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Djupplöjning på lätta mineraljordar

Rydberg, Tomas and McAfee, Mary and Gillberg, Börje (1990). Djupplöjning på lätta mineraljordar. Technical Report. Uppsala: (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Management, Sveriges lantbruksuniversitet. Rapporter från Jordbearbetningsavdelningen, Sveriges lantbruksuniversitet ; 80

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The effect of a single deep ploughing to 35 and 50 cm depth on subsequent crop yields on sandy soil was investigated in a series of 5-6 year experiments on 14 Swedish sites. Root depth was restricted to the topsoil on all sites prior to treatments, and the sand type was coarse (0.6-2.0 mm) on 1 site, medium (0.2-0.6 mm) on 7 sites and fine (0.06- 0.2 mm) on the remaining 6 sites (Table 1). The effect of an additional 30 kg N/ha fertilizer was investigated as a secondary treatment. Ploughing to 35 cm depth improved yields relative to the normal ploughed control by on average 4% (Table 6). However, this positive effect was greatest in years 1-3 and had disappeared within 5 years. Ploughing to 50 cm depth had on the whole no or a somewhat negative effect compared to normal ploughing (Table 7). Positive results were obtained on the coarser sands, and on all sands in dry years. In wet years, however, there were indications of aeration problems in the ploughed-in topsoil on fine sands. Root studies showed that rooting depth was on average 5-15 cm greater on soil which had been ploughed to 50 cm. Where positive effects were obtained, they were obviously due to increased water availability to the crop. The negative effects observed were probably due to aeration problems on fine sands and more particularly to soil recompaction during secondary tillage after the deep ploughing treatment. The reduction in organic matter content of the topsoil due to its mixing with the subsoil was likely to have increased the sensitivity to compaction of these sandy soils. The application of an extra 30 kg N/ha improved yields by 6-7% at all 3 ploughing depths investigated. Thus there was no additional advantage in fertilizing deep-ploughed plots despite the fact that nutrient availability was somewhat lower on these (Table 4). There was a difference between crops in their response to deep ploughing. Oats showed a positive yield response of 12%, while potatoes showed a negative yield response of 10% (Fig. 3). The effect of incorporating 500 m3/ha raw bark into the topsoil after ploughing to 50 cm was investigated on one site (Vinberga). After an initial year of very low yield, this treatment gave a large positive effects on yield, presumably as a result of improved soil structure. It was concluded from this series of experiments that deep ploughing was not an economically justifiable soil improvement treatment, since better and more consistent results could be obtained by fertilizing combined with normal ploughing. In very dry areas or on coarse sands water availability could be improved more reliably by irrigating than by deep ploughing.

Authors/Creators:Rydberg, Tomas and McAfee, Mary and Gillberg, Börje
Title:Djupplöjning på lätta mineraljordar
Series Name/Journal:Rapporter från Jordbearbetningsavdelningen, Sveriges lantbruksuniversitet
Year of publishing :1990
Number of Pages:50
Place of Publication:Uppsala
Publisher:Institutionen för markvetenskap, Jordbearbetningsavdelningen, Sveriges lantbruksuniversitet
ISBN for printed version:91-576-4178-1
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:jordbearbetning, djupplöjning, mineraljord, skördeökning, rotstudier, vattentillgång, mullhalt, återpackning, kvävegiva
Permanent URL:
ID Code:5034
Department:(NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Management
Deposited By: Elisabeth Bölenius
Deposited On:19 Aug 2010 00:00
Metadata Last Modified:02 Dec 2014 10:36

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