WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, April 22, 2018

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1033. Bracken, A.. no date. Dry farming.. USU (Logan) Course notes for Agronomy 116.
Describes climatic factors that cause dry lands, the dryland regions of the world, soils of dry areas, organic matter and N relations. Dry farms in northern UT have lost 16% of soil N and 22% of SOM from first foot of soil, after 44 years of cropping.

6793. Thatcher, R.W.. 1912. The nitrogen and humus problem in dry farming.. WA Agr. Expt. Sta. Bull. #105.
Problems in maintaining OM because of low moisture are discussed. Dry-farming reduces OM and deficiency in humus injures soil in 3 ways: 1) reducing fertility; 2) decreased water holding capacity; 3) decreasing friability. Soils from cultivated and virgin soils were tested for OM fractions. Data on OM, humus, and N are presented. OM values of 4-8% are common, losses of 430 lb of N per crop year acre are shown. Recommendations are: straw incorporation, rotations, green manuring, and animal manuring. T: Test results of OM, humus, and N from: hill top, south slope, north slope, and bottom land near Pullman.

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