Question

4. Iron toxicity is a syndrome of disorder associated with large concentrations of iron in the soil solution. It only occurs in flooded soils and hence affects primarily the production of lowland rice.

Answer 1

long are mainly Wey SOLO a) Fe(OH); (a species of pron) compound it's agsociated ions Fets and fetz ions are m responsible for iron - toxicity in soil. was during high flooding situation and during Poor drainage condition. Be cause initially, fetz jon accurs in an i nisoluble form in the secoh); compound when water logging . Stwits and the soil contains enough anaerobic micro-organisma and in this condition, Fe +3 starts to reduce into Fet2 from Fe (OH); compound. And, when the concent ration of fet? is more than 300 - 500 mg/l Then it is supposed to be toxice iron levei in several months onas gyndrom of Water/ soi 1: The PH level reduced to below 5 and the condition may last for severu, causing a multi - nutritional syndrom high toxicity in Low land regions.

b) Fe(OH)e is more resposible for brown stalline Although Pe (04)3 ºg algo regponsible but in legg manner. Because of FECOH) 3. is not easin soluble untill and can legg the water is more acidic. Here, the iron (fe) of FeCOH)? decomposes into Fetz on which reacts with oxygen (O2) to iron oxide (Fe2(03) know as rust it is soluble in water and is teddign brown in colour due to which bath rooms and laundry are red / brown in colour-