An attempt to distinguish sunflower, maize and ryegrass response to soil pH from the response to Ca2+ under liming conditions
1997
Taneva, Maria (N.Poushkarov Institute of Soil Science and Agroecology, Sofia (Bulgaria))
In a previous work on the response of lucerne to alkaline and alkaline earth carbonates, CaCl2 and Ca(NO3)2, it has been established that cations and anions of the ameliorating agents have their separate influence on the yield. It seems that the mechanism of such influence is connected to the physical environment of roots rather to the chemical reactions of the metabolism. Three plant species were chosen for this investigation. They are more tolerant to soil acidity then the lucerne and their tolerance to acid conditions increases in the order mentioned above. They were grown on two cinnamonic, pseudopodzols and on two grey forest soils. The soils were treated with CaCO3 or with equivalent amount of CaSO4. To all variations were applied NPK-fertilizers as a background. After the harvest of the plants their overground parts and roots were weighted. The content of Ca, Mg and K in the plant tissues was evaluated. According to the counted ISD, it becomes obvious that liming has a slight favourable effect on sunflower yield, and partly on the maize yield. Plastering has not a proved influence on the yield. The comparison between the relative content of Ca in the different variations showed that the differences between liming and plastering are not drastic, as they were observed when the soil has been treated with CaCl2 or Ca(NO3)2. So it seems that SO4 creates more favourable conditions for roots development, if compared to Cl and NO3
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