Land Draining: A Handbook for Farmers on the Principles and Practice of Farm DrainingOrange Judd Company, 1903 - 199 páginas |
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absorb agriculture ammonia atmosphere average barley bottom bushels capillary water carbonic acid cent chlorophyll clay Columella conservation of energy Deanston defects depth diminished discharge distance ditch drain-gauges drainage and evaporation drainage water drained soil draining scoop draining spade drouth earth estimated excavation experiments fall farm crops farm drainage farmers field gauge Gisborne growing crops growth heat hygroscopic improved inches increased joints July junction laid laying the tiles laying tiles less lupines Maubeuge measuring rod methods microbes moisture months nitrification nitrogen nutrition obstruction obtained one-half outlet percolate pipe tiles plant food porosity potential energy pots practical processes quartz sand quicksand rain rainfall readily retentive soils roots of plants Rothamsted round tiles season secure shears silt six inches soil metabolism summer supply system of draining temperature three feet tile drains tillage tion trench water surface water table wheat