Soil Final wk 13

17 cards·by tristanscards

what are the three components of soil O.M.?

humus, living material, nonliving material

what are the 4 fates of mineral;ized plant nutrients?

removal by plant uptake, volatilization, fixation, immobilization

what functions does soil OM perform in soil?

binds into aggregates more water hilding capacity more nutrients

C:N ratio thats dividing line between N immobilization and mineralization

20-30-1

Organic compounds foud in soils: easiest breakdown

simple protein amino acid sugar

Organic compounds foud in soils most resistant

ligmind polyphenols

Organic compounds foud in soils: intermediate break down

starches fats waxes cellulose

soil has 3.1% carbon, whats OM?

6.2%

soil has 6.2% OM, whats carbon?

3.1%

3 things causing changes in OM content

oxidation temperature precipitation

what practices are important when managing soil OM?

tillage and drainage means more OM

3 functions of nitrogen in plants

1- clorophil-> photosynthesis 2- amino acids-> proteins 3- growth in cellulose

what is chlorosis?

loss of green coloration due to iron defficiencies +nitrogen

visual symptom of N deficiency

G to Y to B leaves

2 plant available forms of nitrogen in soil solution

Nitrate NO3 and Ammnium NH4

Where is the largest amount of total soil nitrogen found in soils

2 types of fixation that occur with nitrogen

atmostpheric, adsorption