Productive and ecological effects of increased mineral fertilizer rates in cereal crop rotations on light soil
1999
Sebzda, J. | Parylak, D. (Akademia Rolnicza, Wroclaw (Poland). Katedra Ogolnej Uprawy Roli i Roslin)
A static field experiment was conducted to study the effects of winter rye growing in the 25th, 26th and 27th year in 2 crop rotations with 100 percent of cereals (rye and stubble crop - spring barley - oats; rye and catch - rye) using 2 fertilizer rates on its yielding and on selected soil properties. Rye as a control treatment was grown in a 4-crop rotation: potato - oats - field pea - rye and catch, with a conventional fertilizer rate. Rye yielded 17 and 39 percent less in a 3-crop rotation and monoculture, respectively as compared to the control. Reduction in yield was attributed to a decreased weight of 1000 grains. Long-term growing of the cereals alone, reduced the content of organic carbon in soil, bat the same time increased the percentage of the labile fraction of fulvic acids. Doubled fertilizer rates applied during many years, has not been effective regenerative factor, in particular in multi-species rotation of cereals (markedly reduced rye yield and humins content of soil)
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