Jadam organic Farming & Gardening : The Way to Ultra-Low-Cost Agriculture, Make All-Natural Fertilizer, Pesticide and Microorganism Inputs Yourself

Chemicals accumulate in surface soil due to soil compacion 
If antibiotics, chemical pesticides, herbicides and fertilizers that are used
every year were diffused and decomposed in soil, the problem would not be as
serious. Unfortunately, the fact is that they actually accumulate in the 15 cm (6
in) belt below the surface because of a layer of compacted soil. Use of heavy ma-
chinery is a direct cause of soil compaction. Tractors are the main culprit. e
heavy wheels of a tractor press down on the soil and their effect can be meas-
ured as deep as 7 meters (23 ft). Repeated use of heavy vehicles turns the soil
ULC영어본문.qxp_레이아웃 1 2016. 2. 19. 오후 6:39 페이지 86

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Soil Management
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layer at 15 cm (6 in) depth rock-hard. Because of this compacted soil layer, the
agricultural chemicals cannot penetrate deep into the soil and enter a break-
down cycle. Instead they will linger at the 15 cm (6 in) sub-surface level after
water has evaporated. is residue is highly detrimental to crop roots. JADAM
recommends you to stop using heavy tractors but use light vehicles instead and
minimize the use of chemical material. Come down from the heavy machines.
If you have to use tractors, then take the extra care so that the wheels will not
run over crop-growing area.