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Stickstoffentnahmen in einem italienischen Ray‐grass nach Zerstörung der nicht fruchtbaren Brachfeldbodendecken
Author(s) -
Clotuche P.,
Peeters A.
Publication year - 2000
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1046/j.1439-037x.2000.00355.x
Subject(s) - plough , perennial plant , agronomy , red clover , nitrogen , crop rotation , mathematics , crop , biology , chemistry , organic chemistry
The introduction of the European set‐aside into the rotation can modify the nitrogen availability for subsequent crops. With a view to evaluating this effect, three non‐fertilized covers were sown in May 1995. These covers were ploughed in at three different times: October 1995, December 1995 and March 1996. The ploughed‐in nitrogen quantities did not vary greatly with destruction time. The greatest quantities were incorporated into red clover plots and the smallest quantities into perennial ryegrass plots. The C/N of perennial ryegrass was on average 24 and that of red clover 14. The soil cover by clover just before ploughing is significantly related to the ploughed‐in nitrogen quantities. An Italian ryegrass was sown as the subsequent crop to the set‐aside. Overall, during the whole year 1996 and 1996–1997, there was no difference between the yields for different destruction times except for the first cut of 1996. The highest production was obtained after red clover and the lowest after perennial ryegrass. The relationship between the nitrogen amount or C/N of the ploughed‐in material and the nitrogen export for the annual harvest of Italian ryegrass showed highly significant correlations in 1996 as well as for the 2‐year harvest. Two multiple regressions were calculated in order to take into consideration the characteristics of the ploughed‐in material of the set‐aside. The measured percentage of soil cover by clover before ploughing and the annual nitrogen export of Italian ryegrass were also significantly related in 1996 and for both years.