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Influence of straw and CO2 on N2-fixation and yield of field-grown soybeans
49 (2): 259--266 (1978)
DOI: 10.1007/bf02149735
Аннотация
Straw incorporation at 2 and 4 t/ha with or without CO2-enrichment at 1000 mg/l from flowering to pod development stage in open top chambers markedly influenced the N2-fixation and yield of field grown soybeans. N2-ase activity of soybean root nodules as determined by acetylene reduction technique indicated that (1) straw on average gave significantly 141 and 197\% higher N2-ase activity at 2 and 4 t/ha respectively than controls; (2) CO2 treatments on average increased the activity by 24\% over those without CO2 and (3) 4 t/ha straw alone or straw at 2 or 4 t/ha in conjunction with CO2 increased the N2-ase activity four-fold over the control. High correlations were observed between fresh weights of nodules and N2-ase activity and between fresh weights of nodules and yield and between N2-ase activity and yield. This study confirms the earlier investigation that straw could be considered to provide a partial substitute for expensive CO2-enrichment treatment for improving N2(C2H2) fixation and thereby the general growth and yield of crops.
