The effect of cropping and fertiliser nitrogen rates on nitrogen balance in soil
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Fertilizer/soil N balance of cropped and fallow soil has been studied in a pot experiment carried out with grey forest soil (southern part of Moscow region) at increasing rates of15N labelled ammonium sulfate (0; 8; 16; 32 mg N/100 g of soil). The fertilizer15N balance has been shown to depend upon its application rate and the presence of growing plants. Fertilizer N uptake efficiency was maximum (72.5%) and gaseous losses-minimum (12.5%) at the application rate of 16 mg N/100 g of soil. Fertilizer N losses from the fallow soil were 130–220% versus those from the cropped soil. At the application of fertilizer N the plant uptake of soil N was 170–240% and the amount of soil N as N−NH4 exchangeable + N−NO3 in fallow was 350–440% as compared to the control treatment without nitrogen (PK).
After cropping without or with N fertilizer application at the rates of 8 and 32 mg N/100 g of soil, a positive nitrogen balance has been found which is likely due to nonsymbiotic (associative) N-fixation. It has been shown that biologically fixed nitrogen contributes to plant nutrition.
Key wordsGrey forest soil Nitrogen balance Pot experiment Ryegrass
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- 1.App A A, Watanabe I, Alexander M, Ventura W, Daez C, Santiago T and De Datta S K 1980 Nonsymbiotic nitrogen fixation associated with rice in flooded soils. Soil Sci. 130, 283–289.Google Scholar
- 2.Broadbent F E 1965 Effect of fertilizer nitrogen on the release of soil nitrogen. Soil Sci. Soc. Am. Proc. 29, 692–696.Google Scholar
- 3.Berestetskii O A and Vasjuk L F 1983 Nitrogen-fixing activity in rhizosphere and on the roots of nonlegume plants. Izv. Akad. Nauk SSSR. Ser. Biol. 1, 44–50.Google Scholar
- 4.Dart P J and Wani S P 1982 Non-symbiotic nitrogen fixation and soil fertility.In Nonsymbiotic nitrogen fixation and organic matter in the tropics. Symposia papers I Proc. 12th International congress of Soil Science. New Delhi, India pp 3–27.Google Scholar
- 5.De-Polli H, Matsui E, Döbereiner J and Salati E 1977 Confirmation of nitrogen fixation in two tropical grasses by15N2 incorporation. Soil Biol. and Biochem. 9, 119–123.Google Scholar
- 6.Giller K E, Day J M, Dart P J and Wani S P 1984 A method for measuring the transfer of fixed nitrogen from free living bacteria to higher plants using15N2. J. Microbiological Methods 2, 307–316.Google Scholar
- 7.Kalininskaya T A, Miller Yu M and Belov Yu M 1979 The study of availability of nitrogen fixed from the air by nitrogen-fixing micro-organisms for riceIn Cycling and Balance of Nitrogen in the Systems ‘Soil-Fertilizer-Plant-Water’. Nauka, Moscow, pp 44–49.Google Scholar
- 8.Kudeyarov V N 1969 Colorimetric determination of nitrates in soils by reduction to ammonia. Agrochimiya 1, 102–106.Google Scholar
- 9.Kudeyarov V N 1972 To the method of determination of total nitrogen in soils and plants. Agrochimiya 11, 121–125.Google Scholar
- 10.Kudeyarov V N and Egorova E F 1974 Preparative technique for mass-spectrometry determiantion of various forms of nitrogen in soil. Agrochimiya 11, 129–132.Google Scholar
- 11.Ruschel A P, Henis Y and Salati E 1975 Nitrogen-15 tracing on N-fixation with soilgrown sugar-cane seedlings. Soil Biol. Bioch. 7, 181–182.Google Scholar
- 12.Sirota L B 1973 The effect of mineral N fertilizers on the soil N use by plants.In Nitrogen in the Agriculture of Nonchernozem Zone. Kolos, Leningrad pp 143–181.Google Scholar
- 13.Sirota L B 1982 Nonsymbiotic N-fixation in the rhizosphere of N-fertilized plants.In Ecological Effects of Agrochemical (Fertilizer) Application. Abstracts of the All-Union Workshop on the UNESCO Program ‘Man and the Biosphere’, Project 9a, ONTI NCBI Pushchino pp 37–38.Google Scholar
- 14.Smirnov P M 1977 The problem of nitrogen in agriculture and results of studies with15N. Agrochimiya 1, 3–25.Google Scholar
- 15.Umarov M M 1981 Nonsymbiotic N-fixation in the rhizosphere and phyllosphere and its significance for the N balance in soil. Abstracts of VIth Delegate Congress of the All-Union Society of Soil Scientists, 2, Tbilisi p 171.Google Scholar
- 16.Umarov M M 1982 Nonsymbiotic N-fixation in phytoplane and its role in the N balance in soil.In Ecological Effects of Agrochemical (Fertilizer) Application. Abstracts of the All-Union Workshop on the UNESCO Program ‘Man and the Biosphere’, Project 9a ONTI NCBI, Pushchino p 42.Google Scholar
- 17.Varyushkina N M and Nikiforova M V 1982 Mineral fertilizer nitrogen transformation under the annual application of mineral fertilizers in sod-podsol soils. Agrochimiya 7, 11–16.Google Scholar
- 18.Yoshida T and Yoneyama T 1980 Atmospheric dinitrogen fixation in the flooded rice rhizosphere as determined by the N-15 isotope technique. Soil Sci. Plant. Nutr. 26, 551–559.Google Scholar