Biomass production and weed control in some winter cover crops in Hokuriku district [Japan]
2007
Araki, H.(Niigata Univ. (Japan). Faculty of Agriculture) | Hatano, Y. | Horimoto, S. | Fujii, Y. | Ito, M.
For the purpose of introduction of cover crops into summer crop production in the Hokuriku district, grass (wheat, barley, rye and bristle oat), legume (hairy vetch, HV; common vetch, CV; milk vetch, MV; crimson clover, CC) and Brassica (rape) cover crops were sown in October of 1998 and 1999, and above-ground biomass (AGB) in the following spring and weed control effect were observed at the University Farm of Niigata University. A large amount of AGB (646 kg DW and 591 kg DW per 10a in rye and in HV, respectively) was provided as organic matter to the field. In particular, nitrogen content of HV was 4.2% (DW) and approximately 24kg/10a organic N was supplied to the field grown HV. After mowing, although HV residue covered the ground surface completely, ground surface cover by residue of other cover crops was insufficient. Suckering occurred from the stubble of rye, and living mulch was formed by seed germination on the ground surface in wheat, barley and CC. These cover crops should be mowed earlier for residue mulch formation.
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