Dinitrogen fixation — acetylene reduction in soybeans during the reproductive growth period

1978 ◽  
Vol 20 (3) ◽  
pp. 210-216 ◽  
Author(s):  
V. Škrdleta ◽  
V. Našinec ◽  
Alena Hyndráková ◽  
Marie Němcová
Keyword(s):  
Acetylene Reduction ◽  
Growth Period ◽  
Dinitrogen Fixation ◽  
Reproductive Growth

Nutrient uptake and partitioning by zucchini squash, head lettuce and potato in response to nitrogen

1992 ◽  
Vol 43 (7) ◽  
pp. 1653 ◽  
Author(s):  
DO Huett ◽  
EB Dettmann
Keyword(s):  
Nutrient Uptake ◽  
Solanum Tuberosum L ◽  
Growth Period ◽  
Sand Culture ◽  
Reproductive Growth ◽  
Plant Parts ◽  
Whole Plant ◽  
Quadratic Response ◽  
N Deficiency ◽  
Uptake Data

The effect of N application level on uptake and partitioning of nutrients by zucchini squash (Cucurbita pepo L.) cv. Blackjack, head lettuce (Lactuca sativa L.) cv. Monte110 and potato (Solanum tuberosum L.) cv. Sebago was investigated in sand culture experiments with a stable nutrient supply. Plants were grown during 14 (zucchini squash), 8 (lettuce) and 12 weeks (potato). Five nitrate N levels ranging from 2-36 mol m-3 for lettuce and 2-43 mol m-3 for zucchini squash and potato were applied in a complete nutrient solution. Gamma x quadratic response surface models fitted actual nutrient uptake data (R2> 0 . 9 5 ) . From these models, predicted nutrient uptake, partitioning of nutrients between plant parts and nutrient uptake rates were derived. Nitrogen had a pronounced effect on nutrient uptake of all species. The maximum predicted whole plant (excluding roots) uptake of N and K (parenthesis) was calculated (mol m-3 N) for zucchini squash (19.3, 17.7), lettuce (16.5, 12.1) and potato (12.7, 11.2) respectively. An N deficiency (2 mol m-3)did not result in remobilization of nutrients from vegetative to reproductive growth for zucchini squash and potato. Remobilization of N and K from outer leaves to head occurred for lettuce over the last week of the growth period at all N levels. An N deficiency increased partitioning of N and K by 36 and 54% respectively to reproductive growth for zucchini squash compared with adequate N for fresh yield (14 mol m-3), whereas an N deficiency had a negligible effect on partitioning to reproductive growth for potato. Partitioning, as measured by the ratio of nutrients in fruit, head or tuber to whole plant increased over the growth period, and at final harvest, partitioning was lowest for Ca (0.22-0.24 zucchini squash, 0.21-0.32 lettuce and 0.03-0.09 potato) and highest for K (0.39-0.60 zucchini squash, 0.59-0.68 lettuce and 0.63-0.86 potato). Potato tubers and lettuce head, in contrast to zucchini squash fruit, were dominant sinks for N, K and P.

Dinitrogen fixation (Acetylene reduction) and nitrogen accumulation in peas cultivated under the standard growth conditions

1993 ◽  
Vol 38 (3) ◽  
pp. 229-234 ◽  
Author(s):  
V. Škrdleta ◽  
M. Němcová ◽  
L. Lisá ◽  
K. Novák
Keyword(s):  
Acetylene Reduction ◽  
Growth Conditions ◽  
Dinitrogen Fixation ◽  
Nitrogen Accumulation

Comparisons of nitrogen fixation estimates in soybeans by nodule weight, leghemoglobin content, and acetylene reduction

1973 ◽  
Vol 19 (9) ◽  
pp. 1165-1168 ◽  
Author(s):  
H. S. Johnson ◽  
D. J. Hume
Keyword(s):  
Nitrogen Fixation ◽  
Glycine Max ◽  
Acetylene Reduction ◽  
Growth Period ◽  
Growing Season ◽  
Field Conditions ◽  
Soybean Cultivar ◽  
Fresh Weight ◽  
Stages Of Development ◽  
Glycine Max L

Nodule leghemoglobin content, acetylene reduction rates, and nodule weight determinations were made during an entire growth period of soybean (Glycine max (L.) Merr. cv. Altona) plants grown under field conditions. High correlations within most sampling dates were found between each pair of possible comparisons of these indicators of nitrogen fixation.Rates of conversion of acetylene to ethylene per milligram leghemoglobin constantly decreased during the growing season, whereas leghemoglobin content per gram nodule fresh weight remained relatively constant. These results indicate that leghemoglobin content of nodules could be used to compare rates of nitrogen fixation in plants of a soybean cultivar at similar stages of development but should not be used to compare fixation rates in plants at different stages in ontogeny.

Dinitrogen fixation by surface peat and Sphagnum in an ombrotrophic bog

1982 ◽  
Vol 60 (5) ◽  
pp. 538-543 ◽  
Author(s):  
Rachel R. Chapman ◽  
Harold F. Hemond
Keyword(s):  
Acetylene Reduction ◽  
Dinitrogen Fixation ◽  
Bulk Precipitation ◽  
Ombrotrophic Bog ◽  
Eastern Massachusetts ◽  
Surface Peat

Annual dinitrogen fixation at the surface of ombrotrophic Thoreau's Bog in eastern Massachusetts, U.S.A., is estimated at 1.0 g N∙m2. The rates of acetylene reduction are lower but still significant in the dark, suggesting that fixation is carried out both photosynthetically and heterotrophically. The ratio 15N2 fixed: C2H2 reduced was 1 mol: 3.5 mol in in vitro calibration experiments. Dinitrogen fixation is ecologically important in this bog as it exceeds the only other known input of nitrogen, namely deposition of NO3− and NH4+ in bulk precipitation.

scholarly journals Relación entre la precipitación pluvial y el crecimiento secundario en amaranto (Amaranthus hipochondriacus L.)

2016 ◽  
Vol 8 (2) ◽  
pp. 127
Author(s):  
José S. Barrales
Keyword(s):  
Secondary Growth ◽  
Growth Period ◽  
Reproductive Growth ◽  
Sowing Dates

In Chapingo, Mex. (Ll) and Cuapiaxtla, Tlax. (L2) in México, secondary growth in amaranth was evaluated in relation to the amount of rain during the reproductive growth period (GRP). 10 types of amaranth were evaluated in three sowing dates in L1 and 2 sowing dais in L2 in 1994. In general for all types of amaranth, when the rain was 289.7 mm during GRP, 82.8% of plants showed secondary growth; with rain of 225.2 mm during GRP, 74.2% of plants presented secondary growth; meanwhile with 162.1 mm of rain during GRP, secondary growth affected only 4.2% of plants. Finally, in L2 the rain in GRP was 118.2 mm without the presence of secondary growth.

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