topic 8

Question 1

what makes good soil fertility

Answer 1

good drainage but can retain water
needs macronutrients
air content-increase aerobic respuration
pH-5.5-7-ions are not too soluble or insoluble
soil biota-detritivores+n bacteria+fungi
deeper soils-less likely to be waterlogged

Question 2

difference between sandy and clay soils

Answer 2

drainage rate
aeration-clay waterlogge
root pentration

Question 3

human activities affecting soil fertility

Answer 3

ploughing -more aerobivc
irrigation-plants can keeps stomata open when its dry season
soil compaction-high livestock densities
ph control-make sure nutrients arent too soluble

Question 4

soil erosion types

Answer 4

rain splash
surface run off erosion
slumping and landslides-increased lubrication

Question 5

how does vegetation reduce soil erosion

Answer 5

windbreak-reduces wind velocity
cover-for rain drops
hold soil together

Question 6

human activites that increase soil erosion

Answer 6

vegetation removal
ploughing vulnerable soil
soil compaction
cultivating steep slopes

Question 7

effects of accelerated soil erosion

Answer 7

desertification
sedimentation

Question 8

methods to reduce soil erosion

Answer 8

rows of stones-slows run off
long term crops
multicropping–90 edgrees to prevailing wnid
contour ploughing-ploughing 90 to the slope-reduces surface run off velocity
zero tillage-direcct drilling of seeds
long terem rops
livetsock managemnt