preview

Soil Moisture Lab Report

Decent Essays
Soil moisture also affects the yield and competitiveness of the introduced strain. Cowie et al. (1996a, b) reported that waterlogging at any time have an adverse effect on the seed yield. Drought conditions severely affect the viability of different species and strains of rhizobia (Joshi et al., 1981; Osa-Afiana and Alexander, 1982). Singh et al. (1992) reported that at a available soil moisture of 45 per cent nodule number and dry weight of nodules increased while at 30 per cent available soil moisture, seed yield increased. Strains isolated from arid areas are more tolerant to dessication and high temperature than strains isolated from cooler and wet region. Bitorrini and Beringer (unpublished, cited by Dowling and Broughton, 1986)…show more content…
(1997)
Calcium carbonate Increase in nodule weight Almendras and Bottomley (1985)
Trace elements Zinc
Iron
Molybdenum
Boron Increase in nodulation Kumpawat and Manohar (1994) Bhuiyan et al. (1998)
Sonboir and Sarawgi (1998)
Cadmium Inhibits nitrogen fixation Mario et al., 2013

Almendras and Bottomley (1985) also concluded that there was a correlation between pH and phosphorus application. Phosphorus limitation was exacerbated by low pH and the combination of pH and phosphorus levels could have strong influence on competition for nodulation.
Iron plays an important role in micro-organisms and plants. This is a component of cell and its deficiency can cause growth inhibition, sporulation, decrease in RNA and DNA synthesis and, can also change the cell morphology. Iron exists in two states (Fe2+ and Fe3+) and therefore, it is suitable as an electron transporter. Iron is also known to regulate the bio-synthesis of porphyrins, toxins, vitamins, antibiotics, cytochromes, pigments, siderophores and aromatic compounds. Iron is present as a cofactor or required by different enzymes and proteins such as peroxidase, superoxide dismutase, nitrogenase, hydrogenase, glutamate synthase, rhibonuclotide diphosphate reductase, aconitase, DAHP, synthatase, cytochromes, ferridoxin and flavoproteins. Iron storage protein like ferritin in animals and bacterio-ferritin in micro-organisms have also been discovered (Stiefel and Watt, 1979).
Although iron is
Get Access