Sentences with phrase «available nitrogen»

For example, bacteria in soil release nitrogen and phosphorus as they break down dead plants, and so these microbes could increase the amount of available nitrogen and phosphorus.

In the nitrogen cycle, some microbes perform an especially important step: the oxidation of nitrite (NO2 −) to nitrate (NO3 −), the dominant form of biologically available nitrogen in the ocean.

In fact, astonishingly, humans have doubled the amount of available nitrogen in the biosphere.

The chief threats to water quality posed by agriculture are: high organic fertilization levels in combination with high stocking rates, the excessive application of mineral N - fertilizers; the lack of a protective soil cover; narrow crop rotations and frequent tillage; high levels of available nitrogen after harvest, and contamination of water with synthetic pesticides.

Using the Nutrient Balance Calculator available on the APL website, we were able to calculate that a system like Jonai Farms (12 sows, 2 boars — total herd size of approximately 110 pigs at any given time on 9ha) where pigs are rotated anywhere from fortnightly to up to two months adds 15 kg N / ha / yr and 6 P / ha / yr, and that just one season of lupins would actually deplete the overall available nitrogen and balance the phosphorous and potassium.

Since the growth of phytoplankton is limited by available nitrogen, and carbon dioxide is central to the growth process, Jones believes that supplying extra nitrogen to phytoplankton would increase the uptake of carbon.

Biologically available nitrogen for agricultural fertilizer has been made since 1906 using the Haber - Bosch process.

These are places where the ocean chemistry is right for iron fertilization, that is, where there is available nitrogen as nitrate or ammonia, and phosphorus.

The researchers tested a variety of solutions containing the soil bacteria Geobacter sulfurreducens and Thiobacillus denitrificans, which thrive by eating acetate (an organic compound that makes vinegar sour) and nitrate (a negatively - charged molecule of biologically available nitrogen and oxygen), respectively, when they can find a spare electron or two.

«While there were hints that plants could use rock - derived nitrogen, this discovery shatters the paradigm that the ultimate source of available nitrogen is the atmosphere.

While essential for plant growth, an over-abundance of this biologically - available nitrogen can result in «nitrogen saturation,» a phenomenon previously reported by Forest Service scientists in Riverside.

Meanwhile, most legumes have a BV of around 45, which means you only gain 45 % of the available nitrogen from legumes versus the 94 % from eggs.

The problem with the tropics is that if tropical surface waters are destined to remain at the surface for a while, they are also probably destined to ultimately scrounge the iron they need, to use the available nitrogen and phosphorus.

Limited direct impacts of atmospheric CO2 on nitrogen - fixation have been found in soil biological crusts (Billings et al., 2003), but soil microbial activity beneath shrubs has been observed to increase, thus reducing plant - available nitrogen (Billings et al., 2002).