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Organic & Integrated Tree Fruit Production

Sunday, December 16, 2018

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Search results on 12/16/18

442. Anon.. June 1990. New way to reduce N losses.. The Furrow, p. 15.
Arvin Mosier, USDA-ARS at Fort Collins, CO, has developed a new nitrification inhibitor. It involves applying shellac-coated calcium carbonate crystals to the soil. The crystals react with soil moisture to form acetylene gas, which slows nitrification, and the action is a slow-release one that lasts several weeks. In tests using 20 lb/ac of crystals, the value of the nitrogen saved was 10 times the cost of treatment. A commercial process still needs to be developed. // Excessive N fertilizer can reduce the vitamin C content of some green vegetables (chard, green beans) by as much as 50%. It is mostly a dilution effect from accelerated growth.

915. Boawn, L.C., C.E. Nelson, F.G. Viets, and C.L. Crawford. 1960. Nitrogen carrier and nitrogen rate influence on soil properties and nutrient uptake by crops.. WA Agr. Expt. Sta. Bulletin 614.
Irrigated soils near Prosser. Native soil. Soil pH dropped from 7.4 to 6.0 (0-8") with ammonium sulfate at 160 N/ac. Effect of ammonium nitrate was less, while calcium nitrate had no effect on pH. Fertilizer N recovery was 75-85%. N application increased Mn uptake, but no trends for other elements.

3163. Kouril, R.. 1988. Green manures as dynamic accumulators.. J. of Sustainable Agriculture (CA) 1:23-24.
The author describes various plants that appear to preferentially accumulate certain nutrient elements. By choosing these plants as green manures, fertility levels can potentially be increased. Typically, these plants thrive in areas with high amounts of the nutrient, but they can sometime make them more available. Buckwheat and mustards are considered phosphate accumulators, while oak leaves are calcium accumulators. A comprehensive listing of plants and their nutrient content is provided in the author's book "Designing and Maintaining Your Edible Landscape Naturally."

4302. McDole, R.E., R.W. Harder, and J.P. Jones. 1978. North daho fertilizer guide - Alfalfa.. ID Agr. Expt. Sta. CIS #447.
Describes crop needs for P,K,S and micronutrients.

5396. Jackson, G.D. and J.R. Sims. 1977. Comprehensive nitrogen fertilizer management model for winter wheat.. Agron. J. 69:373-377.

6729. Stewart, R.. 1910. The nitrogen and humus problem in dryland farming.. Utah Ag. Exp. Sta. Bull. #109.
A brief review of literature describes the problem. For example, when summer fallow was practiced, six times as much N was lost by other processes as would have been removed by plant food (Snyder, Minn. Exp. Sta. Bulls 30, 41, 53, 65, 70). The author surveyed 10 farms and concluded: wheat crops did not decrease N or humus in the surface foot of soil. The second foot of soil contained less N and humus. Alfalfa caused a decrease in N and humus over adjacent virgin soil. The author hypothesizes that N was removed from lower soil depths and that C was generated from grain crop residue.

9284. Bracken, A.F. and G. Stewart. 1930. A quarter century of dry farm eExperiments at Nephi, Utah.. Utah Agr. Expt. Sta. Bulletin 222, Logan, UT..
Dry farming began in Boxelder County in 1863 and has now extended to all parts of the state where precipitation and topography permit favorable development. Alternate cropping with fall or early spring planting is the general practice. On page 41, there is a summary of results covering the following subjects: weather, data, treatment of land before plowing, plowing, treatment of summer fallow seeding experiments, cropping experiments, cereal varieties, fertility experiments, and rotations.

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