soil Flashcards
canker nodules are mostly found in
red soils
process of moving out of sesquioxide from soil is known as
podzolization
process of mixing of soils is known as
pedoturbation
soil having more than 20% of organic matter
organic soils
law of minimum was proposed by
j.v. liebeg
o horizon is absent in which soils
arable soils
top most mineral horizon is
A horizon
diameter of clay particle is
less than 0.002mm
soil structure which is best for cultivatyion is
crumby structure
paticle density of most of the soils is
2.65 g/cc
bulk density of genral soil is
1.33 g/cc
total pore space is highest in
clay soil
koalnite is a type of mineral
1:1 non expanding
montmorillonite is atype of mineral
2;1 expanding type
vermiculite is type of mineral
2:1 limited expanding
chlorites are a type of mineral
2:1:1 type
recently developed soils formed from soil which order that ahs no diagnostic horizon
entisols
black cotton soils are found in
maharashtra
MP
the weight of furrow slice of soil is
2.25 * 10^6 kg/ha
one cm of surface soil over 1 ha of land weight is
150 tonnes
permissible water loss by soil is
12t/ha
chief constitute of sandy fraction is
quartz
most domonant mineral on earths crust is
feldspar
which pulse crop don not fixing N from atmospher
rajma
first manufactured fertilizer in india
SSP
Classification of soils by icar
8 groups
the adverse effect of salinity on plants due to increased
osmotic pressure
apical bud dominance is caused by which hormone
auxin
the crops which absorb the nitrogen in ammonical form directly are
paddy and potato
in rice ammonical fertiklizers shpuld be applied in
reduced zone of soil
