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Studies on Azotobacter and Nitrifying Organisms in Relation to Various Fertilizer Treatments in Soils under Citrus Culture Conditions
Author(s) -
Winnik M.,
Goldberg Miriam
Publication year - 1940
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/sssaj1940.036159950004000c0065x
Subject(s) - azotobacter , citation , fertilizer , relation (database) , soil water , mathematics , library science , environmental science , biology , agronomy , computer science , soil science , genetics , bacteria , database
M. WlNNIK AND MlRIAM GOLDBERG r I ^HE purpose of the work was to study the activity Jof Azotobacter and of nitrifying organisms in citrus orchard soils under various treatments including comparisons of various forms of mineral nitrogen (NH4)2SO4, Ca(NO3)2, NaNO3 used alone or with added phosphorus and potassium and green manure. The investigations were performed on soils from carefully controlled lysimeter experiments with citrus trees. The experiment was started on 10 lysimeters in 1926 for the study of citrus fertilization problems. Each lysimeter is a large cylindrical Hank, 1-2 m deep with a surface area of about 2 sq.m. All tanks were filled with the same kind of soil, a red loamy sand, poor in organic matter and deficient in the ordinary plant nutrients, typical of soils used for citrus culture. A young budded orange tree planted in each lysimeter in the spring of 1926 has since developed into a fruitbearing tree, from which nine crops have been harvested. During the first 3 years of the experiment, lupine was grown as green manure in all lysimeters, except two, left as controls. Since the end of the 3-years' period, green manure has been continued in four lysimeters only. (To each of these four, during the 9 years of experiment, was added a total of 95 kgm of green organic matter, which is equivalent to an addition of about 300 grams of nitrogen.) The application of mineral nitrogen in 'Contribution from Mikneh-Israel Experiment Station, Palestine. Published originally in Trans. Third Com. Int. Soc. Soil Sci., A:i5i-i6o. 1939. Director and Assistant, respectively.