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LONG-TERM EFFECT OF MINERAL FERTILIZERS ON SOIL POTASSIUM DYNAMICS IN A SODDY PODZOLIC SOIL

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LONG-TERM EFFECT OF MINERAL FERTILIZERS ON SOIL POTASSIUM DYNAMICS IN A SODDY PODZOLIC SOIL Minerālā mēslojuma ilgtermiħa ietekme uz augsnes kāliju velēnu podzolētajā augsnē Livija ZARINA- Institute of
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LONG-TERM EFFECT OF MINERAL FERTILIZERS ON SOIL POTASSIUM DYNAMICS IN A SODDY PODZOLIC SOIL Minerālā mēslojuma ilgtermiħa ietekme uz augsnes kāliju velēnu podzolētajā augsnē Livija ZARINA- Institute of Agricultural Resources and Economics e-pasts: Liga ZARINA- University of Latvia, Faculty of Geography and Earth Sciences e-pasts: CONTENT Soil, clay and potassium Fertilization and processes in soils Methodology and conditions Results and diskussion Conclusions Soil, clay and potassium The most productive soils of Latvia have been formed on clayey parent materials enriched with carbonates (2-20 %), such as moraines, hydrogenic deposits, alluvial and deluvial drifts. Podzolic soils (PS PS) are the most widespread in Latvia - approximately 50 % of the total land area including arable land. PS have developed on diverse parent materials, most often on coarse textured parent materials that once were calcareous but now at a depth above 60 cm carbonates have been weathered and leached out. Source: Karlis Bambergs, Rainis Skujans, Henrihs Mezals, LUA Soil, clay and potassium Crystalline hydrated alumosilicate with cage-like structure Burlakovs et all, 2014 Name Clay Silt Very fine sand Fine sand Medium sand Coarse sand Very coarse sand Gravel Rock Particle Diameter below mm to 0.05 mm 0.05 to 0.10 mm 0.10 to 0.25 mm 0.25 to 0.5 mm 0.5 to 1.0 mm 1.0 to 2.0 mm 2.0 to 75.0 mm greater than 75.0 mm (~2 ) Soil, clay and potassium comprising 2.6% of the Earth's crust; is the 7-th most abundant element and, is the 4-th most abundant mineral plant nutrient. 3000 and kg K ha -1 in the upper 20 cm of soils, more than 98% is bound up in the minerals while less than 2% is found in organically bound is available to crops. Soil, clay and potassium «Clay is the strength of Latvia's soil». Potasium, hectare % Group 1995 (VZD+Ražība) 2012 (SPPS) Very low and low Average High and very high 30 14 Fertilization and processes in soils Incorporation of fertilizers: is increasing yield, leaving influence on soil properties. Potassium is closely related to N nutrition (Kayser & Isselstein, 2005). Unfertilized Location (latitude; longitude; altitude ) 2 NPK N 66 P 90 K o 19'N, 25 o 20'E, 117 m A 5900 m 2. Stable manure 1.Barley-potato potato-barley; 2. Barley-clover clover/grass grass-rye rye-potato; 3.Barley-clover/ clover/grass grass-barley barley-rye rye-barley barley-potato potato; 4. Barley-clover clover/grass grass-potato; 5.Barley-clover/ clover/grass grass-clover clover/grass grass-rye rye-barley barley-potato St.manure+NPK Soil soddy podzolic loam in the year of establishment (1958 ): - ph KCl (LVS ISO 10390) - SOM 2.1% (Tyurin s method) - P 2 O mg kg -1 (Egner- Riehm s) - K 2 O mg kg -1 (Egner- Riehm s) Mineral fertilizers used were: ammonium salpeter (N33) single superphosphate (P18) potassium chloride (K60) RESULTS Spring barley spring barley-potato Spring barley clover/grasses potato RESULTS barley clover/grasses spring barley spring barley barley winter rye spring barley potato barley clover/grasses clover/grasses winter rye spring barley winter rye spring barley potato LU 73.zinātniskā konference RESULTS spring barley clover/grasses winter rye potato. LU 73.zinātniskā konference DISCUSSIONS The clay loam soils are most suitable for maintaining adequate soil K exchangeable where no K fertilizer are made (Serrano et.al. 2014) YES Potassium is closely related to N nutrition YES 1. The level of available K in sod podzolic soil is relative stable, downstream fertilizer background 2. Because the capacity of a soil to supply K to crops over an extended period of time is fundamentally dependent upon the quantity and the type of clay (secondary minerals), there is a need for developing appropriate studies. Data from long term investigations field is a good base for the start-up. Liga
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