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Såbäddar för vårstråsäd

en stickprovsundersökning

Kritz, Göran (1983). Såbäddar för vårstråsäd. Technical Report. Uppsala: (NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Management, Sveriges lantbruksuniversitet. Rapporter från Jordbearbetningsavdelningen, Sveriges lantbruksuniversitet ; 65

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Poor crop emergence causes significant economic losses to Swedish agricul ture, the most common reasans being drought, crusting, and too deep sowing. In a sampling investigation embracing 300 spring-sown fields distributed all over the country, basic data concerning the properties of the seedbed we re collected. The following praperties were studied: The depth of the seedbed (~ the harrowing depth), the roughness of its surface and battom, the moisture conditions, the soi1 temperature , the aggregate size distribution I the seed placement, and the resulting crop emergence. Particle size distribution and moisture content (by weight) at the matric tensions of l., 1.0 and 1.50 m water column (pF 2, 3 and 4.2 respectively) were determined for the so1.1 from each of the 300 sampling sites. Using multiple regression analysis the influence of the soil composition on the moisture content at the three tensions mentioned was studied. The sampling was done immediately after sowing. The seedbed, normally being 5-6 cm deep, was divided into three sublayers. In each of these / and in a 2 cm thick layer be1ow the seedbed bottom/ the moisture content was determined. The content of plant available water in the who1e seedbed had a maximum, about 5 mm, in soils with about 10 % clay. For soi1s with a clay content above 30 % it: was about 0 mm independent of the clay content. In the 2 cm thick layer below the seedbed bottom there was normal1y 3-4 mm of plant available water. Soil material from each sublayer was sieved into three aggregate fractions, < 2 , 2-5, and > 5 mm, and the aggregate size distribution as a function of the depth and of clay content of the soil was analyzed the relative number of seeds in the three sublayers was determined, and the median sowing depth calcu1ated crop emergence on the sampled sites 2-3 weeks after sowing was estimated and reported by the farmers. Based on the results of the investigation a simple model for suitable sowing depth for cerea1s on different soils under Swedish weather conditions was worked out.

Authors/Creators:Kritz, Göran
Title:Såbäddar för vårstråsäd
Subtitle:en stickprovsundersökning
Series Name/Journal:Rapporter från Jordbearbetningsavdelningen, Sveriges lantbruksuniversitet
Year of publishing :1983
Number of Pages:187
Place of Publication:Uppsala
Publisher:Institutionen för markvetenskap, Avdelningen för jordbearbetning, Sveriges lantbruksuniversitet
ISBN for printed version:91-576-1558-6
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:jordbearbetning, såbädd, stråsäd, textur, markstruktur, markvatten, sådjup, uppkomst
Permanent URL:
ID Code:5019
Department:(NL, NJ) > Dept. of Soil Sciences (until 081001) > Div. of Soil Management
Deposited By: Elisabeth Bölenius
Deposited On:16 Aug 2010 00:00
Metadata Last Modified:02 Dec 2014 10:36

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