A Bioeconomic Solution for Replacing Chemical Fertilizers by Organic Processes for Atmospheric Nitrogen Fixation in Soil
Large-scale use of nitrogen-based chemical fertilizers, specific to intensive agriculture, has undesirable effects consisting of soil degradation and atmospheric loading with carbon dioxide. Good practice illustrates, however, that sustainable agriculture can be achieved by substituting as much as...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editura ASE
2018-05-01
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| Series: | Amfiteatru Economic |
| Subjects: | |
| Online Access: | http://www.amfiteatrueconomic.ro/temp/Article_2734.pdf |
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| Summary: | Large-scale use of nitrogen-based chemical fertilizers, specific to intensive agriculture, has
undesirable effects consisting of soil degradation and atmospheric loading with carbon dioxide. Good
practice illustrates, however, that sustainable agriculture can be achieved by substituting as much as
possible chemically synthesized nitrogen with biologically fixed nitrogen.
This research is part of a study cycle that aims to use the natural symbiotic fixation models to bring
into the soil and plants as much as possible atmospheric nitrogen, non-polluting, antioxidant and
generator of humus and durability. We had work with a pea culture, seated in a rotation of 4 years the
type pea, wheat-rape, maize, and we watched at three parameters of the symbiotic fixation between
peas with species Rhizobium leguminosarum.
The experiments were carried out in two locations in southern Romania (Burnas Plain - on the Plateau
of Alexandria, and in the Southern Plain - Modelu, Calarasi) and the results were:
• in dynamics the nodosities begin to form at 22-24 days after sowing, their number increases
accentuated until the 37 days of life, after which it decreases slightly until the 70th day. The maximum
number of nodosities on roots reaches a number of 57-58 per plant. The life of a nodosity is not
longer than 10 days;
• the weight of dry nodosities is on the peak of biological activity higher at Modelu (5.8 g/m2) at
38 days after sowing, and less in Alexandria (4.1 g/m2) at 37 days after sowing (Figure no. 2 in-text);
• starting from the weight of the nodosites and using their transformation coefficient in the N
(nitrogen) active substance (which is 4.6), and using the functional analysis of the correlations and
integral calculations, the dynamics of nitrogen accumulation in the form of a high precision
polynomial function (order 14) was obtained (figure no. 3 in-text), which tells us that: the highest
amount of nitrogen is obtained on day 41 after sowing in the amount of 6.52 Kg N active
substance/ha. Cumulative calculation obtained through the integral function the total and average
quantity obtained for the two locations in 2016 – 2017 was about 116 kg N/ha (1). |
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| ISSN: | 1582-9146 2247-9104 |