3 | 10.7 xy |
| 6 | 19.3 | 55.6 a | 46.2 a | 3.3 abc | 4.5 | 7.8 yz |
| 7 | 11.1 | 44.9 a | 19.2 d | 5.8 a | 6.3 | 12.0 x |
| C.V. (%) | 29 | 17 | 26 | 66 | 38 | 35 |
1See Table 55 for treatment definitions.
2Values in these columns followed by the same letter are not significantly different at the 0.05 level from the other values in the same column.
3Values in this column followed by the same letter are not significantly different at the 0.10 level.
Columns without letters indicate that there were no significant differences between values in that column.
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Go to Oakes Irrigation Research Site Weed Control Studies
Go to Oakes Irrigation Research Site 1996 annual report