Residual nitrogen effects in organically cultivated beetroot following a Harvested/Green manured grass-clover ley

被引：4

作者：

Gunnarsson, Anita ^{[1
]}

Linden, Borje ^{[2
]}

Gertsson, Ulla ^{[1
]}

机构：

[1] Swedish Univ Agr Sci, Dept Hort, Alnarp, Sweden

[2] Swedish Univ Agr Sci, Dept Soil Sci, Skara, Sweden

来源：

JOURNAL OF PLANT NUTRITION | 2008年 / 31卷 / 08期

关键词：

N dynamics; mixed ley; barley; previous crop; grass-clover ratio; Manova humification coefficient; sandy soil;

D O I：

10.1080/01904160802206190

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The residual nitrogen (N) effect on beetroot following harvested grass-clover (H-ley) or corresponding twice-cut green manure (GM-ley) was compared with a barley control. The residual N at beetroot harvest, calculated as N in beetroot crop and mineral N in the 0-90 cm soil layer, was 83 kg ha-1 for the GM-ley when barley was set to zero. The effect of GM-ley exceeded that of 3H-ley (3 harvests) by 74 kg N ha-1 and 2H-ley (2 harvests) by 42 kg N ha-1. Prediction of residual effects was studied using a model with a humification coefficient (hc) of 0.35 and another with different hc values for different plant materials. The former gave the best fit to observed data in regression analysis. The latter gave the best fit to observed data in absolute values. The residual N effect of GM biomass from summer cuttings corresponded to 40-70% of the potential effect.

引用

页码：1355 / 1381

页数：27

共 26 条

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