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^: 2493 2015 5
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^: .., 2015; N 5. - . 25-28
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^: , 491,4 . - . 2009-2014 . - . . - Cs-137 559-867 /2, - 10-15 . ( 0, 90, 120 /), - (60 /), (90, 120, 150, 180 /). : , - 2 ( - 1- , 2- - 2- ), 1 1- . , - . , - . - 1- 1,18 /, 2- - 0,55 /. - 1- 6,23 /, 2- - 3,16 /. - 20% 1- 15% 2- -. (7,31 /) N120P60K180. - . , 1- , - . N60 N45K45.

aref2 Research was conducted in Bryansk region where 491.4 thousand ha of forage lands had undergone radioactive pollution. In 2009-2014 effectiveness of fertilizer systems and ways of soil treatment for having stable yields of hay from long-term herbs of inundated forage lands was studied. Soil of the experiment site is alluvial sod-podzolic and sandy. Density of pollution of the experimental site Cs-137 was 559-867 kBq/sq.m, duration of flooding in spring - 10-15 days. Ammonium nitrate was ap-plied (dozes 0, 90, 120 kg/ha), along with the simple granulated superphosphate (60 kg/ha), potassium chloride (90, 120, 150, 180 kg/ha). Fertilizers were applied annually: nitric, potash - in two steps (a half of a designated dose - under the first hay cut, the second one - under the second hay cut), phos-phoric of a full dose once under the first hay cut. The surface tillage was carried out by disk harrows, root one - by a plow. It was found that natural fertility of soils doesn't allow yields of hay of long-term herbs to be big. Average for years of the research productivity of hay of the first cutwas 1.18 t/ha, of the second - 0.55 t/ha.Use of mineral fertilizers on natural herbages increases productivity of hay of the first cut to 6.23 t/ha and to 3.16 t/ha - of the second. Agrotechnicaland agrochemical actions when sowingthelong-term herbs increased the potential of haymakings productivityby20% in the first and by15% in the second hay cuts. The biggest hay yields (7.31 t/ha) were obtained when processing the soil with a usual plow and use of mineral fertilizers in N120P60K180 dose. Payback of mineral fertil-izers by increase of the hay yield from long-term herbs was higher during surface or root improvement of meadows. It was found that during root improvement the greatest payback of the increase of hay yield of the first cut requires less mineral fertilizers, than during the surface improvement. The highest payback was noted at application of N60 or N45K45.

^TRN: 1542890
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