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Organic & Integrated Tree Fruit Production

Tuesday, January 23, 2018

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10338. Morrow, L.. 1992. Chloride fertilizers.. Growers Guide, Feb. 1992, p.A6.
Chloride is provided when KCl fertilizers are used. It affects photosynthesis, enzyme activation, cation transport, stomatal activities and other processes. In soil, Cl inhibits the conversion of ammonium to nitrate. This maintains a lower pH near the root. Cl increases the number of non-pathogenic organisms in the rhizosphere. Cl competes with nitrate for plant uptake, and reduces plant nitrate levels, which can also reduce certain plant diseases. Take-all, tanspot, stripe rust, septoria, leaf rust, and common root rot have all bee suppressed by chloride.

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.

1292. Chaudhary, T.H.. 1976. The effect of nitrogen source and 2-chloro-6-(trichloromethyl) pyridine (N-Serve) on the nitrogen and sulfur nutrition of wheat.. Ph.D. Thesis, Dept. of Agronomy and Soils, Washington State Univ., Pullman, WA.
The effects of urea applications with and without the product N-serve were examined. N-serve considerably reduced the loss of NH4+-N to organic transformations, and resulted in much higher amounts that were available to plants. Some problem of N toxicity resulted, but this was presumed to also be related to a lack of sulfur. T: Many. e.g.:Changes in the organic N content of the soil and N uptake by plants. Amounts of NH4+-N and NO3--N in the soil in April and August. Dry-matter yields and percentage uptake of N and S.

2569. Henninger, N.M. and J.M. Bollag. 1976. Effects of chemicals used as nitrification inhibitiors on the denitrification process.. Canadian J. Microbiology 22:668-672.
Several chemicals used as nitrification inhibitors were tested to determine their effect on denitrification by a Pseudomonas sp. and in soil. The nitrification inhibitors had little effect on the denitrifying activity in soil under anaerobic conditions, but did inhibit denitrification by organisms in pure culture.

3356. Jain, J.M., G. Narayanasamy, M.C. Sarkar and M.N. Datta. 1980. An evaluation of nitrification retardation property of Citrullus colosynthis.. J. Indian Soc. Soil Sci., 28(4):480-484.
An evaluation of nitrification retardation property of Citrullus colosynthis cake and its influence on yield and N uptake by wheat. Citrullus colosynthis oilcake was tested as nitrification retarder under laboratory and greenhouse conditions. The same showed NH4-N conservation when applied at the rate of 5 and 10% by weight of urea. Higher rate (20%) of the cake resulted in NO2-N accumulation leading to lower N recovery by wheat.

4694. Murray, G.A.. 1976. N-serve and its potential use in northern Idaho.. ID Agr. Expt. Sta. CIS #313.
Nitrification inhibitor; apply with anhydrous or aqua ammonia; must be incorporated; use rate of 1/2-1 qt/ac; most effective on forest-type soils, with a clay layer; not effective when used in spring; cost about $3.50/ac; not recommended for deep Palouse type soils. T: wheat yields, N rates.

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