. Soils and fertilizers . Fig. 16. — Cross sections of two soils, a sandy loam and a clay, both ofwhich have drain tiles laid at right angles to the sections. Owing to themore rapid movement of water through the sandy loam, the tiles are laidtwice as far apart as they are in the clay. They are also deeper in the formersoil. The water gradient is steeper in the clay. The tiles should be suf-ficiently close together to keep the water table below the plowing line. be placed. The position of the water level between drainsis shown in Fig. 16. Ditches may be dug or partly dug by means of spades,ditc
. Soils and fertilizers . Fig. 16. — Cross sections of two soils, a sandy loam and a clay, both ofwhich have drain tiles laid at right angles to the sections. Owing to themore rapid movement of water through the sandy loam, the tiles are laidtwice as far apart as they are in the clay. They are also deeper in the formersoil. The water gradient is steeper in the clay. The tiles should be suf-ficiently close together to keep the water table below the plowing line. be placed. The position of the water level between drainsis shown in Fig. 16. Ditches may be dug or partly dug by means of spades,ditching plows or traction ditchers. The last named, while Trie Elements or Soil Water Control WATER CONTROL MOISTURE CONSERVATION DRAINAGE WILTING POINT : r~ \ OPTIMUM 501L MOISTURE \ UNAVAILABLE t AVAILABLE WATER WATER MAXIMUM CAPILLARY CAPACITY 5URPLUSWATER Fig. 17. — Diagrammatic explanation of water control in a humid the one hand we have drainage reducing the surplus water to the maxi-mum capillary water c
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