mineral and organic nutrient sources/water and air pollution Flashcards
wardle et al- ecosys productivity
decline as progressively lose P
cordell & white, 2014- loss of fert
fert input 18 Mta-1, loose13.9 Mta-1 to non-ag soil and coastal waters
esteller et al- biosolids used as fert
maize yields are as good or better
reduce leaching of N- increase in p
toffey et al, 2020- biosolid use
reduce release of nutrient to fresh water= maintaining quality
reduce use of syn fert= reduce leaching and ghg emissions
nizzetto et al, 2016- slurry appliation
countries with higher use had higher microplastics present in soil
al mamun et al, 2023- soil plastic
plastic in soil threat to human safety
zhu et al, 2018- p avalibility in soil
low avaliability of p in soil for plants- however large stores of p in organic matter
mcdowell et al, 2024- p efficiency
reduce global p use by 56% and n by 60% and get same yield, could up in 28 tonnes per year instead of 57
wang et al, 2024- n use efficiency
n20 from maize annually is 45,000 tonnes, 37,000 for wheat- n use efficiency could reduce emissions by 49%
shewry et al, 2020- barriers to red n use
farmers apply 50 N per hectare extra to achieve level of protein required, than optimal for yield
wang et al, 2021- use of denitrifiers
nitirication inhib- up to 90% reduc of n20 emissions, could breed trait in rice, red eutrophication
austen et al, 2022- use of n fixing symbiosis
legumes and grass clover leys- achieved average yield with 35kg n per hectare compared to over 130 kg
dell et al, 2011- slurry and barriers
slurry injections can reduce n2o emissions but increase leaching
o’connor et al, 2021- anaerobic digestion
use of anaerobic digestion on farms to reduce ch4 emissions and instead convert into a heat and electricity
barriers= finance
