i am working on role of different sources of nitrogen in overcoming abiotic stress in plants. Could you provide me best sources of nitrogen in the form of nitrates used by farmers or researchers now a days?
The use of plant growth promoting bacteria and N from organic sources is the best way to reduce the abiotic (edaphic) stress in plant.
If the abiotic stress is related to acid soil condition the feeding with Calcium Nitrate will be effective in increasing the pH lowering the stress for acid environment. In an alkaline environment high carbonate the use of ammonium sulfate will be effective in acidifying the soil root environment adding the ability to remove insolubility of iron or zinc chlorosis. Humic acids can be able to aid in both these conditiona as well as kelp products. The use of compost and earthworm casting are highly effective organic N resources and aid in combating a variety of abiotic and biotic stress. The symbiotic partners of mycorrhizal fungi symbiotic biological nitrogen fixing bacteria and the use of growth promoting microbes are very useful when employed correctly.
Soil pH although so critical is also more than often overlooked. About one quarter to one third of world soils have alkalinity and/or salt issues. The key to getting these soils balanced is getting the pH down and counteracting salt toxicity. The Use of Ammonium sulfate provides key nitrogen and sulfur while lowering the pH the over practice often used is doing some salt dilution and leaching and strategically adding Calcium sulfate which helps to displace excess sodium salt levels competitively. Since salt will accumulate on the surface this can be a case where deep distributing profile tillage along with the leaching and amendments work together with crop rotations which have adapted crops to regenerate the soil situation. As power generation has moved away for coal the atmospheric sulfur is no longer sufficient for optimized crop production in many areas where previously it was a non issue. Soil plant and water analysis is critical for getting plants in balanced enhanced metabolic conditions. Many of our world soil constraints start with too much alkalinity or too much acidity as in the story of Goldilocks the need to get the conditions just right.
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