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Type of publication: research article
Type of publication (PDB): Straipsnis recenzuojamoje užsienio tarptautinės konferencijos medžiagoje / Article in peer-reviewed foreign international conference proceedings (P1d)
Field of Science: Agronomija / Agronomy (A001)
Author(s): Vaišvila, Zigmas;Arbačiauskas, Jonas;Staugaitis, Gediminas
Title: Nitrogen Nutrition Diagnostics for Agricultural Crops in Lithuania
Is part of: Contributed Papers: 3rd International Nitrogen Conference, October 12-26, 2004, Nanjing, China Monmouth Junction, NJ : Science Press USA, 2005
Extent: p. 254-258
Date: 2005
Keywords: Mineral nitrogen;Agricultural crops yield;Nitrate leaching
ISBN: 1933100109
Abstract: We have validated the significance of mineral nitrogen present in the soil for diagnosing the agricultural crops need for fertilization as well as its effects on the environment. This was done by conducting the field and laboratory experiments under Lithuanian agro-climatic conditions. The yield of agricultural crops most resiliently correlated with mineral nitrogen, somewhat less with nitrate nitrogen and the least with ammonia nitrogen. Yield of grains correlated the best with nitrogen amount measured in spring in 0-60 cm soil layer. Following the mineral nitrogen concentration in soil, the soils in Lithuania can be grouped into five groups: I - less than 5 mg-kg"1 Nmjn in soil, very low; II - 5.1 - 10 mg-kg"1 Nmin in soil, low; rn -10.1 - 15 mg-kg"1 Nmin in soil, medium; IV- 15.1 -20 ing-kg^N,™, in soil, high; V- more than 20 mg-kg"1 N,™ in soil, very high. The crop yield and the efficacy of nitrogen fertilizer depends on the amount of the mineral nitrogen in soil. When it increases, the plant yield increases and the mineral fertilizers efficacy decreases. The crop should be fertilized additionally when total nitrogen in dry matter is less than 35 gkg"', N: P ratio less than 9.0, K: N ratio more than 0.90. Fertilization only with big rates of nitrogen increased the nitrates concentration in lysimeter water. This concentration was less, when nitrogen fertilization was applied on the background of phosphorus and potassium fertilization
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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