Relationship between potassium and nitrate contents in forage crops
1997
Poulik, Z. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech republic))
The ralationship between potassium and nitrate contents in herbage of perennial forage crops on arable land and grassland was studied by correlation and regression analyses, along with the relationship between potassium content and dry matter production of these crops. Problems were solved in three-year exact field trials with alfalfa, red clover, Italian ryegrass or grassland consisting of 30 % clover crops (red clover, white clover) and 70 % grasses (meadow fescue, red fescue, smooth-stalked meadow grass, timothy, ryegrass). The relationship between potassium and nitrate contents was much dependent of forage species, year and relevant harvest (cut). In alfalfa a strong positive correlation was found between potassium and nitrates in most of the cuts. In red clover and Italian ryegrass this relationship was free. In case of meadow fodder positive carrelation coefficients for relationship between potassium and nitrate contents were found in the second cut of the first time replication
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