Effects of crop rotation and fertilization on readly available potassium content
2008
Seremesic, S., Poljoprivredni fakultet, Novi Sad (Serbia) | Milosev, D., Poljoprivredni fakultet, Novi Sad (Serbia) | Dolijanovic, Z., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Kovacevic, D., Poljoprivredni fakultet, Beograd - Zemun (Serbia)
The objective of this study was to investigate effects of rotation and fertilization on readily available potassium in soil at long term experiment Plodoredi at Rimski Sancevi near Novi Sad, Serbia. The study treatments were: fertilized and unfertilized three-year crop rotation (wheat-maize-soybean), fertilized and unfertilized two-year crop rotation (wheat-maize). The unfertlized plots were established 1946/47, while the fertilized one was set up in 1965/1970. Since 1986, on fertilized plots mineral fertilizers with phosphorus, potassium and manure were not applied because of a high P and K content. Nitrogen is used every year on fertilized plots at 120 kg/ha for maize and 100 kg/ha for wheat. The result suggests that long term application of fertilizers have major effect on potassium content in both years and soil layers. Differences among two- and three-year rotation in available potassium content were statistically significant only in the 30-60 cm layer. Low content of potassium could contribute to lower yield formation, particularly in dry years, however, our study showed that chernozem has high potential for potassium release from clay mineral. On the other hand as a result of the long-term fertilization considerable accumulation of potassium occurred at fertilized plots.
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