+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Distribution and nitrification of anhydrous ammonia in a nicollet sandy clay loam

, : Distribution and nitrification of anhydrous ammonia in a nicollet sandy clay loam. Soil Sci Soc Amer Proc 22(5): 402-405

A roughly cylindrical distribution of NH3 centered at the knife openings was found when anhydrous ammonia was applied with a field applicator at a depth of 4 inches, by sampling an 8 by 8 by 2-inch cross section perpendicular to the applicator row. NH4-N and pH were determined on each 1-inch square subsample. NH4-N decreased from a maximum concentration of 1.300 to 2.000 ppm (pH 9.5) at the center to less than 200 ppm (pH 8) in the area about 1.5 inches away from the center of the retention zone. After 2 weeks, maximum concentration of NH4-N was about 800 ppm (pH 8.8) in the center, decreasing to less than 100 ppm (pH 7.0) in the area about 2.5 inches away from the center of the retention zone. Nitrification initially proceeded more rapidly in the outside 2 inches of the retention zone where the concentration of NH4-N was less than 400 ppm. Later in the original ammonia retention zone, nitrification appeared to be limited by low pH and nitrate concentration; at the end of 4 weeks the pH had decreased to a value of 5 to 5.5 and NO3-N had increased until 200 to 300 ppm were present. Ammonia applied in Nov., just prior to freezing, showed little nitrification by March. Rapid nitrification began in mid-April when soil temperatures rose above 40[degree] F. Approximately 8 weeks were required to completely nitrify the ammonia.


Other references

Medina Medina, M.J.; D.A.itua Solano, M.; Marina Diez, E., 1965: On the existence of zinc osmium-iodide tetroxide complex-reducing cells in human vaginal epithelium. Toko-Ginecologia Practica 24(233): 593-602

Rao, M.S.; Reddy, N.S.; Rao, G.V.; Rao, K.R.S.S., 2005: Studies on the extraction and characterization of thermostable alpha -amylase from pericarp of Borassus indica. Thermostable alpha -amylase was extracted and characterized from the fruit pericarp of Borassus indica obtained from Nambur, Guntur District, Andhra Pradesh, India. Analysis of the influence of various physicochemical parameters on the extracted e...

Fischer, Thomas,, 1996: Coast silk tassel: Garrya elliptica. The coast silk tassel (Garrya elliptica) is reviewed. A description of this evergreen shrub's leaves, height, flowers, bloom period, natural range, hardiness, cultivars, and companions is included.

Paolisso, M., 2002: Blue crabs and controversy on the Chesapeake Bay: a cultural model for understanding watermen's reasoning about blue crab management. Commercial fishers of the Chesapeake Bay, in the USA, known throughout the region as watermen, have depended for centuries on the bay's natural resources to support their families and communities. Recently, yield and population indicators hav...

Maimon, N.; Salz, L.; Shershevsky, Y.; Matveychuk, A.; Guber, A.; Shitrit, D., 2013: Sarcoidosis-associated pulmonary hypertension in patients with near-normal lung function. Tertiary care medical centre in Israel. Pulmonary hypertension (PH) is a predictor of poor outcome in patients with sarcoidosis. Early diagnosis may improve outcome. To determine factors that might contribute to the early diagnosis of PH in sarcoi...

Protasov, AA.; Zdanovsky, B., 2002: On determination of effect of thermal and nuclear power stations on hydroecosystems with the help of expert assessments. Gidrobiologicheskii Zhurnal, 381: 95-105

Scheibner, J.; Tauber, G.; Fuchs, M.; Stange, E.F., 1994: Chenodeoxycholate synthesis is inversely correlated with the deoxycholate input in healthy humans. Gastroenterology 106(4 SUPPL ): A977

Hartman A.D., 1978: Lipo protein lipase activity in adipose tissues of obese and lean zucker rats. Physiologist 21(4): 51

E.T.bbakh, A.E.; E.H.bbal, M.S.; E.S.yed, S.A.; Thabet, E.M.A., 1982: Effect of gamma rays irradiation on growth and yield of sunflower plants. Seeds of sunflower cv. Giza 1 were irradiated with 0, 2.5, 5, 10 or 20 kr using 60Co at doses of 1.2 X 102 kr/h prior to sowing. Plant ht., seed protein content, and ester and iodine values of seed oils decreased at higher doses of radiation. Stem...

L.R.Prewitt, D.R.Jacobson, R.W.Hemken, 1973: Amino acid absorption by portal-jugular venous difference in sheep fed two qualitiesof alfalfa hay. Alfalfa of the same plot harvested during the bud stage of maturity (early cut) and late cut harvested 2 wk later during bloom stage was fed to three mature crossbred wethers. Net absorption of amino acids was determined by portal minus jugular co...