In situ acetylene-ethylene assay of biological nitrogen fixation in lowland rice soils |
| |
Authors: | B V Alimagno T Yoshida |
| |
Institution: | 1. The International Rice Research Institute, Los Ba?os, Laguna, Philippines
|
| |
Abstract: | Summary An in situ device for assaying biological nitrogen fixation in flooded rice soils, using the acetylene reduction method, was developed.
Diurnal variations in acetylene reduction by an inoculated field plot and by laboratory-grown cultures of nitrogen-fixing
algae showed a prominent single-peak pattern of nitrogenase activity. The peak occurred at mid-day for laboratory-grown algae
and at late afternoon for the algae grown in the field plot. Some nitrogenase activity was noted during the night.
Acetylene reduction studies in rice fields of Albay province, Philippines, showed an estimated fixation of 18.5 to 33.3 kg
N/ha each cropping season for the fields of Puro soil and 2.3 to 5.7 kg N/ha each cropping season for the fields of Santo
Domingo soil. re]19751202 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|