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Fertilizing the Subsoil for Better Water Utilization
Author(s) -
Kohnke Helmut,
Bertrand A. R.
Publication year - 1956
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1956.03615995002000040031x
Subject(s) - subsoil , surface runoff , human fertilization , agronomy , environmental science , soil water , fertilizer , moisture , erosion , water content , soil science , geology , biology , chemistry , geotechnical engineering , ecology , paleontology , organic chemistry
Subsoil fertilization experiments were conducted on several Indiana soils. The fertilizer was applied in vertical bands from 7 to 20 inches deep. The distance between the bands varied between 28 and 48 inches. The growth of corn roots greatly increased as a result of subsoil fertilization; subsoiling without fertilizing the subsoil increases root growth only slightly. Subsoil that was chiseled and fertilized maintained a higher porosity for over 2 years. The reason for the difference is probably the presence of additional organic matter (roots and microbes) in the fertilized subsoil. The subsoiled areas generally contained more moisture than the untreated plots, pointing to less runoff and erosion and to a greater water supply for the crops. Yield increases from subsoil fertilization have been substantial in many cases, but not consistent. It is assumed that benefits from this practice will increase as it is repeated on the same area.