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- In geology and particularly in sedimentology, a nodule is a small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition from the enclosing sediment or sedimentary rock.
en.wikipedia.org/wiki/Nodule_(geology)
In geology and particularly in sedimentology, a nodule is a small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition from the enclosing sediment or sedimentary rock.
Examples include andic soil properties, episaturation, and identifiable secondary carbonates. A significant number of the terms included in this glossary are words that can be found in a common dictionary, but that have specific unique meanings in the context of soil survey and soil classification.
- Pulse Crops
- Nitrogen Fixation
- Inoculation
- Fertilizer and Inoculation
- Dry Bean - Fertilizer and Inoculation
- Checking Nodulation
- Failure of Nodulation
- Causes of N Fixation Failure
- Inoculant Formulations
- Inoculant Strain
Pulse crops are annual grain legumes that produce large seeds traditionally used for human food or livestock feed. The pulse crops grown in Saskatchewan include: pea, lentil, chickpea, faba bean, dry bean, soybean, chickling vetch (grass pea) and lupin. Pulse crops have the ability to obtain much of their nitrogen requirement from the air within th...
Nitrogen (N) fixation is the process whereby legume crops and specific Rhizobiumbacteria (rhizobia) work together to make nitrogen from the soil air surrounding the roots available for use by the plant. Soon after the crop germinates, rhizobia enter the root hairs. Once inside, the bacteria penetrate further into the root through an infection threa...
Products containing Rhizobium bacteria are called nitrogen inoculants. Inoculation is the process of introducing the appropriate Rhizobium bacteria to the soil in numbers sufficient to ensure successful nodulation. This is done by coating the seed with a liquid or peat-based powder inoculant, or by treating the soil with a granular or liquid inocul...
A soil test is the best tool to provide guidelines for crop fertility needs. Pulse crop seedlings use nitrogen from the top 15-30 cm (6-12 in.) of the soil until nitrogen fixation starts. Nitrogen below this depth will not be available to small seedlings. Nitrogen fixation may take three to four weeks to become well established. Nitrogen is necessa...
Generally, dry beans are poor fixers of nitrogen in comparison to pea, lentil, faba bean, and chickpea. Research completed on inoculated dry bean by the University of Saskatchewan and Agriculture and Agri-Food Canada (AAFC), Morden Research Station, indicated that there is a positive yield response to the application of starter nitrogen at rates of...
Nodule formation may begin approximately two weeks after crop emergence, but will likely take three to four weeks under most growing conditions. The number of nodules and rate of fixation will increase as the plant grows, and normally reaches a maximum at the mid-flowering stage to correspond to the time when the plant needs the most nitrogen. Afte...
If careful inspection of the pulse crop root reveals little or no nodulation, inoculation may have been ineffective because of adverse conditions such as dry topsoil. If the field has a history of the same pulse crop, residual Rhizobium bacteria present in the soil may initiate enough nodulation to meet nitrogen requirements for a moderate yield. I...
Nitrogen fixation is a biological system that requires the plant and Rhizobium bacteria to work in balance. Conditions that cause nitrogen fixation failure include: 1. Using the wrong species of Rhizobium for the crop seeded, or using inadequate rates of inoculant. Calibrate seeding equipment using inoculated seed as it may have slower flow rates t...
Peat based powder - a fine powder containing a specific number of Rhizobium bacteria per gram. An additional solution is used to stick the inoculant directly to the seed. Commercial sticker product...The sticker should be dribbled or sprayed onto the surface of the seed. After the seed is moistened, the inoculant is applied following the manufacturer's instructions. Small amounts of seed can be...Peat based powder with pre-formulated sticker - a fine powder with the sticker already added. The inoculant must be applied directly to the seed by shaking it from the bag onto the seed as it is be...Liquid based - the liquid inoculant is applied directly to the seed as it is being augered. Empty the auger to avoid inoculant build-up. Research at AAFC Brandon and AAFC Indian Head investigated t...Inoculants are available in either mixed-strain or single-strain formulations. Mixed-strain inoculants may contain bacteria effective in initiating nitrogen fixation in more than one pulse crop or may contain two or more strains specific to a single pulse crop. An example of a mixed-strain inoculant is a product that is very effective in both pea a...
- Agriculture Knowledge Centre
Soil structure refers to the aggregation of primary soil particles into compound particles that are separated from adjoining aggregates by surfaces of weakness. Soil structure is classified in terms of grade or distinctness (weak, moderate, strong), class or size (fine, medium, coarse, very coarse), and type (granular, platy, prismatic, blocky).
Nodule, rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs. Nodules commonly are elongate with a knobby irregular surface; they usually are oriented parallel to the bedding. Chert and flint often occur as dense and structureless nodules of.
- The Editors of Encyclopaedia Britannica
Jan 19, 2017 · A few long-destroyed buildings would explain the presence of limestone nodules in the soil while saying nothing about the bedrock. The point is there are many possible sources of limestone that are not the underlying bedrock.
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Jan 24, 2022 · The first sign you notice may be wilting or discolored leaves. Fungal diseases are categorized based on type: root rot, cankers, foliar/shoot, and wilts. Cankers, specifically, can appear as a growth on your tree after fungus enters through a wound in the bark.
