Soil temperature during the growth period in winter wheat, spring barley and ley compared with that under a bare soil surface at Ultuna, Sweden.
1989
Rodskjer N. | Tuvesson M. | Wallsten K.
Soil temperature in fields of heavy clay was recorded at Ultuna, 59 min 49 deg N and 17 min 39 deg E. Soil temperature under a bare soil surface is compared to that under stands of winter wheat, spring barley and ley. The development of the stands is described. The crop stands generally affected soil temperature. In summer the soil temperature under bare soil could be considerably higher than under the crop stands. In winter wheat the mean soil temperature at a depth of 20 cm was 1.4 deg C higher than that under bare soil in late May 1975 and 4.4 deg C higher in early August. In spring barley an effect of the stand on soil temperature appeared in the upper soil layer when leaf area index (LAI) was about 1. The lag of an obvious temperature difference between the bare soil and the barley increased with depth. The differences in soil temperature at different depths in the soil are described. In ley observations were performed during the whole vegetation period. Soil temperature under the ley was higher than under the bare soil during the winter. Reverse conditions first appeared in April. During the early summer the bare soil was considerably warmer than the soil under the ley. After the ley was cut a pronouced increase of soil temperature was found. The period around the harvest of the ley is treated in detail.
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