task

Plants absorb nitrogen as NH4 + (ammonium) and as NO3- (nitrate). Questions: 1) What is the distribution between NH4 + and NO3- in natural soils and sediments? 2) What are the advantages and disadvantages (at least one for each ion) of NH4 + and NO3 uptake, respectively? 3) What mechanisms can plants utilize to increase nutrient uptake from the soil under conditions of nutrient deficiency and poor nutrient availability? 4) Describe and explain the difference in the mode of transport of PO43- and NO3- in the soil to the roots of the plants.