home    about    browse    search    latest    help 
Login | Create Account

Root growth and nitrogen uptake of carrot, early cabbage, onion and lettuce following a range of green manures

Thorup-Kristensen, K. (2006) Root growth and nitrogen uptake of carrot, early cabbage, onion and lettuce following a range of green manures. [Rodvækst og kvælstofoptagelse hos gulerod, tidlig kål, løg og salat efter forskellige grøngødningsafgrøder.] Soil Use and Management, 22, pp. 29-38.

[img] PDF
Limited to [Depositor and staff only]

465Kb

Summary

An experiment was performed to study the significance of rooting depth of four vegetable crops on their utilization of green manure nitrogen (N). Rates of rooting depth development were estimated as approximately 0.2, 0.7, 1.2 and 1.2 mm day C)1 for onion, carrot, lettuce and cabbage, respectively. At harvest, onion and lettuce were found to be shallow-rooted with final rooting depths of only 0.3 and 0.6 m, respectively, whereas carrot and cabbage reached rooting depths of at least 1.1 m. The two deep-rooted vegetables increased their N uptake by 46, 24 and 7 kg N ha)1 when following winterhardy
legumes, non-hardy legumes and rye, respectively; the equivalent responses by the two shallowrooted crops were 23, 9 and 15 kg N ha)1, respectively. Thus the deep-rooted crops used the legume N more efficiently but the shallow-rooted crops made better use of N left by the non-legume rye crop. These interactions between green manure type and vegetable crop N response are the result of the dual effects of the green manures: biological N fixation by the legumes, and the variable ability of the green
manure crops to concentrate available N in the topsoil. Before shallow-rooted crops, the ability of rye to concentrate N in the topsoil may be as important as the N fixing ability of legumes.


EPrint Type:Journal paper
Keywords:Green manures, carrot, cabbage, onion, lettuce, rooting depth, nitrogen use efficiency, organic production, cover crop, rooting depth, hairy vetch, common vetch, crimson clover, Egyptian clover, ryegrass, rye
Subjects: Crop husbandry > Production systems > Root crops
Crop husbandry > Production systems > Vegetables
Environmental aspects > Air and water emissions
Crop husbandry > Composting and manuring
Research affiliation: Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops
Denmark > DARCOF I (1996-2001) > II.2 Vegetables
Deposited By: Thorup-Kristensen, Professor Kristian
ID Code:7903
Deposited On:04 Apr 2006
Last Modified:27 Apr 2013 15:30
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page