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
RASPBERRY
PRELIMINARY TRIAL
Richard G Greenland, Leonard Besemann, and Heidi Kerlin
Table 72. Yield and size of raspberries.
MATERIALS AND METHODS
This study was established in 1992 on a Maddock sandy loam soil that had been in fallow (or weeds) the previous two years. Spring soil tests showed this site to be high in K, medium in P and low in N. The soil pH was 7.8 and the soil organic matter was 1.3%. The area was disked in the spring of 1992 and 200 lbs of 10-50-0 per acre were incorporated using a multiweeder on April 9.
Three varieties of fall raspberries were planted on 9 April 1992. Raspberry plants were placed 1 ft apart in rows 7 ft apart. Planting was done by digging a 4-inch deep furrow, adding water, and burying the plants as deep as they were at the nursery. Plants were clipped at ground level about one month after planting (it is recommended they be clipped sooner). An additional 33 lbs N per acre as urea was banded along each row on 21 July 1992. All plants grew vigorously the first year with only a couple of plants being lost. Redwing was the most vigorous and Autumn Bliss the least vigorous.
In 1998, plants were flailed between March 27 and April 3, just as soon as the snow melted off each area. Weeds were controlled with Sinbar (2 lbs/acre on April 14 (which was before the raspberries emerged)) and by rototilling between rows. The raspberries were irrigated as needed throughout the summer. Harvest began on August 11 for Redwing and Autumn Bliss, and on August 17 for Heritage. A 10-ft section of row from each variety was harvested.
Red Wing continued to yield better than the other two varieties of raspberries. It was also the most vigorous and best adapted to North Dakota conditions. Red Wing had smaller berries and a strong raspberry flavor. Autumn Bliss seemed to be the least adapted to North Dakota conditions. We are losing some stand. Autumn Bliss has the largest berries and a milder, almost watery, taste. Heritage is the latest maturing of the varieties. Yield is often reduced because the berries don't mature before frost.
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Table 72. Yield and size of raspberries at the Oakes Irrigation Research Site, 1998.
| Harvest Date | Yield | Size | |||||
| Autumn Bliss | Heritage | Red Wing | Autumn Bliss | Heritage | Red Wing | ||
| -------------- lbs/acre ------------ | ------- grams/100 berries ------- | ||||||
| 11-Aug | 257 | 0 | 212 | 260 | --- | 276 | |
| 17-Aug | 717 | 100 | 1379 | 190 | 216 | 229 | |
| 21-Aug | 785 | 218 | 1438 | 234 | 189 | 190 | |
| 26-Aug | 1036 | 733 | 1357 | 282 | 197 | 186 | |
| 28-Aug | 401 | 373 | 715 | 245 | 202 | 175 | |
| 31-Aug | 492 | 602 | 720 | 241 | 200 | 163 | |
| 07-Sep | 401 | 749 | 482 | 181 | 167 | 128 | |
| 14-Sep | 240 | 593 | 209 | 141 | 155 | 131 | |
| Totals | 4329 | 3368 | 6511 | Avg. | 223 | 182 | 183 |
Note: no statistics were done on these data because it was not a replicated trial.
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Go to Oakes Irrigation Research Site Variety Performance Trials
Go to Oakes Irrigation Research Site 1998 annual report.